Which of the following will change the color of a paragraph’s text to blue when a user hovers over it, and reset it back to black when the user hovers out?
Answer
Correct Answer:
onmouseover= paragraph..
p onmouseover=
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162. The following are sample codes on how to merge properties of two JavaScript objects dynamically:
var objl = { food: var obj2 = { animal: "dog"}
function MergeRecursive(objl,obj2){
var obj3 = {};
for (var attrname in objl) { obj3[attrname]= objl[attrname]; }
for (var attrname in obj2) { obj3[attrname]= obj2[attrname]; }
return obj3;
}
Function MergeRecursive(objl, obj2){
for (var p in obj2) {
try {
// Property in destination object set; update its value,
if ( obj2[p].constructor==Object ) {
objl[p] = MergeRecursive(objl[p], obj2[p]);
} else {
objl[p] = obj2[p];
}
}catch(e) {
// Property in destination object not set; create it and set its value.
objl[p] = obj2[p];
}
}
return objl;
Object.extend = function(destination., source) {
for (var property in source)
destination[property] = source[property];
return destination;
}
objl.extend(obj2)
Answer
Correct Answer:
function MergeRecursive(objl,obj2){
var obj3 = {};
for (var attrname in objl) { obj3[attrname]= objl[attrname]; }
for (var attrname in obj2) { obj3[attrname]= obj2[attrname]; }
return obj3;
}
Function MergeRecursive(objl, obj2){
for (var p in obj2) {
try {
// Property in destination object set; update its value,
if ( obj2[p].constructor==Object ) {
objl[p] = MergeRecursive(objl[p], obj2[p]);
} else {
objl[p] = obj2[p];
}
}catch(e) {
// Property in destination object not set; create it and set its value.
objl[p] = obj2[p];
}
}
return objl;
Object.extend = function(destination., source) {
for (var property in source)
destination[property] = source[property];
return destination;
}
objl.extend(obj2)
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163. What is the following code output?
(function() {
var objl = new Object({name: "Jacob"});
var obj2 = new Object({name: "Alex"});
console.log(objl == obj2);
console.log(objl === obj2);
Answer
Correct Answer:
None of the above
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164. Which of the following functions determines whether the beginning of the paraml instance matches the param2?
function (paraml, param2) {
return paraml.indexOf(param2) == 0;
};
function (paramlj param2) {
return param2.indexOf(paraml) == 0;
};
function (paraml, param2) {
return paraml.startsWith(param2)
};
function (paraml, param2) {
return param2.startsWith(paraml)
};
Answer
Correct Answer:
function (paraml, param2) {
return param2.startsWith(paraml)
};
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165. A form contains two fields named idl and id2. How can you copy the value of the id2 field to idl?
document.forms[0].idl.value=document.forms[0].id2.value
document.forms[0].id2.value=document.forms[0].idl.value
document.idl.value=document.id2.value
document.id2.value=document.idl.value
Answer
Correct Answer:
document.forms[0].idl.value=document.forms[0].id2.value
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166.
What will happen if this single code is executed? 'use strict'; foo = true;
Global variable will be created
ReferenceError thrown
Block scoped variable will be created
Nothing happens
Answer
Correct Answer:
Global variable will be created
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167.
For the following html element, which is the correct method to change the font size to 25px using javascript?
< p id = "foo">Lorem Ipsum</ p >
document.getElementById("foo").setFontSize = "25px";
document.getElementById("foo").style.fontSize = "25px";
document.getElementById("foo").fontSize = "25px";
document.getElementById("foo").style("font-size = 25px");
Answer
Correct Answer:
document.getElementById("foo").style.fontSize = "25px";
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168.
Which of the following code is correct for validating date values?
var d = Date.parse('foo'); if (isNaN(d)==false) { alert(new Date(d)); } else { alert('Invalid date'); }
var d = new Date('foo'); if (d instanceof Date && isFinite(d)) { alert(d); } else { alert('Invalid date'); }
Date.prototype.valid = function() { return isFinite(this); } var d = new Date('foo'); if (d.valid()) { alert(d); } else { alert('Invalid date');
All of the above.
Answer
Correct Answer:
var d = Date.parse('foo'); if (isNaN(d)==false) { alert(new Date(d)); } else { alert('Invalid date'); } var d = new Date('foo'); if (d instanceof Date && isFinite(d)) { alert(d); } else { alert('Invalid date'); }
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169.
Cookies are a plain text data record with the following variable-length fields?
Secure
Domain
Package
Media
Navigator
Answer
Correct Answer:
Secure Domain
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170.
What is the result of console.log? var xyz = true; if (xyz) { let res = 42; } console.log(res);
true
42
false
ReferenceError
undefined
Answer
Correct Answer:
ReferenceError
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171.
Which types of image maps can be used with JavaScript?
Server-side image maps
Client-side image maps
Server-side image maps and Client-side image maps
None of the above
Answer
Correct Answer:
Client-side image maps
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172.
Which of the following represents when a String object splits a String object into an array of strings by separating the string into substrings?
slice()
split()
replace()
search()
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173.
Evaluate the following expression: ~-(2 + "2")
undefined
SyntaxError
21
-22
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174.
Which of the following is used in JavaScript to insert special characters?
&
+
-
%
None of the above
Answer
Correct Answer:
None of the above
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175.
Select all correct statements about Object.prototype
Property attributes are writable
Property attributes are enumerable
Property attributes are configurable
Property attributes are readable
Answer
Correct Answer:
Property attributes are readable
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176.
Is it possible using JavaScript, without 3rd party libraries, to select DOM elements with such selector: #question > option
No. It requires jQuery
Yes
No. It requires SizzleJs
This is CSS selector and has nothing with JavaScript
Answer
Correct Answer:
This is CSS selector and has nothing with JavaScript
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177.
How can you remove all of an Element’s children from the DOM?
function remove( element ) { if ( element ) element.parentNode.removeChild( element ); }
function empty( element ) { while ( element.firstChild ) remove( element.firstChild ); }
var listItems = document.getElementsByTagName('li'); remove(listItems[0]);
function empty( element ) { while ( element.firstChild ) remove(firstChild ); }
Answer
Correct Answer:
function empty( element ) { while ( element.firstChild ) remove( element.firstChild ); }
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178.
What is the value of b? let a = [1, 2, 3, 4, 5]; let b = [1, 2, ...a];
[1, 2, 3, 4, 5]
[1, 2, 1, 2, 3, 4, 5]
Some error
[1, 2]
[3, 4, 5]
Answer
Correct Answer:
[1, 2, 1, 2, 3, 4, 5]
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179.
Which example is correct of Local Scope Variable?
var b = 3; function myFunc() { return b * b; }
function myFunc() { var b = 3; return b * b; }
var a = 2; function myFunc(){ console.log(a); }
All of the above
Answer
Correct Answer:
function myFunc() { var b = 3; return b * b; }
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180.
Which event handlers can be used to create hover effect on HTML element?
onhoverstart and onhoverend
onmouseover and onmouseout
onhover and onout
mouseenter and mouseleave
Answer
Correct Answer:
onmouseover and onmouseout
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181.
Which function will return 10 when called like this: f(10);
const f = (...f) => f;
const f = (...f) => f.reduce(f => f);
function f() { return arguments; }
const f = f => f;
Answer
Correct Answer:
const f = (...f) => f.reduce(f => f); const f = f => f;
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182.
What will be the value of a? let a = 'a'; let b = 'b'; a = [a, , b] = [1, 2, 3];
TypeError
RangeError
[1, 2, 3]
SyntaxError
Answer
Correct Answer:
[1, 2, 3]
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183.
What will be returned if we call f(1);? const b = [1, 2, 3]; const f = (a, ...b) => a + b;
7
1
6
Some error
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184.
Why do web programmers use node.js?
Node.js is a client-side software system where Programmers can customize jQuery code library.
Node.js is a server-side software system where Programmers can write server-side network applications in.
Node.js is a client-side software system where Programmers use this plugin to create video playing website like Youtube without FFmpeg and FFmpegx.
Node.js is a server-side software system, programmers use Node.js to debug javascript erros automatically when a website visitor visits the website.
Answer
Correct Answer:
Node.js is a server-side software system where Programmers can write server-side network applications in.
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185.
What is the correct syntax for referring to an external script called "test.js"?
script name="test.js">
<script href="test.js">
<script src="test.js">
None of these
Answer
Correct Answer:
<script src="test.js">
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186.
What will be written in the alert box after executing the following code? ``` var a = 5; var b = 1; if(!!"false") { a = a + 5; b = 3; }; if(!!0) { a = a + 5; b = b + 2; }; alert(a+b); ```
13
20
6
None of these
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187.
What will be the output of the following code? var x = [typeof x, typeof y][1]; console.log(typeof typeof x);
string
object
array
It will raise an exception
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188.
Select the existing event handler for DOM elements.
onDrag
onClick
close
onload
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189.
What is JavaScript?
It's the same language as Java just more suitable for web scripting
It's the programming language used by only web developers
It's the programming language used by only server developers
It's the programming language used by web and server developers
It's one of the programming languages based on ECMAScript standard
Answer
Correct Answer:
It's one of the programming languages based on ECMAScript standard
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190.
What will be the value of a? let a = void function f() { let a = 1 - 2; let b = 2 - 3 + 1; if (a) { return true; } else if (b) { return false; } else { return null; } return -1; }();
false
null
-1
undefined
Answer
Correct Answer:
undefined
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191.
Which statement about Promises is not correct?
Promise may never resolve value
.catch() must be used with all Promises
It's possible to test which Promise resolves first with method from Promise object
All Promises will eventually resolve or reject
Answer
Correct Answer:
Promise may never resolve value .catch() must be used with all Promises It's possible to test which Promise resolves first with method from Promise object
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192.
What's the point of code around the variable statement: (function() { var a = true; })();
It's self-executing anonymous function
It isolates the environment not to leak variables to global space
It make code more readable
It creates anonymous function
Answer
Correct Answer:
It's self-executing anonymous function
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193.
How often will message "hey" be logged in console? setInterval(() => {console.log('hey')},1);
Every 1 milliseconds
Every 1 seconds
Every 0.01 seconds
No correct answer
Answer
Correct Answer:
Every 1 milliseconds
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194.
Select options which create object type variables:
let a = '';
let a = {};
let a = [];
let a = new String('a');
let a = null;
Answer
Correct Answer:
let a = ''; let a = {}; let a = []; let a = new String('a'); let a = null;
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195.
How many operations can be done simultationsly with JavaScript?
2
1
8
32
Limited only by RAM and CPU
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196.
What will be the value of s.size after executing this code? let s = new Set(); s.add('aa').add('bb').add('cc').add('aa').add('bb')
3
6
undefined
This is not valid JavaScript code
5
10
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197.
What is true about JavaScript language? (choose all that apply)
All objects can inherit from another object
Inherit properties by following the class chain
Can add or remove properties to individual objects or to the entire set of objects at run time
None of these
Answer
Correct Answer:
All objects can inherit from another object Can add or remove properties to individual objects or to the entire set of objects at run time
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198.
What does let mean in JavaScript?
It's used to create any variable
It's used to create local block scoped variable
It's used to create variable which overrides variables in upper scope
It creates variable which can be used anywhere in code
It's `var` upgrade to show that ES6 is used and compiler must run code in ES6 mode
Answer
Correct Answer:
It's used to create local block scoped variable
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199.
How many yield keywords can be used in function* functions?
As many as needed
1
Same amount as `return` keyword
As many as needed if followed by `return` keyword
Answer
Correct Answer:
As many as needed
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200.
What will be logged in the console? let a = { [ 'foo_' + (() => 1)() ]: 2 }; console.log(a);
TypeError
SyntaxError
{ foo_1: 2 }
ReferenceError
Answer
Correct Answer:
{ foo_1: 2 }
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201.
What's true about the document object in any environment? (choose all that apply)
It's always defined and available to use
The document object can be used to load new URL in the browser
The document object can be used to get an element from DOM
The document object has all active DOM elements in his prototype for quick access
Answer
Correct Answer:
It's always defined and available to use The document object can be used to get an element from DOM The document object has all active DOM elements in his prototype for quick access
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202.
What will be returned if we call f(3)? const f = (x, y = true) => x * y;
4
NaN
3
Some error
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203.
What is TypeError?
It's a human-friendly string with description about unexpected variable type used
It's an object with message parameter
It's instance of Error which has the name of TypeError and message property with human-friendly message
It's instance of TypeError which has some own methods to get human-friendly error message and has name of TypeError
Answer
Correct Answer:
It's instance of Error which has the name of TypeError and message property with human-friendly message
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204.
What will be the value of a? let a = -1 ? 'foo' ? null : -1 : 1;
foo
null
-1
1
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205.
What does ~ mean in bitwise operation?
OR
SPREAD
XOR
ZERO-FILL
NOT
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206.
What are valid states of the created Promise?
pending
fulfilled
initializing
rejected
Answer
Correct Answer:
pending fulfilled rejected
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207.
Which statements are true about web workers?
It's possible to spawn new workers inside a web worker
Worker's error bubble and is thrown in script which created the worker
When sending a message to worker with postMessage function connection handler is returned which can be reused for faster messaging
Worker ignores `Content-Security-Policy` header of the script which constructed the worker
Answer
Correct Answer:
It's possible to spawn new workers inside a web worker Worker's error bubble and is thrown in script which created the worker When sending a message to worker with postMessage function connection handler is returned which can be reused for faster messaging
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208.
What kind of function is function* in JavaScript? (choose all that apply)
It's not a valid code
It is a function which can return value several times
It is a function which can be paused in the middle of execution
No correct answer
Answer
Correct Answer:
It is a function which can return value several times It is a function which can be paused in the middle of execution
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209.
What is true about strict mode? (choose all that apply)
It applies to block statements
It applies to individual functions
It applies to entire script
It applies to HTML page
Answer
Correct Answer:
It applies to individual functions It applies to entire script
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210.
Select the event handlers that exist on the HTMLElement.
title
contentEditable
onmousedown
ondblclick
ondragaround
Answer
Correct Answer:
contentEditable
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211.
What will be logged in console? const data = [{a: true, b: false}, {a: false, b: true}]; let result = false; let sample; while (sample = data.pop()) { result = sample.a; } console.log(result);
ReferenceError
TypeError
true
false
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212.
What will be logged to the console? const a = new Promise(function (resolve, reject) { setTimeout(resolve, 100 * .9, '1'); }); const b = new Promise(function (resolve, reject) { setTimeout(reject, .9 * .0, '2'); }); Promise .race([a, b]) .then((value) => { console.log(value); });
undefined
Some error
1
2
a
b
Answer
Correct Answer:
Some error
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213.
How can you get the type of the variable?
using typeof operator
using getType function
Both of the above.
None of the above.
Answer
Correct Answer:
using typeof operator
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214.
How do you remove property a from this object? let a = {a:1, b:2};
a.a = null;
a.a = false;
a.a = 'undefined';
delete a.a;
remove a.a;
Answer
Correct Answer:
delete a.a;
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215.
What is the output of the following code? var foo = 123e5; var bar = 10; var foobar = foo + bar; console.log(foobar)
12300010
1230000010
123e510
133
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216.
What will be in the alert box? let a = {}; a.foo = 'bar'; let b = {a}; alert(b);
some error
{ a: { foo: 'bar' } }
{ a: null }
{ a: undefined }
[object Object]
Answer
Correct Answer:
[object Object]
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217.
What is the following code output? (function() { var obj1 = new Object({name: "Jacob"}); var obj2 = new Object({name: "Alex"}); console.log(obj1 == obj2); console.log(obj1 === obj2); }());
Jacob Alex
true false
false true
None of the above
Answer
Correct Answer:
None of the above
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218.
What are the Behavioral patterns as follows?
Template method
Chain of responsibility
Mediator
Proxy
Facade
Answer
Correct Answer:
Chain of responsibility Mediator
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219.
When formal arguments value changes, what is the output of Arguments object? function myFunc(a, b) { arguments[1] = 20; arguments[2] = 79; console.log(a + ", " + b); } myFunc(1, 2);
20, 79
20 + 79
2, 20
1, 20
99
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220.
What will be the output when the following statement code is executed? if(true){ const a=1; console.log(a); a=100; }
1
100
Uncaught TypeError
ReferenceError
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221.
Which of the following code samples creates an alert box with "false" in it?
var n = 3.2; alert(n===+n && n!==(n|0));
var n = 3; alert(n===+n && n===(n|0));
var boolValue = new Boolean("false"); alert(boolValue);
var n=3.2; alert(n % 1 === 0);
Answer
Correct Answer:
var n=3.2; alert(n % 1 === 0);
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222.
Which of the following code is self-executing anonymous function expression?
var bar = function () { console.log('This function worked!' ); };
function foo() { console.log('This function worked!'); }
(function () { console.log( 'This function invoked!' ) })();
All of the above
Answer
Correct Answer:
(function () { console.log( 'This function invoked!' ) })();
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223.
What is printed in the console? for (let i = 0; i<5; i++) { console.log(i); } console.log(i);
0 1 2 3 4
undefined
ReferenceError
SyntaxError
Answer
Correct Answer:
0 1 2 3 4
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224.
How you will do empty an array in JavaScript? var array = ['1', '2', '3', '4', '5', '6'];
while(array.length) { array.pop(); }
array.length = 0
array=[]
var anotherArray = array; array.length = 0;
while(array.length) { array.removeAll(); }
Answer
Correct Answer:
array.length = 0
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225.
Which of the following right code for Function expression?
var bar = function () { console.log( ‘This function worked!’ ); };
function foo() { console.log( ‘This function worked!’ ); }
(function () { console.log( 'This function invoked!' ) })();
All of the above
Answer
Correct Answer:
All of the above
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226.
Consider the following code output? var name = "falleyr*"; if (name == "jolly") { name += "!"; } else if (name == "falleyr**") { name += "!!"; } else { name = "!" + name; } name == "falleyr***" console.log( name);
falleyr!
jolly
!falleyr*
!falleyr*!
Answer
Correct Answer:
!falleyr*
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227.
The Error event is fired when progression has failed and it have the following Property's?
lengthComputable
loaded
bubbles
id
total
Answer
Correct Answer:
lengthComputable
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228.
The WheelEvent.deltaMode read-only property returns an unsigned long representing and the Permitted Constant values are?
DOM_DELTA_PIXEL
DOM_DELTA_X
DOM_DELTA_Y
DOM_DELTA_PAGE
DOM_DELTA_LINE
Answer
Correct Answer:
DOM_DELTA_PIXEL DOM_DELTA_PAGE DOM_DELTA_LINE
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229.
Every array method tests whether all the elements in an array passes, what are the correct statement about parameter Details? (Check all that apply)
callback : Function to test for each element
thisObject: Object to use when load callback
callback : Function to executing for each array
callback : Function to executing for each callback
thisObject : Object to use as this when executing callback
Answer
Correct Answer:
callback : Function to test for each element
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230.
The following code create Boolean objects with an initial value of false?
var myBol =new Boolean(null);
var myBol =new Boolean("");
var myBol=new Boolean(0);
var myBol =new Boolean(false);
var myBol =new Boolean(1);
Answer
Correct Answer:
var myBol =new Boolean(null);
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231.
What are the following EventTarget Methods?
target
currentTarget
EventTarget.removeEventListener()
EventTarget.addEventListener()
EventTarget.dispatchEvent()
Answer
Correct Answer:
EventTarget.removeEventListener() EventTarget.addEventListener() EventTarget.dispatchEvent()
Note: This question has more than 1 correct answers
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232.
There are several Navigator-specific methods which include the following? (check all that apply)
plugings.refresh
plugins[]
userAgent[]
taintEnabled()
Answer
Correct Answer:
plugings.refresh
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233.
XMLHttpRequest has the following properties?
XMLHttpRequest.responseText
XMLHttpRequest.responseURL
XMLHttpRequest.responseXML
XMLHttpRequest.responseTypeData
All of the above
Answer
Correct Answer:
XMLHttpRequest.responseText
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234.
Which statement is correct about null and undefined?
Undefined indicates that a variable is not defined in the scope. Null can be assigned to a variable as a representation of no value.
Both undefined and null indicate that a variable has not been assigned a value.
Null is a primitive value used when a variable has not been assigned a value. Undefined is a primitive value that represents an empty or non-existent reference.
None of these.
Answer
Correct Answer:
Undefined indicates that a variable is not defined in the scope. Null can be assigned to a variable as a representation of no value.
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235.
Which functions determine whether the beginning of the param1 instance matches the param2?
function (param1, param2) { return param1.indexOf(param2) == 0; };
function (param1, param2) { return param2.indexOf(param1) == 0; };
function (param1, param2) { return param1.startsWith(param2); };
function (param1, param2) { return param2.startsWith(param1); };
Answer
Correct Answer:
function (param1, param2) { return param1.startsWith(param2); };
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236.
Which of the following are the valid JavaScript codes to obtain the number of milliseconds since the epoch? (check all that apply)
Var timestamp = new Date() .getTime ();
Var timestamp = Number (new Date () );
Var timestamp = Date.now;
Var timestamp = new Date () .value of ();
Answer
Correct Answer:
Var timestamp = new Date() .getTime (); Var timestamp = new Date () .value of ();
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237.
The replacement string can include the following special replacement patterns?
$`
$&
$$
$'
None of the above
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238.
Javascript provides the following functions to be frequently used in animation programs? (check all that apply)
.Fadein/FadeOut
.animation()
setTimeout (function, duration)
setInterval (function, duration)
Answer
Correct Answer:
setTimeout (function, duration)
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239.
Document Properties in W3C DOM, supports all the properties available in Legacy DOM?
Implementation
documentElement
createComment( text)
createElement( tagName)
Answer
Correct Answer:
Implementation
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240.
The following global properties return a value and they have no properties/methods? (check all that apply)
Infinity
Nan
isFinite()
eval()
undefined
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241.
Which of the following will correctly check if an object is an array? (check all that apply)
Object.prototype.toString.call(arr) === '[object Array]'
Array.isArray(arr)
Object.isArray(arr)
None of these
Answer
Correct Answer:
Object.prototype.toString.call(arr) === '[object Array]'
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242.
what will be the output of the following code?
var flg = true;
console.log(flg + 1);
console.log(flg + “xyz”);
console.log(flg + true);
console.log(flg + false);
1
truexyz
0
2
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243.
Regular-expression anchor has the following characters?
^
$
(?!p)
(?/\b)
All of the above
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244.
What are the RegExp Properties as follows?
sourceIndex
lastCase
constructor
global
Answer
Correct Answer:
constructor
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245.
Which of the following are legal event handlers for the image object?
Onload
Onabort
Onmove
All of the above
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246.
Consider the following code output? var val = "var global"; function constructFun() { var scope = "var local"; return new Function("return val"); } constructFun()());
var global
return val
var global
Error
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247.
What will be the output of the following code?
function User(name) {
this.name = name || “Mike”;
}
var usr = new User(“VRU”)[“location”] = “John”;
Mike
VRU
John
ReferenceError
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248.
What is the output if following code executed?
function sayHello() {
“user strict”
for (x = 0; x < 10; x++)
console.log(Hi John!”);}
sayHelo();
RederenceError
TypeError
Hi John!
Null
Answer
Correct Answer:
TypeError
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249.
What is the correct syntax to create a new object ‘car’ with the following attributes?
Color = red
Model = 2016
Weight = 500kg
var car = {color:”red”, model:”2016”, weight:”500kg”};
var car = {color => ”red”, model => ”2016”, weight => ”500kg”};
var car = {color = ”red”, model = ”2016”, weight = ”500kg”};
var car.color = ”red”
var car.model = ”2016”
var car.weight = ”500kg”;
Answer
Correct Answer:
var car = {color:”red”, model:”2016”, weight:”500kg”};
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250.
Which of the following is not a valid JavaScript variable name?
3names
_first_name
FirstName
None of the above
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251.
What is the output of the below code?
X = 50 / “Apple”;
alert(x);
undefined
NaN
Infinity
50
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252.
Consider parsing a URL with the following code snippet?
var reg = /(\w+):\/\/([\w.]+)\/(\S*)/; var url = "http://www.myblog.com/"; var result = url.match(reg); if (result != null) { var path = result[1]; }
http://www.myblog.com/
www.myblog.com/
myblog.com/
http
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253.
A property is the object oriented equivalent of:
a function
an if statement
a variable
a reserved word
Answer
Correct Answer:
a variable
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254.
How do you round the number 3.14, to the nearest integer?
Math.round(3.14)
round(3.14)
rnd(3.14)
Math.rnd(3.14)
Answer
Correct Answer:
Math.round(3.14)
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255.
_____ JavaScript is also called client-side JavaScript?
Microsoft
Navigator
PHP
Web
Answer
Correct Answer:
Navigator
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256.
Document Methods in W3C DOM, supports all the methods available in Legacy DOM?
createTextNode( text)
getElementById( id)
getElementsByName( name)
documentElement
defaultView
Answer
Correct Answer:
createTextNode( text)
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257.
What will the output of the below code? function clickValue(){ alert(Math.round(-20.5)); } clickValue();
-20
-21
20
19.5
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258.
How can you detect the client's browser name?
client.navName
browser.appName
navigator.appName
None of these
Answer
Correct Answer:
navigator.appName
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259.
javascript can be termed as which of the following?
Web client side language
Object-oriented language
Object-based language
HighLevel language
Answer
Correct Answer:
HighLevel language
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260.
Which of the following is the correct way to append a value to an array in JavaScript?
arr[arr.length+1] = value
arr[arr.length] = value
arr[arr.length-1] = value
arr[arr.length*1] = value
Answer
Correct Answer:
arr[arr.length] = value
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261.
What is the correct JavaScript syntax to change the content of the HTML element with id "header"?
document.getElementById("header").innerHTML = "Updated Header!";
#header.innerHTML = "Updated Header!";
$header.innerHTML = "Updated Header!";
document.getElement("p").innerHTML = "Updated Header!";
Answer
Correct Answer:
document.getElementById("header").innerHTML = "Updated Header!";
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262.
A property of myobj is defined using:
property myobj x
myobj.x
myobj property x
var x propertyOf myob
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263.
How can you concatenate the following strings in javascript? var foo = "Lorem "; var bar = "Ipsum";
foo + bar;
foo.bar;
concatenate(foo,bar);
foo.concatenate(bar);
Answer
Correct Answer:
foo + bar;
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264.
What is the correct way to create a JavaScript array?
var cars = ["Saab", "Volvo", "BMW"];
var cars= "Saab", "Volvo", "BMW"
var cars= 1 = ("Saab"), 2 = ("Volvo"), 3 = ("BMW")
var cars= (1:"Saab", 2:"Volvo", 3:"BMW")
Answer
Correct Answer:
var cars = ["Saab", "Volvo", "BMW"];
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265.
When does the function name become optional?
Function is defined within a funtion
Function is defined as an expression
Function is predefined
Function is defined using Function constructor
Answer
Correct Answer:
Function is defined as an expression
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266.
What is the correct method to replace all occurrences of "Foo" with "Bar" in the following statement? var mystring = "Replace Foo with Bar at Foo and Foo.";
var replacedString = mystring.replace("Foo","Bar");
var replacedString = mystring.replace(/Foo/g,"Bar");
var replacedString = mystring.replace("/Foo/g","Bar");
var replacedString = mystring.replaceAll("Foo","Bar");
Answer
Correct Answer:
var replacedString = mystring.replace(/Foo/g,"Bar");
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267.
What is the correct regular expression to replace Mango with Apple in a string: var str = "Eat Mango!";
var res = str.replace(/mango/i, "apple");
var res = str.replace(%mango%,"apple");
var res = str.replace(*mango*,"apple");
var res = str.replace(/mango/, "apple");
Answer
Correct Answer:
var res = str.replace(/mango/i, "apple");
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268.
Which of following statements is incorrect regarding localStorage and sessionStorage?
localStorage - stores data with no expiration date
sessionStorage - stores data for one session
The data stored with sessionStorage is deleted when the user closes the browser window.
The data stored with localStorage will not be deleted when the browser is closed, and will be available the next day, week, or year.
None of above
Answer
Correct Answer:
None of above
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269.
Which JavaScript class represents regular expressions?
RegExpObj
RegExp
RegExpClass
StringExp
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270.
What will the following code return: Boolean(6 > 5)
NaN
false
true
1
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271.
Which of the following code snippets is best way to clear the canvas for redrawing?
var canvas = document.getElementById('canvasId'); var context = canvas.getContext('2d'); context.fillStyle = "#ffffff"; context.fillRect(0,0,canvas.width, canvas.height);
var canvas = document.getElementById('canvasId'); var context = canvas.getContext('2d'); ctx.save(); ctx.setTransform(1, 0, 0, 1, 0, 0); ctx.clearRect(0, 0, canvas.width, canvas.height); ctx.restore();
CanvasRenderingContext2D.prototype.clear = CanvasRenderingContext2D.prototype.clear || function (preserveTransform) { if (preserveTransform) { this.save(); this.setTransform(1, 0, 0, 1, 0, 0); } this.clearRect(0, 0, this.canvas.width, this.canvas.height); if (preserveTransform) { this.restore(); } }; var canvas = document.getElementById('canvasId'); var context = canvas.getContext('2d'); context.clear(); context.setTransform(-1, 0, 0, 1, 200, 200); context.clear(true);
var canvas = document.getElementById('canvasId'); var context = canvas.getContext('2d'); ctx.clearRect(0, 0, canvas.width, canvas.height);
Answer
Correct Answer:
var canvas = document.getElementById('canvasId'); var context = canvas.getContext('2d'); ctx.save(); ctx.setTransform(1, 0, 0, 1, 0, 0); ctx.clearRect(0, 0, canvas.width, canvas.height); ctx.restore();
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272.
Which of the following methods is used to get the current location of a user?
getUserPosition()
getCurrentPosition()
getPosition()
None of above
Answer
Correct Answer:
getCurrentPosition()
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273.
do while (a < b) runs
until a >= b
until a < b
until a > b
until a <= b
Answer
Correct Answer:
until a >= b
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274.
Which of the following is not a mouse event?
onmousescroller
onclick
onmouseover
onmousemove
Answer
Correct Answer:
onmousescroller
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275.
What will be the value of "mystring" variable when the following code is executed? var fruits = ["Banana", "Orange", "Apple", "Mango"]; fruits.pop(); var mystring = fruits.join(" * ");
Banana * Orange * Apple
Banana * Orange * Apple * Mango
Orange * Apple * Mango
mystring will be empty
Answer
Correct Answer:
Banana * Orange * Apple
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276.
What will be the final output ? var x=3; x=x<<3;
1
3
24
9
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277.
What is the event that fires when the form element textarea loses the focus?
Onclick
Ondblclick
Onfocus
Onblur
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278.
How would you change the date to one week later assuming myDate is a date object?
myDate.chgDate(7);
myDate.setDate(myDate.getDate()+7);
myDate.setDate(+7);
myDate.chgDate(myDate.getDate()+7);
Answer
Correct Answer:
myDate.setDate(myDate.getDate()+7);
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279.
What would be the output of below regular expression code: /e/.exec("The best things in life are free!");
e
6
4
true
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280.
What is the output of the following code? if(typeof(Storage)!=="undefined") { localStorage.age=5; sessionStorage.age=5; alert(localStorage.age + sessionStorage.age); } else { alert("Sorry, your browser does not support web storage..."); }
55
10
Sorry, your browser does not support web storage...
5undefined
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281.
What will be the output of following code snippet? var result = (function(a) { return a*a; }(5.5)); alert(result);
5
25
10
30.25
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282.
Which of the following is not a valid JavaScript Assignment Operator?
/=
*=
= %=
^
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283.
How can you convert a comma separated string variable txt into an array?
txtArray = txt.indexOf(',');
txtArray = txt.split(',');
txtArray = txt.trim(',');
txtArray = txt.substring(',');
Answer
Correct Answer:
txtArray = txt.split(',');
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284.
How do you find the number with the highest value of variable a and b?
top(a, b)
Math.max(a, b)
Math.ceil(a, b)
Math.highest(a, b)
Answer
Correct Answer:
Math.max(a, b)
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285.
Which of the following is not a JavaScript datatype?
Function
Boolean
Number
String
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286.
Which of the following statements are true for Java script?
a) JavaScript is case sensitive
b) JavaScript statements can be grouped together in blocks
c) semicolon at the end of statement is mandatory
Both a and b above
Both a and c above
Both b and c above
All of the above
Answer
Correct Answer:
All of the above
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287.
What will be the output of the following code? var foo = 10 << 1;
10
20
0
30
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288.
Which of the following is/are the correct way to redirect to a URL in javascript?
document.href= 'http://www.foobar.com';
window.location.assign("http://www.foobar.com")
window.location = 'http://www.foobar.com';
navigator.location = 'http://www.foobar.com';
Answer
Correct Answer:
window.location.assign("http://www.foobar.com")
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289.
Which of the following code snippets deletes cookie correctly?
var mydate = new Date(); mydate.setTime(mydate.getTime() - 1); document.cookie = "username=; expires=" + mydate.toGMTString();
document.cookie = null;
document.cookie = "username=John;password=John#1";
var mydate = new Date(); mydate.setTime(mydate.getTime() + 1000000); document.cookie = "username=; expires=" + mydate .toGMTString();
Answer
Correct Answer:
var mydate = new Date(); mydate.setTime(mydate.getTime() - 1); document.cookie = "username=; expires=" + mydate.toGMTString();
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290.
Which Window method is used to call a function or evaluate an expression at specified intervals?
setInterval()
repeat()
setTimeout()
Answer
Correct Answer:
setInterval()
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291.
What will be the output of following code? var x = 1; { var x = 2; } alert(x);
1
2
undefined
code will raise an exception
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292.
Which of the following is a valid syntax to create a function?
Function = demoFunction()
function:demoFunction()
function demoFunction()
function create demoFunction()
Answer
Correct Answer:
function demoFunction()
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293.
Which of the following code samples will correctly search for the word "for" in a string?
var str="This is test for javascript search !!!"; if(str.search("for") != -1) { alert("true"); } else { alert("false"); }
var str="This is test for javascript search !!!"; if(str.indexof("for") != -1) { alert("true"); } else { alert("false"); }
var str="This is test for javascript search !!!"; if(str.indexOf("for") != -1) { alert("true"); } else { alert("false"); }
var str="This is test for javascript search !!!"; if(str.contains("for") != -1) { alert("true"); } else { alert("false"); }
Answer
Correct Answer:
var str="This is test for javascript search !!!"; if(str.search("for") != -1) { alert("true"); } else { alert("false"); }
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294.
Which of the following is the most efficient way to clone a JavaScript object?
var newObject = jQuery.extend(true, {}, oldObject);
var newObject = JSON.parse(JSON.stringify(oldObject));
function clone(obj) { var target = {}; for (var i in obj) { if (obj.hasOwnProperty(i)) { target[i] = obj[i]; } } return target; } var newObject = clone(oldObject);
var newObject = jQuery.extend({}, oldObject);
Answer
Correct Answer:
var newObject = jQuery.extend(true, {}, oldObject);
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295.
What kind of Typed Arrays representation of the pixels does Canvas ImageData return when you call ImageData.data?
Uint8ClampedArray
Uint8Array
Int8Array
Uint32Array
Answer
Correct Answer:
Uint8ClampedArray
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296.
Which method evaluates a string of JavaScript code in the context of the specified object?
parseInt
Eval
parseFloat
Efloat
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297.
The following codes are for comparing equality operators "==" and "===" in JavaScript. Which of the following are the correct results?
var a = "12" + "3"; var b = "123"; return (a === b); result: true
var a = [1,2,3]; var b = [1,2,3]; return (a == b); result: false
var a = { x: 1, y: 2 }; var b = { x: 1, y: 2 }; return (a === b); result: true
var a = new String("123"); var b = "123"; return (a === b); result: true
var a = { x: 1, y: 2 }; var b = { x: 1, y: 2 }; return (a == b); result: true
Wrong ans MCQ MA type
Answer
Correct Answer:
var a = { x: 1, y: 2 }; var b = { x: 1, y: 2 }; return (a == b); result: true
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298.
What is the output of the given code? public class Test15 { public static void main(String[] args) { VO a = new VO(2); VO b = new VO(3); swapONE(a, b); print(a, b); swapTWO(a, b); print(a, b); } private static void print(VO a, VO b) { System.out.print(a.toString() + b.toString()); } public static void swapONE(VO a, VO b) { VO tmp = a; a = b; b = tmp; } public static void swapTWO(VO a, VO b) { int tmp = a.x; a.x = b.x; b.x = tmp; } } class VO { public int x; public VO(int x) { this.x = x; } public String toString() { return String.valueOf(x); } }
2332
3232
3223
2323
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299.
var p = { "p1": "value1", "p2": "value2", "p3": "value3" }; Which of the choices below produces the following output? output: p2 = value2
for (var key in p) { alert(key + " = " + p[key]); }
for (var key in p) { if (p.hasOwnProperties(key)) { alert(key + " = " + p[key]); } }
for(key in p) { alert( p[key] ); }
for (var key in p) { if (p.hasOwnProperty(key)) { alert(key + " = " + p[key]); } }
Answer
Correct Answer:
for (var key in p) { alert(key + " = " + p[key]); }
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300.
Which of the following is the correct syntax for using the JavaScript exec() object method?
RegExpObject.exec()
RegExpObject.exec(string)
RegExpObject.exec(parameter1,parameter2)
None of these
Answer
Correct Answer:
RegExpObject.exec(string)
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301.
Which of the following code snippets removes objects from an associative array?
delete array["propertyName"];
array.propertyName.remove();
array.splice(index, 1);
array["propertyName"].remove();
Answer
Correct Answer:
delete array["propertyName"];
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302.
Which of the following choices shows the correct result for the code below? var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());
Jani,Hege,Stale,Kai Jim,Borge Lene,Jani,Hege,Stale,Kai Jim,Borge
Jani,Hege,Stale,Kai Jim,Borge Jani,Hege,Lene,Stale,Kai Jim,Borge
Jani,Hege,Stale,Kai Jim,Borge Jani,Hege,Stale,Kai Jim,Lene,Borge
Jani,Hege,Stale,Kai Jim,Borge Jani,Hege,Stale,Kai Jim,Borge
Answer
Correct Answer:
Jani,Hege,Stale,Kai Jim,Borge Jani,Hege,Lene,Stale,Kai Jim,Borge
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303.
Which of the following will invoke the browser's Add To Favorite dialog box?
window.AddFavorite
document.AddFavorite
window.external.AddFavorite
It is not possible using JavaScript.
Answer
Correct Answer:
window.external.AddFavorite
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304.
Which of the following declarations is not valid?
var a var b var c
var a, b, c
var a=10, b=20, c=30
All the other options are valid.
Answer
Correct Answer:
All the other options are valid.
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305.
Which of the following statements are true regarding "window.onload" and "<body onload=""/>"?
There is no difference between "window.onload" and "body onload=""/>", and there is no general preference between the two, as far as best practices is concerned.
"window.onload" and "<body onload=""/>" are functionally equivalent, but "<body onload=""/>" is preferred because it combines the JavaScript code with the HTML markup.
"window.onload" and "<body onload=""/>" are functionally equivalent, but "window.onload" is preferred because it separates the JavaScript code from the HTML markup.
None of the above.
Answer
Correct Answer:
"window.onload" and "<body onload=""/>" are functionally equivalent, but "window.onload" is preferred because it separates the JavaScript code from the HTML markup.
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306.
Which of the following code snippets is more efficient, and why?
<script language=”JavaScript”>
For(i=0; i<document.images.length;i++)
Document.images[i].src=”blank.gif”;
</script>
<script language=”JavaScript”>
Var theimages = document.images;
For(i=0;i<theimages.length;i++)
Theimages[i].src”blank.gif”
</script>
Both are equally efficient.
The first code is more efficient as it contains less code.
The first code is more efficient as it employs object caching.
The second code is more efficient as it employs object caching.
Answer
Correct Answer:
The second code is more efficient as it employs object caching.
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307.
Which of the following cannot be achieved using JavaScript?
Read or write from external files (except .js files).
Access or modify browser settings.
Launch client processes (e.g. Windows applications).
Launching the default email application of the client.
Answer
Correct Answer:
Read or write from external files (except .js files).
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308.
While coding a loop, which statement can be used to ignore the rest of the statements, and continue with the beginning of the loop?
exit
return
continue
while
break
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309.
Which of the following properties can be used to dynamically change the value of a <tr> tag?
HTML
innerHTML
outerHTML
text
innerText
None of these
Answer
Correct Answer:
innerText
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310.
Consider the following code:
<script type="application/javascript;version=1.8">
var x = 5;
var y = 0;
var variable2=x + y;
let (x = x+10, y = 12) {
var variable1=x+y;
}
variable2=x + y;
</script>
Which of the following choices shows the correct values for "variable1" and "variable2"?
variable1: 27 variable2: 5
variable1: 27 variable2: 27
variable1: 32 variable2: 5
variable1: 32 variable2: 27
Answer
Correct Answer:
variable1: 27 variable2: 5
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311.
A form contains two fields named id1 and id2. How can you copy the value of the id2 field to id1?
document.forms[0].id1.value=document.forms[0].id2.value
document.forms[0].id2.value=document.forms[0].id1.value
document.id1.value=document.id2.value
document.id2.value=document.id1.value
Answer
Correct Answer:
document.forms[0].id1.value=document.forms[0].id2.value
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312.
How can it be determined if JavaScript is disabled in the user’s browser?
It is browser-deoendent.
There is no way to detect if javascript is disabled.
Use the HTML <noscript> tag to display different content if javaScript is disabled.
None of these.
Answer
Correct Answer:
Use the HTML <noscript> tag to display different content if javaScript is disabled.
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313. Which of the following statements regarding JSON is incorrect?
JSON is a lightweight data-interchange format.
JOSN is built on tow structures: A collection of name/value pairs and an ordered list of values.
JSON is a text format that is completely language independent.
Comments in JSON are allowed.
Answer
Correct Answer:
Comments in JSON are allowed.
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314. Which best describes void?
A method
A function
A statement
An operator
A built-in object
Answer
Correct Answer:
An operator
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315. Are the two statements below interchangeable?
Object.property
Object [‘’property’’]
Yes
No
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316.
Which of the following code prints false?
Var boolValue = new Boolean(‘’false’’);
alert (boolValue);
Var boolValue = new Boolean(‘’false’’);
alert (boolValue);
Var boolValue = string (‘’false’’) == ‘’false’’;
alert (boolValue);
Var boolValue = ‘’false’’;
alert ( !! boolValue);
Answer
Correct Answer:
Var boolValue = ‘’false’’;
alert ( !! boolValue);
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317.
Which of the following JavaScript Regular Expression object methods is used to search a string for a specified value and return the result as or false?
Exec { }
Compile { }
return { }
Test { }
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318.
What is the meaning of obfuscation in JavaScript?
Obfuscation is a keyword in javaScript.
Making code unreadable using advanced algorithms.
Decrypting encrypted source code using advanced algorithms.
None of these.
Answer
Correct Answer:
Making code unreadable using advanced algorithms.
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319.
What is the result of compiling and running the given code?
Public class test75 {
Public static void main(string[] args) {
System.out.printIn(new A(){{}}.tostring());
}
}
Class A {
Public string tostring() { return getclass().getName(); }
}
It gets a compiler error.
It complies, but throws NullPointerException at run-time.
It complies, runs, and prints “Test75” (without quotation marks).
It complies, runs, and prints “Test75$1” (without quotation marks).
Answer
Correct Answer:
It gets a compiler error.
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320.
Which event can detect when the user highlights text within a text or textarea object?
onSelect
onBlur
onChange
onMove
None of these
Answer
Correct Answer:
None of these
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321.
Which of the following browsers support a script tag's async attribute?
Firefox(Gecko), Internet Explorer, Opera, Safari.
Chrome, Internet Explorer, Opera, Safari.
Chrome, Firefox(Gecko), Opera, Safari.
Chrome, Firefox(Gecko), Internet Explorer, Safari.
Answer
Correct Answer:
Chrome, Firefox(Gecko), Opera, Safari.
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322.
Which of the following descriptions is true for the code below? var object0 = {}; Object.defineProperty(object0, "prop0", { value : 1, enumerable:false, configurable : true }); Object.defineProperty(object0, "prop1", { value : 2, enumerable:true, configurable : false }); Object.defineProperty(object0, "prop2", { value : 3 }); object0.prop3 = 4;
Object 'object0' contains 4 properties. Property 'prop2' and property 'prop3' are available in the for...in loop. Property 'prop0' and property 'prop1' are available to delete.
Object 'object0' contains 4 properties. Property 'prop1' and property 'prop2' are available in the for...in loop. Property 'prop2' and property 'prop3' are available to delete.
Object 'object0' contains 4 properties. Property 'prop0' and property 'prop2' are available in the for...in loop. Property 'prop0' and property 'prop2' are available to delete.
Object 'object0' contains 4 properties. Property 'prop1' and property 'prop3' are available in the for...in loop. Property 'prop0' and property 'prop3' are available to delete.
Answer
Correct Answer:
Object 'object0' contains 4 properties. Property 'prop1' and property 'prop3' are available in the for...in loop. Property 'prop0' and property 'prop3' are available to delete.
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323.
Which of the following is not a valid HTML event?
ondblclick
onmousemove
onclick
onblink
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324.
Consider the following scenario: The document.write() method is embedded to write some text within a pair of <td></td> table tags. Upon loading the file, however, garbled text appears on the section of the page where the text should be. What could be the reason for this?
The browser does not support JavaScript.
An older version of the browser is being used.
The browser does not support cookies.
Answer
Correct Answer:
The browser does not support JavaScript.
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325.
Consider three variables: someText = 'JavaScript1.2'; pattern = /(\w+)(\d)\.(\d)/i; outCome = pattern.exec(someText); What does pattern.global contain?
true
false
undefined
null
1
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326.
Select the following function that shuffles an array?
function shuffle(array) { var tmp, current, top = array.length; if(top) while(--top) { current = Math.floor(Math.random() * (top + 1)); tmp = array[current]; array[current] = array[top]; array[top] = tmp; } return array; }
function shuffle(array) { return array.sort(function(a,b) { return (a-b); }); }
function shuffle(array) { var results = new Array(); var sorted_arr = array.sort(); for (var i = 0; i < array.length - 1; i++) { if (sorted_arr[i + 1] == sorted_arr[i]) { results.push(sorted_arr[i]); } } return results; }
function shuffle(array) { for (var tmp, cur, top=array.length; top--;){ cur = (Math.random() * (top + 1)) << 0; tmp = array[cur]; array[cur] = array[top]; array[top] = tmp; } return array.sort(); }
Answer
Correct Answer:
function shuffle(array) { var tmp, current, top = array.length; if(top) while(--top) { current = Math.floor(Math.random() * (top + 1)); tmp = array[current]; array[current] = array[top]; array[top] = tmp; } return array; }
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327.
What will the following code snippet do? document.alinkColor="green"
It makes the background color of the document green.
It makes the color of the active links green.
It makes the color of the visited links green.
It makes the color of all links green.
None of these.
Answer
Correct Answer:
It makes the color of the active links green.
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328.
Which of the following correctly explains the difference between a "for...in" and a "for" loop?
"for...in" has two expressions. It iterates over the enumerable properties of an object, in an arbitrary order, for each distinct property, statements can be executed. This should not be used to iterate over an array where index order is important. "for" consists of three optional expressions enclosed in parentheses and separated by semicolons, followed by a statement executed in the loop.
"for...in" has three expressions. It iterates over the enumerable properties of an object, in an arbitrary order, for each distinct property, statements can be executed. This should not be used to iterate over an array where index order is important. "for" consists of four optional expressions enclosed in parentheses and separated by semicolons, followed by a statement executed in the loop.
"for...in" iterates over the enumerable properties of an object, in an arbitrary order, for each distinct property, statements can be executed. This should be used to iterate over an array where index order is important. "for" consists of three optional expressions enclosed in parentheses and separated by semicolons, followed by a statement executed in the loop.
"for...in" iterates over the enumerable properties of an object, in arbitrary order, for each distinct property, statements can be executed, this should be used to iterate over an array where index order is important. "for" consists of two optional expressions enclosed in parentheses and separated by semicolons, followed by a statement executed in the loop.
Answer
Correct Answer:
"for...in" iterates over the enumerable properties of an object, in an arbitrary order, for each distinct property, statements can be executed. This should be used to iterate over an array where index order is important. "for" consists of three optional expressions enclosed in parentheses and separated by semicolons, followed by a statement executed in the loop.
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329.
Which of the following check if an object has a specific property?
hasownproperty ()
hasProperty ()
It is browser-dependent.
None of these.
Answer
Correct Answer:
hasownproperty ()
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330.
What value would JavaScript assign to an uninitialized array element?
NaN
Null
Undefined
False
0
Answer
Correct Answer:
Undefined
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331.
If an image is placed styled with z-index=-1 and a text paragraph is overlapped with it, which one will be displayed on top?
The paragraph.
The image.
It depends on other rules.
Answer
Correct Answer:
It depends on other rules.
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332.
Consider the three variables: someText = 'JavaScript1.2'; pattern = /(\w+)(\d)\.(\d)/i; outCome = pattern.exec(someText); What does outCome[0] contain?
true
false
JavaScript1.2
null
0
Answer
Correct Answer:
JavaScript1.2
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333.
The statement navigator.platform indicates 'Win16' on user's computer that's running Windows NT. Which of the following is true?
navigator.platform is supposed to show 'Win16' on Windows NT.
The userAgent property reflects the correct operating system.
The property can be modified.
navigator.platform shows the operating system for which the browser was compiled for.
The browser version is outdated.
Answer
Correct Answer:
navigator.platform shows the operating system for which the browser was compiled for.
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334.
Which of the following Regular Expression pattern flags is not valid?
gi
p
i
g
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335.
Which of the following choices will turn a string into a JavaScript function call (case with objects) of the following code snippet? <script> window.foo = { bar: { baz: function() { alert('Hello!'); } } }; </script>
bar['baz']();
object['foo']['bar']['baz']();
document['foo']['bar']['baz']();
window['foo']['bar']['baz']();
Answer
Correct Answer:
window['foo']['bar']['baz']();
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336.
Consider the three variables: someText = 'JavaScript1.2'; pattern = /(\w+)(\d)\.(\d)/i; outCome = pattern.exec(someText); What does pattern.ignoreCase contain?
true
false
undefined
null
0
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337.
What value would JavaScript assign to an uninitialized variable?
NaN
null
undefined
false
Answer
Correct Answer:
undefined
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338.
Which of the following JavaScript Regular Expression modifiers finds one or more occurrences of a specific character in a string?
?
*
+
#
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339.
Which of the following snippets disable depreciated warnings in Wordpress like this one ? "Deprecated: Assigning the return value of new by reference is deprecated in /home//public_html/hub/wp-settings.php on line 647"
define(E_DEPRECATED, false);
error_reporting(E_ALL ^ E_DEPRECATED);
define(E_NOTICE, false);
error_reporting(WP_DEBUG, true)
Answer
Correct Answer:
error_reporting(E_ALL ^ E_DEPRECATED);
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340.
Image size limits can be set _______________.
directly in the posts
in the wp-imageresize plug-in
in the admin settings
both directly in the posts and in the wp-imageresize plug-in
Answer
Correct Answer:
in the admin settings
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341.
User Level 7 converts to _________?
Contributor
Author
Editor
Subscriber
Administrator
Answer
Correct Answer:
Administrator
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342.
From which version of WordPress can you choose your username during the installation process?
2.7
2.8
3.0
3.0.1
3.1
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343.
Which of the following is the correct way to change the admin URL to something else other than wp-admin?
Use the admin_default_page() function.
Change the site URL settings in General Settings.
Change the wp-admin folder name to something else.
This cannot be done.
Answer
Correct Answer:
This cannot be done.
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344.
Which of the following theme files can be used to customize the "page not found error" error page?
index.php
404.php
functions.php
page.php
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345.
Which of the following is the correct sequence of steps to adapt a WordPress plugin to a multisite?
Use $wpdb to iterate through all blogs 2. Hook according to the $blog_id 3. Install the plugin as Network only 4. Uninstall depends on the specific plugin
. Use $wp_posts to iterate through all blogs 2. Hook according to the $function 3. Install the plugin as Network only 4. Uninstall depends on the specific plugin
Use $wp_posts to iterate through all blogs 2. Hook according to the $function 3. Install other activations except Network 4. Uninstall is the same for all the plugins
Use $wp_posts to iterate through all blogs 2. Hook according to the $function 3. Install the plugin as Network only 4. Uninstall is same for all the plugins
Answer
Correct Answer:
Use $wpdb to iterate through all blogs 2. Hook according to the $blog_id 3. Install the plugin as Network only 4. Uninstall depends on the specific plugin
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346.
How can a featured image be added to a WordPress post programmatically?
'alignleft')); ?>
add_theme_support( 'post-thumbnails' );
get_the_post_thumbnail()
Answer
Correct Answer:
'alignleft')); ?>
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347.
How can a plugin function be called using Ajax?
Adding the JavaScript file: jQuery(document).ready(function($) { jQuery.post(ajax_object.ajax_url, data, function(response) {alert('Got this from the server: ' + response);}); }); 2. Then adding the PHP file: add_action('wp_ajax_my_action', 'my_action_callback'); function my_action_callback() { $whatever = intval( $_POST['whatever'] ); $whatever += 10; echo $whatever; return(); }
1. Adding the JavaScript file: jQuery(document).ready(function($) { var data = {action: 'my_action',whatever: ajax_object.we_value }; jQuery.post(ajax_object.ajax_url, data, function(response) {alert('Got this from the server: ' + response);}); }); 2. Then adding the PHP file: add_action('wp_ajax_my_action', 'my_action_callback'); function my_action_callback() { $whatever = intval( $_POST['whatever'] ); $whatever += 10; echo $whatever; true(); }
1. Adding the JavaScript file: jQuery(document).ready(function($) { var data = {action: 'my_action',whatever: ajax_object.we_value }; jQuery.post(ajax_object.ajax_url, data, function(response) {alert('Got this from the server: ' + response);}); }); 2. Then adding the PHP file: function my_action_callback() { $whatever = intval( $_POST['whatever'] ); $whatever += 10; echo $whatever; end(); }
1. Adding the JavaScript file: jQuery(document).ready(function($) { var data = {action: 'my_action',whatever: ajax_object.we_value }; jQuery.post(ajax_object.ajax_url, data, function(response) {alert('Got this from the server: ' + response);}); }); 2. Then adding the PHP file:
Answer
Correct Answer:
1. Adding the JavaScript file: jQuery(document).ready(function($) { var data = {action: 'my_action',whatever: ajax_object.we_value }; jQuery.post(ajax_object.ajax_url, data, function(response) {alert('Got this from the server: ' + response);}); }); 2. Then adding the PHP file:
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348.
Which of the following will automatically create a page upon activating a WordPress plugin?
register_activation_hook( __FILE__, 'my_plugin_install_function'); function my_plugin_install_function() { $post = array( 'comment_status' => 'closed', 'ping_status' => 'closed' , 'post_author' => 1, 'post_date' => date('Y-m-d H:i:s'), 'post_name' => 'Checklists', 'post_status' => 'publish' , 'post_title' => 'Checklists', 'post_type' => 'post', ); $newvalue = wp_insert_post( $post, true); update_option( 'hclpage', $newvalue ); }
register_activation_hook( __FILE__, 'my_plugin_install_function'); function my_plugin_install_function() { $post = array( 'comment_status' => 'closed', 'ping_status' => 'closed' , 'post_author' => 1, 'post_date' => date('Y-m-d H:i:s'), 'post_name' => 'Checklists', 'post_status' => 'publish' , 'post_title' => 'Checklists', 'post_type' => 'page', ); $newvalue = wp_insert_post( $post, false ); update_option( 'hclpage', $newvalue ); }
register_activation_hook( __FILE__, 'my_plugin_install_function'); function my_plugin_install_function() { $post = array( 'comment_status' => 'closed', 'ping_status' => 'closed' , 'post_author' => 1, 'post_date' => date('Y-m-d H:i:s'), 'post_name' => 'Checklists', 'post_status' => 'publish' , 'post_title' => 'Checklists', 'post_type' => 'post', ); $newvalue = wp_insert_posts( $post, true); update_option( 'hclpage', $newvalue ); }
register_activation_hook( __FILE__, 'my_plugin_install_function'); function my_plugin_install_function() { $post = array( 'comment_status' => 'closed', 'ping_status' => 'closed' , 'post_author' => 1, 'post_date' => date('Y-m-d H:i:s'), 'post_name' => 'Checklists', 'post_status' => 'publish' , 'post_title' => 'Checklists', 'post_type' => 'page', ); $newvalue = wp_insert_posts( $post, false ); update_option( 'hclpage', $newvalue ); }
Answer
Correct Answer:
register_activation_hook( __FILE__, 'my_plugin_install_function'); function my_plugin_install_function() { $post = array( 'comment_status' => 'closed', 'ping_status' => 'closed' , 'post_author' => 1, 'post_date' => date('Y-m-d H:i:s'), 'post_name' => 'Checklists', 'post_status' => 'publish' , 'post_title' => 'Checklists', 'post_type' => 'page', ); $newvalue = wp_insert_posts( $post, false ); update_option( 'hclpage', $newvalue ); }
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349.
Which of the following code snippets is the correct way to get content from Tinymce via javascript ?
document.getElementById('content')
tinymce.activeEditor.getContent();
tinymce.element.getContent();
document.getElement('tinymce_content')
Answer
Correct Answer:
tinymce.activeEditor.getContent();
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350.
What should be done if a fatal error message "Out of Memory" is received while adding a new post in WordPress?
Contact hosting provider to get memory increased.
Add clear('WP_CACHE', '0'); to your wp-config.php file.
Add define('WP_MEMORY_LIMIT', '64M'); to your wp-config.php file.
Install a cache plugin and clear the cache memory from it.
Answer
Correct Answer:
Add define('WP_MEMORY_LIMIT', '64M'); to your wp-config.php file.
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351.
Who of the following persons can read a post locked by password?
Only administrators, editors and authors
Registered users who knows password
Anyone who knows a password
Answer
Correct Answer:
Anyone who knows a password
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352.
How would you integrate WordPress Tiny MCE editor with a plugin?
wp_enqueue_script('tiny_mce')
wp_editor( $content, $id );
add_action('init','tiny_mce')
Cannot integrate Tiny MCE with custom plug ins
Answer
Correct Answer:
wp_editor( $content, $id );
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353.
How can the Home link be disable from the Wordpress top nav?
Using Jquery to hide it
By adding this code in functions.php function page_menu_args( $args ) { $args['show_home'] = FALSE; return $args; } add_filter( 'wp_page_menu_args', 'page_menu_args' );
wp_nav_menu( array('menu' => 'news', 'show_home' => false))
Can not disable the default Home link from wordpress top nav
Answer
Correct Answer:
By adding this code in functions.php function page_menu_args( $args ) { $args['show_home'] = FALSE; return $args; } add_filter( 'wp_page_menu_args', 'page_menu_args' );
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354.
Which of the following is an incorrect way to force www to a WordPress URL?
Modify the config.php file.
Modify the .htaccess file.
Change the WordPress and site address in General Settings.
Install and configure a redirection plugin.
Answer
Correct Answer:
Modify the config.php file.
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355.
Which of the following code snippets removes the "Home" link from the "wp_nav_menu" ?
news', 'show_home' => false)); ?>
news', 'show_home' =0 )); ?>
In functions.php following code should be added: function page_menu_args( $args ) { $args['show_home'] = FALSE; return $args; } add_filter( 'wp_page_menu_args', 'page_menu_args' ); Plus additional snippet code: wp_nav_menu( array('echo'=>true));
$("div.menu > ul li:first-child").css("display","none");
Answer
Correct Answer:
In functions.php following code should be added: function page_menu_args( $args ) { $args['show_home'] = FALSE; return $args; } add_filter( 'wp_page_menu_args', 'page_menu_args' ); Plus additional snippet code: wp_nav_menu( array('echo'=>true));
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356.
Conditional tags can be used to _______________________.
get all comments from one post
get all posts from one category
change the content to be displayed
None of the above: conditional tags are not available in WordPress.
Answer
Correct Answer:
change the content to be displayed
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357.
Which of the following role levels has the highest privilege?
Level_0
Level_10
Depends on your settings.
Every role level has the same privilege.
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358.
Which function is used to display the name of current page in wordpress?
get_the_title()
content_title()
page_name()
post_name()
Answer
Correct Answer:
get_the_title()
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359.
User Level 1 converts to _________?
Contributor
Author
Editor
Subscriber
Administrator
Answer
Correct Answer:
Contributor
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360.
In which way MD5 hash does wordpress stores and represents?
In Hex string
In Base64 string
in raw data file
text file
Answer
Correct Answer:
In Hex string
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361.
What is the output of the following code? <?php // example from php.net function callback($buffer) { // replace all the apples with oranges return (str_replace("apples", "oranges", $buffer)); } ob_start("callback"); ?> <html><body> <p>It's like comparing apples to oranges.</p> </body></html> <?php ob_end_flush(); ?> /* output: <html><body> <p>It's like comparing oranges to oranges.</p> </body></html> */
Wordpress output buffer filter catching the final html output
Wordpress input buffer filter modify the final html input
Wordpress output buffer filter deleting the final html input
Wordpress filter caching the final html input
Answer
Correct Answer:
Wordpress input buffer filter modify the final html input
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362.
What is the output of the following code? <ul id="sortable"> <li id="1">example 1</li> <li id="2">example 2</li> <li id="3">example 3</li> <li id="4">example 4</li> </ul> $(document).ready(function(){ $('#sortable').sortable({ update: function(event, ui) { var newOrder = $(this).sortable('toArray').toString(); $.get('saveSortable.php', {order:newOrder}); } }); });
Removes positions from data base based on the user input
Saves sortable positions to data base based on the user input
Adding new sortable positions from another data base
Sorting out existing positions without updating the data base with the new user inputs
Answer
Correct Answer:
Saves sortable positions to data base based on the user input
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363.
____________ can write their own posts but may not publish or delete them. Their HTML is limited to the set of allowed tags and they cannot upload media files.
Contributor
Author
Editor
Subscriber
Administrator
Answer
Correct Answer:
Contributor
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364.
How can a WordPress template be integrated inside a codeigniter framework using WordPress functions like wp_header,wp_footer,wp_sidebar?
Include the file wp-blog-header.php from WordPress installation directory to codeigniters index.php and create template inside codeigniter's view.
Include the file wp-settings.php from WordPress installation directory to codeigniters index.php and create template inside codeigniter's view.
Create template inside WordPress theme directory and include the file in codeigniter's view.php file.
It is not possible to integrate wordpress with codeigniter.
Answer
Correct Answer:
Include the file wp-blog-header.php from WordPress installation directory to codeigniters index.php and create template inside codeigniter's view.
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365.
Which of the following will return only the src attribute of an tag while using the post_thumbnail() function in WordPress?
get_the_post_thumbnail_src( $post->ID, 'thumbnail' );
wp_get_attachment_image_src( get_post_thumbnail_id($post->ID),
KickExam Pvt. Ltd.
array(320,240), false, '' );
the_post_src_thumbnail( $size, $attr );
set_post_thumbnail_size( 50, 50 );
Answer
Correct Answer:
wp_get_attachment_image_src( get_post_thumbnail_id($post->ID),
KickExam Pvt. Ltd.
array(320,240), false, '' );
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366.
Which deprecated functions are still in use in WordPress?
register_globals()
magc_quotes()
addslashers()
get_permalink()
Answer
Correct Answer:
magc_quotes()
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367.
Which of the following cannot be used to output content from WordPress?
WP_Query
get_query_posts
query_posts
get_posts
Answer
Correct Answer:
get_query_posts
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368.
How can the class name of a sub-menu be changed in the wp_nav_menu?
By manually adding the class name in Appearance-->Menus
Wordpress does not support the ability to change the class name of a sub-menu in the wp_nav_menu.
By adding the following code in functions.php: class UL_Class_Walker extends Walker_Nav_Menu { function start_lvl(&$output, $depth) { $indent = str_repeat("\t", $depth); $output .= "\n$indent<ul class=\"level-".$depth."\">\n"; } }
By adding the following code in header.php: class UL_Class_Walker extends Walker_Nav_Menu { function start_lvl(&$output, $depth) { $indent = str_repeat("\t", $depth); $output .= "\n$indent<ul class=\"level-".$depth."\">\n"; } }
Answer
Correct Answer:
By adding the following code in functions.php: class UL_Class_Walker extends Walker_Nav_Menu { function start_lvl(&$output, $depth) { $indent = str_repeat("\t", $depth); $output .= "\n$indent<ul class=\"level-".$depth."\">\n"; } }
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369.
What is the right order (by priority in use) to display page in Template Hierarchy?
page-{slug}.php, page-{id}.php, page.php, index.php
page-{id}.php, page-{slug}.php, page.php, index.php
page-{slug}.php, page-{id}.php, page.php, archive.php, index.php
page-{slug}.php, page-{id}.php, page.php, 404.php
Answer
Correct Answer:
page-{slug}.php, page-{id}.php, page.php, index.php
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370.
How can widgets for individual pages be managed within the page editor?
By creating a new sidebar for every page
By including sidebar.php in every page
By creating a new sidebar for the page, followed by conditional display rules on individual widgets
By using a custom widget plugin
Answer
Correct Answer:
By using a custom widget plugin
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371.
Which of the following is a Online Code Coloring Service?
Prettify
SyntaxHighligherText
Edit Pad
Collabedit
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372.
Meta tags can be added to WordPress pages by ________________.
using plug-ins
adding them to the header.php file
updating the database
using plug-ins and adding them to the header.php file
adding them to the header.php file and updating the database
Answer
Correct Answer:
using plug-ins and adding them to the header.php file
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373.
How many built-in user roles does WordPress have?
3
4
5
6
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374.
How can the use of html code in comments be disabled?
By disabling the feature in the config file.
By disabling the feature in admin settings.
By changing the theme's source code.
Answer
Correct Answer:
By changing the theme's source code.
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375.
_____________ can publish, edit, and delete their own posts. They cannot write pages. They can upload some kinds of media files, and they are allowed to use only the limited set of HTML tags.
Contributor
Author
Editor
Subscriber
Administrator
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376.
You can limit the number of revisions WordPress stores by _____ Note: Categories must have distinct slugs. Even if two categories have different parents and would therefore have different permalinks, you can't assign them the same slug.
adding the following line to your wp-config.php file: define('WP_POST_REVISIONS', 3);
using a plugin
changing a setting on admin panel
Answer
Correct Answer:
adding the following line to your wp-config.php file: define('WP_POST_REVISIONS', 3);
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377.
How can a user be found through its meta data?
User can not be retrieved through its meta data
get_user_by_metadata($metaid,$metavalue)
get_user($args)
get_users($args)
Answer
Correct Answer:
get_users($args)
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378.
Which of the following will hash a string/password to its md5 equivalent?
md5()
wp_generate_password()
wp_generate_md5()
password_md5()
Answer
Correct Answer:
wp_generate_password()
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379.
Which of the following will give the option to add inline Ajax for comment posting?
Enabling Ajax in the wp-config.php file
Activating Ajax from the admin settings of WordPress
Using the Ajax Comment Posting plugin
Wordpress doesn't support inline Ajax.
Answer
Correct Answer:
Using the Ajax Comment Posting plugin
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380.
Which of the following is the correct code to get an array of every image uploaded to a particular post?
$images =& get_children( 'post_type=attachment&post_mime_type=image&post_parent=10' );
$images = wp_get_attachment_url( get_post_thumbnail_id($post->ID) );
$images = get_post(7, ARRAY_A);
It cannot be done
Answer
Correct Answer:
$images = wp_get_attachment_url( get_post_thumbnail_id($post->ID) );
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381.
Which of the following will show the most recent post (by date) from a custom taxonomy?
select * from wp_posts where ID in( select ID from ( select wp_posts.ID , wp_posts.post_date, d.name from wp_posts as a join wp_term_relationships as b on ( a.ID = b.object_id) join wp_term_taxonomy as c on (b.term_taxonomy_id = c.term_taxonomy_id) join wp_terms as d on (c.term_id = d.term_id) where c.taxonomy = 'post-series' group by d.name having (wp_posts.post_date = max(wp_posts.post_date)) )tmp)
select * from wp_posts where ID in( select ID from ( select wp_posts.ID , wp_posts.post_date, d.name from wp_posts as a join wp_terms as d on (c.term_id = d.term_id) where c.taxonomy = 'post-series' group by d.name having (wp_posts.post_date = max(wp_posts.post_date)) )tmp)
select * from wp_posts where ID in( select ID from ( select wp_posts.ID , wp_posts.post_date, d.name from wp_posts as a join wp_term_relationships as b on ( a.ID = b.object_id) join wp_term_taxonomy as c on (b.term_taxonomy_id = c.term_taxonomy_id) join wp_terms as d on (c.term_id = d.term_id) having (wp_posts.post_date = max(wp_posts.post_date)) )tmp)
select * from wp_posts where ID in( select ID from ( select wp_posts.ID , wp_posts.post_date, d.name from wp_posts as a join wp_term_relationships as b on ( a.ID = b.object_id) join wp_terms as d on (c.term_id = d.term_id) where c.taxonomy = 'post-series' group by d.name having (wp_posts.post_date = max(wp_posts.post_date)) )tmp)
Answer
Correct Answer:
select * from wp_posts where ID in( select ID from ( select wp_posts.ID , wp_posts.post_date, d.name from wp_posts as a join wp_term_relationships as b on ( a.ID = b.object_id) join wp_terms as d on (c.term_id = d.term_id) where c.taxonomy = 'post-series' group by d.name having (wp_posts.post_date = max(wp_posts.post_date)) )tmp)
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382.
Which of the following can be used to create a folder if it does not already exist on server through WordPress?
function createPath($path) { if (is_dir($path)) return true; $prev_path = substr($path, strrpos($path, '/', -2) + 1 ); $return = createPath($prev_path); return ($return && is_writable($prev_path)) ? mkdir($path) : false; }
function createPath($path) { if (is_dir($path)) return true; $prev_path = substr($path, 0, strrpos($path, '/', -2) + 1 ); $return = createPath($prev_path); return ($return && is_writable($prev_path)) ? mkdir($path) : false; }
function createPath($path) { if (is_dir($path)) return true; $prev_path = substr($path, 0, strrpos($path, -2) + 1 ); $return = createPath($prev_path); return ($return && is_writable($prev_path)) ? mkdir($path) : false; }
function createPath($path) { if (is_dir($path)) return true; $prev_path = substr($path, 0, strrpos($path, '/', -2) + 1 ); $return = createPath($prev_path); return ($return && is_writable($prev_path1)) ? mkdir($path) : false; }
Answer
Correct Answer:
function createPath($path) { if (is_dir($path)) return true; $prev_path = substr($path, 0, strrpos($path, -2) + 1 ); $return = createPath($prev_path); return ($return && is_writable($prev_path)) ? mkdir($path) : false; }
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383.
Which of the following codes is correct for sorting tags of the "WordPress Tag Cloud", when those tags contain special characters?
function custom_tag_sort($tags, $args) { if ($args['orderby'] != 'name') { return $tags; } uasort($tags, 'custom_tag_sort_compare'); } function custom_tag_sort_compare($a, $b) { return strnatcasecmp( custom_tag_sort_normalize($a->name), custom_tag_sort_normalize($b->name) ); } function custom_tag_sort_normalize($tag) { $tag = trim($tag, '"'); $tag = preg_replace('/^\s+the\s+/i', '', $tag); return $tag; } add_filter('tag_cloud_sort', 'custom_tag_sort');
function custom_tag_sort($tags, $args) { if ($args['orderby'] != 'name') { return $tags; } uasort($tags, 'custom_tag_sort_compare'); } function custom_tag_sort_compare($a, $b) { return strnatcasecmp( custom_tag_sort_normalize($a->name), custom_tag_sort_normalize($b->name) ); } function custom_tag_sort_normalize($tag) { $tag = trim($tag, '"'); $tag = preg_replace('/^\s*the\s+/i', '', $tag); return $tag; } add_filter('tag_cloud_sort', 'custom_tag_sort');
function custom_tag_sort($tags, $args) { if ($args['orderby'] = 'name') { return $tags; } uasort($tags, 'custom_tag_sort_compare'); } function custom_tag_sort_compare($a, $b) { return strnatcasecmp( custom_tag_sort_normalize($a->name), custom_tag_sort_normalize($b->name) ); } function custom_tag_sort_normalize($tag) { $tag = trim($tag, '"'); $tag = preg_replace('/^\s*the\s+/i', '', $tag); return $tag; } add_filter('tag_cloud_sort', 'custom_tag_sort');
function custom_tag_sort($tags, $args) { if ($args['orderby'] = 'name') { return $tags; } uasort($tags, 'custom_tag_sort_compare'); } function custom_tag_sort_compare($a, $b) { return strnatcasecmp( custom_tag_sort_normalize($a->name), custom_tag_sort_normalize($b->name) ); } function custom_tag_sort_normalize($tag) { $tags = trim($tag, '"'); $tags = preg_replace('/^\s+the\s+/i', '', $tag); return $tags; } add_filter('tag_cloud_sort', 'custom_tag_sort');
Answer
Correct Answer:
function custom_tag_sort($tags, $args) { if ($args['orderby'] != 'name') { return $tags; } uasort($tags, 'custom_tag_sort_compare'); } function custom_tag_sort_compare($a, $b) { return strnatcasecmp( custom_tag_sort_normalize($a->name), custom_tag_sort_normalize($b->name) ); } function custom_tag_sort_normalize($tag) { $tag = trim($tag, '"'); $tag = preg_replace('/^\s+the\s+/i', '', $tag); return $tag; } add_filter('tag_cloud_sort', 'custom_tag_sort');
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384.
Which of the following is the correct way to assign a category to a Wordpress post?
wp_set_post_categories($postId,$categories)
wp_set_category($catId,$postId)
By XML-RPC call to wpc.newPost
This is not possible
Answer
Correct Answer:
wp_set_post_categories($postId,$categories)
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385.
____________ can manage their own profiles, but can do virtually nothing else in the administration area.
Contributor
Author
Editor
Subscriber
Administrator
Answer
Correct Answer:
Subscriber
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386.
How can the upload media panel be included in a Wordpress template/plugin?
By using function wp_enqueue_script('media-upload')
By using function wp_add_media( );
By using function wp_enqueue_script('upload');
By using function wp_add_script('media-upload');
Answer
Correct Answer:
By using function wp_enqueue_script('media-upload')
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387.
A possible way to allow the display of several authors' names on one post is to ______
update the database
change the admin settings
change the config files
use a plug-in
Answer
Correct Answer:
use a plug-in
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388.
Which of the following is the correct way to retrieve a featured image from a post?
<?php echo get_post_thumb($page->ID, 'thumbnail'); ?>
<?php echo get_featured_image($page->ID, 'thumbnail'); ?>
<?php echo get_the_post_thumbnail($page->ID, 'thumbnail'); ?>
<?php echo get_post_thumbnail($page->ID, 'thumbnail'); ?>
Answer
Correct Answer:
<?php echo get_the_post_thumbnail($page->ID, 'thumbnail'); ?>
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389.
What are the database privileges that are required for WordPress?
insert, delete, update, drop and alter
select, insert, delete, update, create, drop and alter
insert, delete, update, create, drop and alter
insert and delete
Answer
Correct Answer:
select, insert, delete, update, create, drop and alter
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390.
Which of the following codes will return the current plugin directory in WordPress?
<?php plugin_basename($file); ?>
<?php plugin_basename('url'); ?>
<?php bloginfo_plugin('url'); ?>
<?php content_plugin_url( $path ); ?>
Answer
Correct Answer:
<?php plugin_basename($file); ?>
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391.
Are categories and tags available for pages? Note: Categories must have distinct slugs. Even if two categories have different parents and would therefore have different permalinks, you can't assign them the same slug.
Yes
No
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392.
Which of the following WordPress Multisite functions allows for getting content from one blog and display it on another?
switch_blog()
switch_to_blog()
restore_current_blog()
restore_to_current_blog()
Answer
Correct Answer:
switch_to_blog()
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393.
One possible way to collect realtime statistics about traffic on a WordPress site is:
using a built-in tool
using a plugin
using a widget
Traffic statistics cannot be collected on a WordPress site.
Answer
Correct Answer:
using a plugin
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394.
How can a custom content filter be added?
By using add_action('the_content','my_custom_filter')
By using add_filter('the_content','my_custom_filter')
By using wp_filter('the_content','my_custom_filter')
By using add_action('content','my_custom_filter')
Answer
Correct Answer:
By using add_filter('the_content','my_custom_filter')
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395.
Which of the following is the correct way to get WordPress Post ID from the Post title?
$page = get_page_title( 'About' ); wp_pages( 'exclude=' . $page->ID );
$page = get_page_by_title( 'Home' ); $page_id = $page->ID;
$page = get_page_by_title( 'About' ); wp_pages( 'exclude=' . $page->ID );
None of the above
Answer
Correct Answer:
$page = get_page_by_title( 'About' ); wp_pages( 'exclude=' . $page->ID );
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396.
Is super cache a built-in plugin of WordPress?
Yes
No
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397.
What is the BEST way to get last inserted row ID from Wordpress database ?
Use the following code snippet $lastid->$wpdb=$last->get_row;
The call to mysql_insert_id() inside a transaction should be added: mysql_query('BEGIN'); // Whatever code that does the insert here. $id = mysql_insert_id(); mysql_query('COMMIT'); // Stuff with $id.
The following code snippet should be added $last = $wpdb->get_row("SHOW TABLE STATUS LIKE 'table_name'"); $lastid = $last->Auto_increment;
Straight after the $wpdb->insert() insert, the following code should be added: $lastid = $wpdb->insert_id;
Answer
Correct Answer:
Straight after the $wpdb->insert() insert, the following code should be added: $lastid = $wpdb->insert_id;
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398.
Which of the following functions can be used to create a WordPress page?
wp_insert_post()
wp_insert_page()
wp_create_post()
wp_create_page()
Answer
Correct Answer:
wp_insert_post()
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399.
On which of the following databases can WordPress be installed by default?
MySQL
Oracle Database
Microsoft SQL Server
PostgreSQL
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400.
Which of the following actions cannot be hooked in with add_submenu_page() function?
admin_submenu
admin_menu
user_admin_menu
network_admin_menu
Answer
Correct Answer:
admin_menu
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401.
Which of the following is the correct way to filter the content for a few posts?
By using apply_filters(filter,postId)
This is not possible in wordpress
Can create filter for posts in a specific wordpress category
Passing arguments into the_content()
Answer
Correct Answer:
By using apply_filters(filter,postId)
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402.
What is the first action you need to take for enabling the WordPress multisite (MS) feature?
Enable the WordPress multisite feature on admin panel
Enable the Network feature
Add this code to wp-config.php file: define( 'WP_ALLOW_MULTISITE', true );
Answer
Correct Answer:
Add this code to wp-config.php file: define( 'WP_ALLOW_MULTISITE', true );
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403.
Which of the functions below is required to create a new taxonomy?
add_taxonomy
register_taxonomy
create_taxonomy
Answer
Correct Answer:
register_taxonomy
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404.
What is the BEST option to integrate Facebook into Wordpress registration/login ?
By using "Simple Facebook Connect" wordpress plugin
By using the "OpenID" plugin
By using the "Social Connect" plugin
By using the "Facebook Registration Tool" plugin
Answer
Correct Answer:
By using "Simple Facebook Connect" wordpress plugin
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405.
Which of the following is a quick way to move a Wordpress website from one server to another?
Using migration plugin
Copying wordpress files and database from source to destination server
Using XML export through wp-admin interface
Install new wordpress and copy theme and plugin directory
Answer
Correct Answer:
Using migration plugin
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406.
Which conditional tag checks if the dashboard or the administration panel is attempting to be displayed by returning "true' (if the URL being accessed is in the admin section) or "false" (for a front-end page).
my_admin()
view_admin()
is_admin()
root_admin()
Answer
Correct Answer:
is_admin()
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407.
Which of the following will correctly load localized (translated) text for a WordPress plugin?
function custom_theme_setup() { $lang_dir = get_template_directory() . '/lang'); load_theme_textdomain('tutsplus', $lang_dir); } add_action('after_setup_theme', 'custom_theme_setup');
function custom_theme_setup() { $lang_dir = get_template_directory() . '/lang'); add_action('after_setup_theme', 'custom_theme_setup'); }
function custom_theme_setup() { $lang_dir = get_template_directory() . '/lang'); add_action('after_setup_theme', 'custom_theme_setup'); } load_theme_textdomain('tutsplus', $lang_dir);
function load_theme_textdomain('tutsplus', $lang_dir); { $lang_dir = get_template_directory() . '/lang'); custom_theme_setup(); } add_action('after_setup_theme', 'custom_theme_setup');
Answer
Correct Answer:
function custom_theme_setup() { $lang_dir = get_template_directory() . '/lang'); load_theme_textdomain('tutsplus', $lang_dir); } add_action('after_setup_theme', 'custom_theme_setup');
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408.
How can a post ID be retrieved from the permalink?
Its not possible to retrieve the post ID from a permalink due to its structure.
It can be retrieved by using a Regular Expression.
wp_get_post_id($permalink)
url_to_postid($permalink)
Answer
Correct Answer:
url_to_postid($permalink)
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409.
Which of the following code snippets will create plugins back-end page without showing it as menu item?
add_submenu_page with parent slug = null
add_menu_page with parent slug = null
add_submenu_page without parent slug = null
add_menu_page without parent slug = null
Answer
Correct Answer:
add_menu_page without parent slug = null
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410.
Which of the following functions are used to add administration menu item in WordPress ?
add_menu_page();
add_admin_item();
add_admin_page();
add_admin_option();
Answer
Correct Answer:
add_menu_page();
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411.
Which of the following will correctly add custom mod rewrite rules to .htaccess from a WordPress plugin?
$custom_mod_rewrite = new custom_mod_rewrite; register_activation_hook( __FILE__, array($custom_mod_rewrite, 'flush_rewrite_rules')); register_deactivation_hook( __FILE__, array($custom_mod_rewrite, 'flush_rewrite_rules')); add_action('generate_rewrite_rules', array($custom_mod_rewrite, "generate_rewrite_rules")); class custom_mod_rewrite { function __construct() { $this->wp_rewrite = & $POST["wp_rewrite"]; }}
$custom_mod_rewrite = new custom_mod_rewrite; register_activation_hook( __FILE__, array($custom_mod_rewrite, 'flush_rewrite_rules')); register_deactivation_hook( __FILE__, array($custom_mod_rewrite, 'flush_rewrite_rules')); add_action('generate_rewrite_rules', array($custom_mod_rewrite, "generate_rewrite_rules")); class custom_mod_rewrite { function __construct() { $this->wp_rewrite = & $GLOBALS["wp_rewrite"]; } }
$custom_mod_rewrite = new custom_mod_rewrite; register_activation_hook( __FILE__, array($custom_mod_rewrite, 'flush_rewrite_rules')); register_deactivation_hook( __FILE__, array($custom_mod_rewrite, 'flush_rewrite_rules')); add_action('generate_rewrite_rules', array($custom_mod_rewrite, "generate_rewrite_rules")); class
KickExam Pvt. Ltd.
custom_mod_rewrite { function __construct() { $this->wp_rewrite = & $GLOBALS["wp_rewrite"]; } function mod_rewrite_rules($rules) { return preg_replace('#^(RewriteRule \^.*/)\?\$plugin_name .*(http://.*) \[QSA,L\]#mi', '$1 $2 [R=301,L]', $rules); } }
$custom_mod_rewrite = new custom_mod_rewrite; register_activation_hook( __FILE__, array($custom_mod_rewrite, 'flush_rewrite_rules')); register_deactivation_hook( __FILE__, array($custom_mod_rewrite, 'flush_rewrite_rules')); add_action('generate_rewrite_rules', array($custom_mod_rewrite, "generate_rewrite_rules")); class custom_mod_rewrite { function __construct() { $this->wp_rewrite = & $SESSION["wp_rewrite"]; } }
Answer
Correct Answer:
$custom_mod_rewrite = new custom_mod_rewrite; register_activation_hook( __FILE__, array($custom_mod_rewrite, 'flush_rewrite_rules')); register_deactivation_hook( __FILE__, array($custom_mod_rewrite, 'flush_rewrite_rules')); add_action('generate_rewrite_rules', array($custom_mod_rewrite, "generate_rewrite_rules")); class
KickExam Pvt. Ltd.
custom_mod_rewrite { function __construct() { $this->wp_rewrite = & $GLOBALS["wp_rewrite"]; } function mod_rewrite_rules($rules) { return preg_replace('#^(RewriteRule \^.*/)\?\$plugin_name .*(http://.*) \[QSA,L\]#mi', '$1 $2 [R=301,L]', $rules); } }
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412.
Which of the following code snippets can be used to create custom POST status in wordpress 3.0 +?
register_new_post()
register_post_status()
add_new_post_status()
modify_post_status()
Answer
Correct Answer:
register_post_status()
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413.
Which of the following is an example of a WordPress plugin that provides multilingual capabilities?
WP Super Cache
qTranslate
BuddyPress
Hotfix
Answer
Correct Answer:
qTranslate
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414.
Which of the following commands can change the ownership of WordPress directory to www-data (for Apache)?
sudo chown -Rf www-data *
chown -Rf www-data *
sudo crown -Df www-data *
Alldo chown -Rf www-data *
Answer
Correct Answer:
sudo chown -Rf www-data *
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415.
Which of the following is the correct way to print the slug property of $firstTag object in this code snippet? $tags = wp_get_post_tags($post->ID); $firstTag = $tags[0];
$firstTag[‘slug’];
$firstTag->slug
$firstTag.slug
$firstTag[0][‘slug’]
Answer
Correct Answer:
$firstTag->slug
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416.
Which of the following is the correct way to redirect the default login and registration page URL to a custom login and registration page URL?
add_action('init','possibly_redirect'); function possibly_redirect(){ global $pagenow; if( 'wp-login.php' == $pagenow ) { return('Your custom url'); exit(); } }
add_action('init','possibly_redirect'); function possibly_redirect(){ global $pagenow; if( 'wp-login.php' == $pagenow ) { wp_redirect('Your custom url'); exit(); } }
dd_action('init','possibly_redirect'); function possibly_redirect(){ global $pagenow; if( 'wp-login.php' == $pagenow ) { redirect('Your custom url'); exit(); } }
add_action('init','possibly_redirect'); function possibly_redirect(){ global $pagenow; if( 'wp-login.php' == $pagenow ) { wp_return('Your custom url'); exit(); } }
Answer
Correct Answer:
add_action('init','possibly_redirect'); function possibly_redirect(){ global $pagenow; if( 'wp-login.php' == $pagenow ) { wp_redirect('Your custom url'); exit(); } }
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417.
What does a "for...in" loop do?
It iterates over the enumerable properties of an object, in arbitrary order.
It iterates over the enumerable properties of an string, in arbitrary order.
It iterates over the enumerable properties of an intenger, in arbitrary order.
It iterates over the enumerable properties of an function, in arbitrary order.
Answer
Correct Answer:
It iterates over the enumerable properties of an object, in arbitrary order.
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418.
Consider the following code: var setter=new Object() setter.color="blue" How would you delete the color property of the variable seter?
setter.color delete;
delete setter.color
delete(setter.color)
setter.color.delete
Answer
Correct Answer:
delete setter.color
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419.
Which of the following is the best way to show both single and double quotes in the same sentence?
alert("It's "+'"game"'+" time.");
alert('It\'s \"game\" time.');
alert('It\'\s "game" time.');
alert('It\'s "game" time.');
Answer
Correct Answer:
alert('It\'s "game" time.');
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420.
Which of the following is not a valid code for redirect to stackoverflow.com?
window.location.href = "http://stackoverflow.com";
window.location.href ("http://stackoverflow.com");
window.location.replace="http://stackoverflow.com";
window.location.replace("http://stackoverflow.com");
Answer
Correct Answer:
window.location.replace="http://stackoverflow.com";
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421.
Which of the following are JavaScript unit testing tools?
Buster.js, jQuery, YUI Yeti
QUnit, Modernizr, JsTestDriver
Node.js, Modernizr, Jasmine
Buster.js, YUI Yeti, Jasmine
Answer
Correct Answer:
Buster.js, YUI Yeti, Jasmine
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422.
Which of the following code snippets returns "[object object]"?
<script> var o = new Object(); o.toSource(); </script>
<script> var o = new Object(); o.valueOf(); </script>
<script> var o = new Object(); o.toString(); </script>
<script> var o = new Object(); o.getName(); </script>
Answer
Correct Answer:
<script> var o = new Object(); o.toString(); </script>
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423.
What is the cleanest, most effective way to validate decimal numbers in JavaScript?
IsNumeric()
isNaN()
valid()
isDecimal()
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424.
Which of the following modifiers must be set if the JavaScript lastIndex object property was used during pattern matching?
i
m
g
s
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425.
Which of the following code snippets shows the correct way to detect an array that does not contain a specific value?
script>
var aVar = ["Banana", "Orange", "Apple", "Mango"];
var bVar = fruits.indexOf("Lichi")
if(bVar == 1){
//requirement
}
</script>
<script>
var aVar = ["Banana", "Orange", "Apple", "Mango"];
var bVar = fruits.valueOf("Lichi")
if(bVar == -1){
//requirement
}
</script>
<script>
var aVar = ["Banana", "Orange", "Apple", "Mango"];
var bVar = fruits.indexOf("Lichi")
if(bVar == -1){
//requirement
}
</script>
<script>
var aVar = ["Banana", "Orange", "Apple", "Mango"];
var bVar = fruits.valueOf("Lichi")
if(bVar == 1){
//requirement
}
</script>
Answer
Correct Answer:
<script>
var aVar = ["Banana", "Orange", "Apple", "Mango"];
var bVar = fruits.valueOf("Lichi")
if(bVar == -1){
//requirement
}
</script>
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426.
Which of the following will correctly detect browser language preference?
var language = window.navigator.userLanguage || window.navigator.language; alert(language);
var language = navigator.browserLanguage || window.navigator.language; alert(language);
var language = navigator.userLanguage; alert(language);
var language = window.navigator.language; alert(language);
Answer
Correct Answer:
var language = window.navigator.language; alert(language);
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427.
Which of the following code snippets will correctly detect a touchscreen device?
function isTouchDevice() { return !!('ontouchstart' in window) || !!('onmsgesturechange' in window); };
function isTouchDevice() { try { document.body.createEvent("TouchEvent"); return true; } catch (e) { return false; } }
function isTouchDevice(){ return (typeof(navigator.ontouchstart) != 'undefined') ? true : false; }
function isTouchDevice(){ return (navigator.msMaxTouchPoints == 0); }
Answer
Correct Answer:
function isTouchDevice() { return !!('ontouchstart' in window) || !!('onmsgesturechange' in window); };
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428.
Which of the following choices is the correct way to create an XML object in E4X? A. var languages = new XML('JavaScriptPython'); B. var languages XML = new XML('JavaScriptPython'); C. var languages = JavaScript Python ;
A
B
C
A, B, and C
A and C
B and C
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429.
What is the output of the following code? var obj = { "first":"first", "2":"2", "34":"34", "1":"1", "second":"second" }; for (var i in obj) { alert(i); };
"1", "2", "34", "first", "second"
"first", "1", "2", "34", "second"
"first", "2", "34", "1", "second"
"first", "second", "1", "2", "34",
Answer
Correct Answer:
"1", "2", "34", "first", "second"
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430.
When toggling a variable, its cycle must be 0 and 1. When the variable's active value is 0, the next value should be 1, and when the variable's active value is 1, the next value should be 0. Considering the scenario above, which of the following is correct?
q = (q == 1 ? 1 : 0);
q = 1 - q;
q ^= 0;
q = inv(0);
Answer
Correct Answer:
q = 1 - q;
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431.
Which of the following is not a JavaScript string method?
ep
split
subst
slice
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432.
Consider the following code snippet: <form name="frmOne"> <select name="selList" size="1" onChange="change()"> <option value="http://www.hotmail.com">tHomail</option> <option value="http://www.yahoo.com">Yahoo</option> </select> </form> Considering that when an option button is selected, the appropriate website should be opened immediately, what should the change() function look like?
url=document.frmOne.selList.options[document.frmOne.selList..item].value
url=document.frmOne.selList.options[document.frmOne.selList.selectedIndex].value
ocation=document.frmOne.selList.options[document.frmOne.selList.item].value.value
location=document.frmOne.selList.options[document.frmOne.selList.selectedIndex].value
Answer
Correct Answer:
location=document.frmOne.selList.options[document.frmOne.selList.selectedIndex].value
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433.
Which of the following built-in functions is used to access form elements using their IDs?
getItem(id)
getFormElement(id)
getElementById(id)
All of these
Answer
Correct Answer:
getElementById(id)
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434.
Which of the following options is used to access the attributes in E4X?
@
::
#
*
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435.
An HTML form contains 10 checkboxes all named "chkItems". Which JavaScript function can be used for checking all the checkboxes together?
function CheckAll() { for (z = 0; z < document.forms.chkItems.length; z++) { document.forms.chkItems[z].checked=true } }
function CheckAll() { for (z = 0; z < document.forms[0].chkItems.length; z++) { document.forms[0].chkItems[z].checked=true } }
function CheckAll() { for (z = 0; z < document.forms[0].chkItems.length; z++) { document.forms[0].chkItems.list[z].checked=true } }
function CheckAll() { for (z = 0; z < document.forms[0].chkItems.length; z++) { document.forms[0].chkItems.list[z].checked=false } }
Answer
Correct Answer:
function CheckAll() { for (z = 0; z < document.forms[0].chkItems.length; z++) { document.forms[0].chkItems[z].checked=true } }
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436.
Why does Google prepend while(1); to their JSON responses?
It prevents JSON hijacking.
It prevents eval() from rogue scripts from being run on their JSON responses.
Google doesn't prepend while(1); to their JSON responses.
Answer
Correct Answer:
It prevents JSON hijacking.
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437.
Which of the following can be used for disabling the right click event in Internet Explorer?
event.button == 2
event.button == 4
event.click == 2
event.click == 4
Answer
Correct Answer:
event.button == 2
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438.
Which of following uses the "with" statement in JavaScript correctly?
with (document.getElementById("blah").style) { background = "black"; color = "blue"; border = "1px solid green"; }
with document.getElementById("blah").style background = "black"; color = "blue"; border = "1px solid green"; End With
With document.getElementByName("blah").style background = "black"; color = "blue"; border = "1px solid green"; End With
with (document.getElementById("blah").style) { .background = "black"; .color = "blue"; .border = "1px solid green"; }
Answer
Correct Answer:
with (document.getElementById("blah").style) { background = "black"; color = "blue"; border = "1px solid green"; }
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439.
Which of the following 'if' statements is correctly used to get the size of both 'variable1' and 'variable2' objects? var variable1 = {'name':'theName', 'address':'theAddress','age': '18'} var variable2 = ['theName','theAddress','18']; variable1["name"] = "theName2"; variable1["name"] = "theName3"; variable1["name2"] = "theName4"; variable1["name2"] = "theName5"; Object.size = function(importer) { var exporter = 0, key; for (key in importer) { if (importer.hasOwnProperty(key)) exporter++; } return exporter; };
if(typeof(variable1)=='object' && typeof(variable2)=='array'){ Object.size(variable1); variable2.length; }
if(typeof(variable1)=='array' && typeof(variable2)=='object'){ Object.size(variable1); variable2.length; }
if(typeof(variable1) > typeof(variable2)){ Object.size(variable1); variable2.length; }
if(typeof(variable1) == typeof(variable2)){ Object.size(variable1); variable2.length; }
Answer
Correct Answer:
if(typeof(variable1) == typeof(variable2)){ Object.size(variable1); variable2.length; }
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440.
Which of the following will correctly check if a variable is undefined in JavaScript?
if (typeof something === "undefined")
if (typeof something == "undefined")
if (typeof something === undefined)
if (typeof something == undefined)
Answer
Correct Answer:
if (typeof something === "undefined")
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441.
Which of the following is a good reason why JavaScript variables would start with a dollar sign ($)?
$ is a prefix used to create a instance of a object.
$ is a keyword in JavaScript.
$ is used to quickly identify and parse variables.
None of these.
Answer
Correct Answer:
None of these.
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442.
What is the difference between call() and apply()?
The call() function accepts an argument list of a function, while the apply() function accepts a single array of arguments.
The apply() function accepts an argument list of a function, while the call() function accepts a single array of arguments.
The call() function accepts an object list of a function, while the apply() function accepts a single array of an object.
The call() function accepts an object list of a function, while the apply() function accepts a single array of an object.
Answer
Correct Answer:
The call() function accepts an argument list of a function, while the apply() function accepts a single array of arguments.
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443.
Which of the following is/are true regarding JavaScript and multi-threading/concurrency?
JavaScript is single-threaded, forcing asynchronous events to a queue to wait for execution.
JavaScript is multi-threaded, and behaves in a synchronous manner.
Script can be single or multi-threaded, depending on the browser's capabilities.
None of these.
Answer
Correct Answer:
JavaScript is single-threaded, forcing asynchronous events to a queue to wait for execution.
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444.
Which of the following code snippets will trigger an input type="file" attribute when an element with a "newbtn" ID is clicked? <button id"newbtn" onclick="grt();">Upload</button> <form> <input id="thisId" type="file" name="upload" /> </form> </form>
function grt(){document.getElementById('thisId').keypress();}
function grt(){document.getElementById('thisId').load();}
function grt(){document.getElementById('thisId').dblclick();}
function grt(){document.getElementById('thisId').click();}
Answer
Correct Answer:
function grt(){document.getElementById('thisId').click();}
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445.
Which of the following will determine if the user's browser is named "Netscape"?
if(appName=="Netscape"){}
if(document.appName=="Netscape"){}
if(navigator=="Netscape"){}
if(browser=="Netscape"){}
None of these
Answer
Correct Answer:
None of these
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446.
Which of the following is used to solve the problem of enumerations in JavaScript?
let
Regex
Generators
E4X
Answer
Correct Answer:
Generators
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447.
Which of following is an invalid function declaration?
function () {}
function () {}()
!function () {}()
(function () {})()
Answer
Correct Answer:
(function () {})()
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448.
Which of the following is not a valid JavaScript operator?
|
===
%=
^
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449.
Which of the following is the best reason for not using "for...in" with array iteration?
for..in should be used to iterate over an array where index order is important.
for..in should not be used to iterate over an array where index order is important.
for...in loops iterate over non–enumerable properties.
for...in loops do not iterate over enumerable properties.
Answer
Correct Answer:
for..in should not be used to iterate over an array where index order is important.
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450.
The following functions are for encoding URL parameters in Javascript. Which function escape converts non-ASCII characters into its Unicode escape sequences, like %uxxx?
escape()
encodeURI()
encodeURIComponent()
encodeURL()
Answer
Correct Answer:
encodeURI()
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451.
Which of the following can be used to write a JavaScript function that will accept user input?
The prompt method
The alert method
A form field
All of these
Answer
Correct Answer:
The prompt method
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452.
Given a p element with some text content, which of the following code snippets sets the background color of the text to yellow, its color to red, and its font size to 20px?
var p = document.getElementById(elementId); p.setAttribute("style", "background-color:yellow;color:red;font-size:20px;");
var p = document.getElementById(elementId); p.style.background = 'yellow'; p.style.color= 'red'; p.style.size= '20px';
var p = document.getElementById(elementId); p.style.background = 'yellow'; p.style.color= 'red'; p.style.font.size= '20px';
var p = document.getElementById(elementId); p.setAttribute("style", "background-color:red;color:yellow;font-size:20;");
Answer
Correct Answer:
var p = document.getElementById(elementId); p.setAttribute("style", "background-color:yellow;color:red;font-size:20px;");
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453.
Which of the following shortcuts can be used for writing multiple document.write statements?
for(document){}
with(document) {}
withThis(document){}
None of these
Answer
Correct Answer:
with(document) {}
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454.
Which of the following will include a JavaScript file in another JavaScript file?
Adding a script tag with the script URL in the HTML
Loading it with an AJAX call then using eval
Using 'import' operator
Using 'include' operator
Answer
Correct Answer:
Loading it with an AJAX call then using eval
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455.
Which of the following is not a valid method for looping an array?
var a= [1,2]; for (var i = 0; i < a.length; i++) { alert(a[i]); }
var a= [1,2]; a.forEach( function(item) { alert(item); })
var a= [1,2]; a.map( function(item) { alert(item); })
var a= [1,2]; a.loop( function(item) { alert(item); })
Answer
Correct Answer:
var a= [1,2]; a.loop( function(item) { alert(item); })
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456.
Which of the given options represents the correct length when alert(Emp..*.length()); is applied to the following code?
var Emp = <Emp>
<name>Mark</name>
<likes>
<os>Linux</os>
<browser>Firefox</browser>
<language>JavaScript</language>
<language>Python</language>
</likes>
</Emp>
11
5
6
12
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457.
Given the following window.open function: window.open(url,name,"attributes") How can it be ensured that different URLs are opened in the same window?
The second attribute, name, should be the same.
The name attribute should be null.
The name attribute should be omitted.
The name attribute should be different.
None of these.
Answer
Correct Answer:
None of these.
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458.
What would be the default setting for the expires attribute of the document.cookie property?
The duration of the browser session
The duration the current document stays loaded
Twenty-four hours from the time the cookie is set
There is no default setting
The duration for which the machine is on
Answer
Correct Answer:
The duration of the browser session
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459.
What does the following JavaScript code do? contains(a, obj) { for (var i = 0; i < a.length; i++) { if (a[i] === obj) { return true; } } return false; }
It calculates an array's length.
It compares 'a' and 'obj' in an array.
The code will cause an error.
It checks if an array contains 'obj'.
Answer
Correct Answer:
It checks if an array contains 'obj'.
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460.
Consider the following code: <form> <textarea id="foo" name="foo"></textarea> </form> Which of the following is the best method to get the line number of the form's text area?
<script> foo.value.split(/\r\n\|\r\|\n/g); </script>
<script> foo.value.split(/\r\/n\|\r\|\n/g); </script>
<script> foo.value.split(/\rn\|\r\|\n/g); </script>
<script> foo.value.split(/\r\n|\r|\n/g); </script>
Answer
Correct Answer:
<script> foo.value.split(/\r\n|\r|\n/g); </script>
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461.
Which of the following statements are true regarding the code below?
<script>
alert("foo" === new String("foo")); // output false
</script>
The "===" operator always returns false.
The "===" operator returns true only if they refer to the same object (comparing by reference) and if both the primitive and the object have the same value.
The "===" operator returns true only if the object (comparing by reference) and the primitive have the same value.
The "===" operator does not work for objects.
Answer
Correct Answer:
The "===" operator returns true only if they refer to the same object (comparing by reference) and if both the primitive and the object have the same value.
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462.
Which of the following is incorrect regarding Strict mode in JavaScript?
It catches some common coding errors, throwing exceptions.
It enables features that are confusing or poorly thought out.
It prevents, or throws errors, when relatively "unsafe" actions are taken (such as gaining access to the global object).
Answer
Correct Answer:
It enables features that are confusing or poorly thought out.
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463.
Choose another way to write x ? a = b : a = c
if ('x') { a = b; } else { a = c; }
if (x) { a = c; } else { a = b; }
x : a = c ? a =
None of above
Answer
Correct Answer:
if ('x') { a = b; } else { a = c; }
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464.
Which of the following statements regarding this String prototype is correct? String.prototype.doSomething = function(suffix) { return this.indexOf(suffix, this.length - suffix.length) !== -1; };
This method determines whether or not a string ends with another string.
This method determines whether or not a string begins with another string.
This method returns the position of the last occurrence of a specified value in a string.
This method returns the position of the first occurrence of a specified value in a string.
Answer
Correct Answer:
This method determines whether or not a string ends with another string.
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465.
How can the user's previously navigated page be determined using JavaScript?
It is not possible in JavaScript. This can be done only through server-side scripting.
Using the document.referrer property
Using the window object
None of these
Answer
Correct Answer:
Using the document.referrer property
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466.
Is the following statement regarding expression closures in JavaScript true or false? The syntax function(x) {return x*x;} can be written as function(x) x*x.
True
False
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467.
Which event can be used to validate the value in a field as soon as the user moves out of the field by pressing the tab key?
onblur
onfocus
lostfocus
gotfocus
None of these
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468.
Which of the following is not a valid Date Object method in JavaScript?
parse()
setDay()
setTime()
valueOf()
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469.
What does the + sign in front of a function name mean in JavaScript?
It forces the parser to treat the + sign as a part of an expression.
The + sign is used as a cast operator.
It is used to denote a type of object in JavaScript.
None of these.
Answer
Correct Answer:
It forces the parser to treat the + sign as a part of an expression.
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470.
Which of the following is true about setTimeOut()?
The statement(s) it executes run(s) only once.
It pauses the script in which it is called.
clearTimeOut() won't stop its execution.
The delay is measured in hundredths of a second.
It is required in every JavaScript function.
Answer
Correct Answer:
The statement(s) it executes run(s) only once.
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471.
Which is the top most object in the object hierarchy?
document
window
history
browse
form
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472.
Which of the following code snippets will return all HTTP headers?
var req = new XMLHttpRequest(); req.open('GET', document.location, false); req.send(null); var headers = req.getAllResponseHeaders().toLowerCase(); alert(headers);
var req = new XMLHttpAccess(); req.open('GET', document.location, false); req.send(null); var headers = req.getAllResponseHeaders().toLowerCase(); alert(headers);
var req = new XMLHttpRequest(); req.open('GET', document.location, false); req.send(null); var headers = req.getResponseHeader().toLowerCase(); alert(headers);
var req = new XMLHttpRequestHeader(); req.open('GET', document.location, false); req.send(null); var headers = req.retrieveAllResponseHeaders().toLowerCase(); alert(headers);
Answer
Correct Answer:
var req = new XMLHttpRequest(); req.open('GET', document.location, false); req.send(null); var headers = req.getAllResponseHeaders().toLowerCase(); alert(headers);
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473.
Which of these options is the most maintainable way to attach JavaScript functionality to an HTML element?
<p onclick="alert('You clicked me!')">some text</p>
<script>function fun(){alert('You clicked me!')}</script> <a onclick=fun()>...</a>
<script> function fun(){ alert('You clicked me!'); }; var el = document.getElementById("click-target"); el.onClick = fun; </script> <a id="click-target">...</a>
<a href="javascript:alert('You clicked me!')">...</a>
Answer
Correct Answer:
<script>function fun(){alert('You clicked me!')}</script> <a onclick=fun()>...</a>
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474.
What does the following code snippet do?
<input type="radio" name="r1" value="radio1" onclick="this.checked=false;alert('sorry')" />
The code is invalid.
The code makes it necessary for the user to select the radio button.
The code disables the radio button.
The code displays an alert when the user selects the button.
Answer
Correct Answer:
The code displays an alert when the user selects the button.
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475.
What will be the result of the following code? document.getElementById("banana").className = document.getElementById("banana").className.replace( /(?:^|\s)apple(?!\S)/g ,'e' );
Replace class ‘apple’ with ‘g’ in the HTML element which contains ID ‘banana’
Replace current class with ‘apple’ in the HTML element which contains ID ‘banana’
Replace class ‘apple’ with ‘e’ in the HTML element which contains ID ‘banana’
Replace ID ‘apple’ with ‘banana’ in the HTML element which contains ID ‘banana’ and class ‘g’
Answer
Correct Answer:
Replace class ‘apple’ with ‘e’ in the HTML element which contains ID ‘banana’
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476.
Which of the following code snippets will correctly get the length of an object?
<script> var newObj = new Object(); newObj["firstname"] = "FirstName"; newObj["lastname"] = "LastName"; newObj["age"] = 21; Object.size = function(obj) { var size = 0, key; for (key in obj) { if (obj.hasOwnProperty(index)) size++; } return size; }; var size = Object.size(newObj); </script>
<script> var newObj = new Object(); newObj["firstname"] = "FirstName"; newObj["lastname"] = "LastName"; newObj["age"] = 21; Object.size = function(obj) { var size = 0, key; for (key in obj) { if (obj.hasOwnProperty(value)) size++; } return size; }; var size = Object.size(newObj); </script>
<script> var newObj = new Object(); newObj["firstname"] = "FirstName"; newObj["lastname"] = "LastName"; newObj["age"] = 21; Object.size = function(obj) { var size = 0, key; for (key in obj) { if (obj.hasOwnProperty(length)) size++; } return size; }; var size = Object.size(newObj); </script>
<script> var newObj = new Object(); newObj["firstname"] = "FirstName"; newObj["lastname"] = "LastName"; newObj["age"] = 21; Object.size = function(obj) { var size = 0, key; for (key in obj) { if (obj.hasOwnProperty(key)) size++; } return size; }; var size = Object.size(newObj); </script>
Answer
Correct Answer:
<script> var newObj = new Object(); newObj["firstname"] = "FirstName"; newObj["lastname"] = "LastName"; newObj["age"] = 21; Object.size = function(obj) { var size = 0, key; for (key in obj) { if (obj.hasOwnProperty(key)) size++; } return size; }; var size = Object.size(newObj); </script>
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477.
Which of the following code snippets shows an alert for an empty string? var a = "";
If(a){ alert(‘This is empty string’);}
If(a == NUL){ alert(‘This is empty string’);}
If(!a){ alert(‘This is empty string’);}
If(a.empty){ alert(‘This is empty string’);}
Answer
Correct Answer:
If(!a){ alert(‘This is empty string’);}
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478.
In JavaScript, the encodeURI() function is used to encode special characters. Which of the following special characters is/are an exception to that rule? A. £ B. € C. @ D. $
A
B
C
D
A and B
C and D
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479.
Which of the following code snippets will toggle a div element's background color? <button id="toggle">Toggle</button> <div id="terd">Change Background Color.</div>
<script> var button = document.getElementById('toggle'); button.click = function() { terd.style.backgroundColor = terd.style.backgroundColor == 'blue' ? 'red' : 'blue'; }; </script>
<script> var button = document.getElementById('toggle'); button.ready = function() { terd.style.backgroundColor = terd.style.backgroundColor == 'blue' ? 'red' : 'blue'; }; </script>
<script> var button = document.getElementById('toggle'); button.focus = function() { terd.style.backgroundColor = terd.style.backgroundColor == 'blue' ? 'red' : 'blue'; }; </script>
<script> var button = document.getElementById('toggle'); button.onclick = function() { terd.style.backgroundColor = terd.style.backgroundColor == 'blue' ? 'red' : 'blue'; }; </script>
Answer
Correct Answer:
<script> var button = document.getElementById('toggle'); button.onclick = function() { terd.style.backgroundColor = terd.style.backgroundColor == 'blue' ? 'red' : 'blue'; }; </script>
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480.
What would be the use of the following code? function validate(field) { var valid=''ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz''; var ok=''yes''; var temp; for(var i=0;i<field.value.length;i++) { temp='''' + field.value.substring(i,i+1) if(valid.indexOf(temp)==''-1'') { ok=''no''; } } if(ok==''no'') { alert(''error''); field.focus(); } }
It will force a user to enter only numeric values.
It will force a user to enter only alphanumeric values.
It will force a user to enter only English alphabet character values.
None of these.
Answer
Correct Answer:
It will force a user to enter only English alphabet character values.
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481.
Which of the following statements is correct?
There is no undefined property in JavaScript.
Undefined object properties can be checked using the following code: if (typeof something == null) alert("something is undefined");
It is not possible to check for undefined object properties in JavaScript.
Undefined object properties can be checked using the following code: if (typeof something === "undefined") alert("something is undefined");
Answer
Correct Answer:
Undefined object properties can be checked using the following code: if (typeof something === "undefined") alert("something is undefined");
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482.
In an HTML page, the form tag is defined as follows:
<form onsubmit="return Validate()" action="http://www.mysite.com/">
The validate() function is intended to prevent the form from being submitted if the name field in the form is empty. What should the validate() function look like?
<script type="text/javascript"> function Validate() { if(document.forms[0].name.value == "") return true; else return false; } </script>
<script type="text/javascript"> function Validate() { if(document.forms[0].name.value == "") return false; else return true; } </script>
script type="text/javascript"> function Validate() { if(document.forms[0].name== "") return false; else return true; } </script>
<script type="text/javascript"> function Validate() { if(document.forms[0].name == "") return true; else return false; } </script>
Answer
Correct Answer:
<script type="text/javascript"> function Validate() { if(document.forms[0].name.value == "") return false; else return true; } </script>
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483.
Consider the following JavaScript validation function:
function ValidateField()
{
if(document.forms[0].txtId.value =="")
{return false;}
return true;
}
Which of the following options will call the function as soon as the user leaves the field?
input name=txtId type="text" onreset="return ValidateField()"
input name=txtId type="text" onfocus="return ValidateField()"
input name=txtId type="text" onsubmit="return ValidateField()"
input name=txtId type="text" onblur="return ValidateField()"
Answer
Correct Answer:
input name=txtId type="text" onblur="return ValidateField()"
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484.
Which of the following will list the properties of a JavaScript object?
var keys = Object.keys(myJsonObject);
var keys = Object.value(myJsonObject)
var keys = Object.keys(myJsonValue)
None of these
Answer
Correct Answer:
var keys = Object.keys(myJsonObject);
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485.
Which of the following statements are true regarding the "this" keyword in JavaScript?
The value of "this" can be set by assignment during execution, and it will be the same each time the function is called.
Inside a function, the value of "this" depends on how many times the function is called.
Inside a function, the value of "this" depends on how the function is called (as a simple call, an object method, a constructor, etc.).
In strict mode, the value of "this" may change from whatever it is set to, when entering the execution context.
Answer
Correct Answer:
Inside a function, the value of "this" depends on how the function is called (as a simple call, an object method, a constructor, etc.).
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486.
What would be the value of 'ind' after execution of the following code? var msg="Welcome to ExpertRating" var ind= msg.substr(3, 3)
lco
com
ome
Welcome
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487.
Which of the following choices will change the source of the image to "image2.gif" when a user clicks on the image?
img id="imageID" src="image1.gif" width="50" height="60" onmousedown="changeimg(image1.gif)" onmouseup="changeimg(image2.gif)"
img id="imageID" src="image1.gif" width="50" height="60" onmouseclick="changeimg(image2.gif)" onmouseup="changeimg(image1.gif)"
img id="imageID" src="image2.gif" width="50" height="60" onmousedown="changeimg(image1.gif)" onmouseup="changeimg(image2.gif)"
img id="imageID" src="image2.gif" width="50" height="60" onmousedown="changeimg(image2.gif)" onmouseup="changeimg(image1.gif)"
img id="imageID" src="image1.gif" width="50" height="60" onmousedown="changeimg('image2.gif')" onmouseup="changeimg('image1.gif')"
Answer
Correct Answer:
img id="imageID" src="image1.gif" width="50" height="60" onmousedown="changeimg('image2.gif')" onmouseup="changeimg('image1.gif')"
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488.
How can properties be added to an object class?
With the prototype() method
With the prototype property
It cannot be done.
With the "this" object
Answer
Correct Answer:
With the prototype property
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489.
Which of the following is the correct way to stop setInterval() from calling a function in JavaScript?
setInterval() returns an interval ID, which can pass to clearInterval() to stop it from calling its designated function.
Cannot stop the setInterval() from calling its designated function.
Stopping setInterval() is browser-dependent; some browsers support stopping setInterval(), others don't.
None of these.
Answer
Correct Answer:
setInterval() returns an interval ID, which can pass to clearInterval() to stop it from calling its designated function.
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490.
Which of the following will implement a singleton pattern in JavaScript?
<script> var anObject = { method1: function () { // ... }, method2: function () { // ... } }; </script>
<script> function method1(){ // ... } function method2(){ // ... } </script>
<script> var method1 = function(){ // ... } var method2 = function(){ // ... } </script>
<script> var method1; var method2; </script>
Answer
Correct Answer:
<script> var anObject = { method1: function () { // ... }, method2: function () { // ... } }; </script>
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491.
Which of the following determines whether cookies are enabled in a browser or not?
(navigator.Cookie)? true : false
(application.cookieEnabled)? true : false
(navigator.cookieEnabled)? true : false
(application.cookie)? true : false
Answer
Correct Answer:
(navigator.cookieEnabled)? true : false
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492.
Which of the following correctly sets a class for an element?
document.getElementById(elementId).className = "Someclass";
document.getElementById(elementId).setAttribute("className", "Someclass");
document.getElementById(elementId).class = "Someclass";
document.getElementById(elementId).style = "Someclass";
Answer
Correct Answer:
document.getElementById(elementId).className = "Someclass";
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493.
Which object can be used to manipulate the user's list of visited URLs?
document
window
history
browse
form
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494.
Which of the following correctly uses a timer with a function named rearrange()?
tmr=setTimeout("rearrange ()",1)
tmr=Timer(1,"rearrange ()")
tmr=Timer("rearrange ()",1)
tmr=setTimeout(1,"rearrange ()")
Answer
Correct Answer:
tmr=setTimeout("rearrange ()",1)
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495.
Which of the following can be used to escape the ' character?
*
\
-
@
#
%
|
~
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496.
Which of the following can be used to determine which page of the website has been most recently modified?
document
window
history
browse
form
location
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497.
Consider the following JavaScript function to change the color of the text box named txtName: function color(col) { document.forms[0].txtName.style.background=col } Which of the following will change the color of the text box to green, as long as the user is pressing a key?
input type="text" onkeydown="color('white')" onkeyup="color('green')" name="txtName"
input type="text" onkeydown="color('green')" onkeyup="color('white')" name="txtName"
input type="text" onkeydown="color('green')" name="txtName"
input type="text" onkeydown="color('white')" name="txtName"
input type="text" onkeypress="color('green')" onkeyup="color('white')" name="txtName"
Answer
Correct Answer:
input type="text" onkeydown="color('green')" onkeyup="color('white')" name="txtName"
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498.
Which of the following choices will remove a selection option from the code below? <button id"newbtn" onclick="g();">Remove</button> <select name="selectBox" id="selectBox"> <option value="option1">option1</option> <option value="option2">option2</option> <option value="option3">option3</option> <option value="option4">option4</option> </select>
<script> function g(){ var index = 1; var d = document.getElementById("selectBox"); var d_nested = d.childNodes[index]; var throwawayNode = d.deleteChild(d_nested); } </script>
<script> function g(){ var index = 1; var d = document.getElementById("selectBox"); var d_nested = d.childNodes[index]; var throwawayNode = d.clearChild(d_nested); } </script>
<script> function g(){ var index = 1; var d = document.getElementById("selectBox"); var d_nested = d.childNodes[index]; var throwawayNode = d.emptyChild(d_nested); } </script>
<script> function g(){ var index = 1; var d = document.getElementById("selectBox"); var d_nested = d.childNodes[index]; var throwawayNode = d.removeChild(d_nested); } </script>
Answer
Correct Answer:
<script> function g(){ var index = 1; var d = document.getElementById("selectBox"); var d_nested = d.childNodes[index]; var throwawayNode = d.removeChild(d_nested); } </script>
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499.
Which of the following statements is true regarding importing JavaScript files inside of other JavaScript files?
There is no import/include/require keyword in JavaScript, but there ways to import JS files inside of other JS files.
There is an import keyword in JavaScript, which allows importing JS files inside of other JS files.
There is no option to do so in JavaScript.
Answer
Correct Answer:
There is no option to do so in JavaScript.
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500.
Which of the following options can be used for adding direct support for XML to JavaScript?
E4X
Regex
Generators and Iterators
let
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501.
Analyze the following code snippet which uses a Javascript Regular Expression character set. What will be the output of this code?
<html>
<body>
<script type="text/javascript">
var str = "Is this enough?";
var patt1 = new RegExp("[^A-J]");
var result = str.match(patt1);
document.write(result);
</script>
</body>
</html>
I
Is
s
I,s,
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502.
How can created cookies be deleted using JavaScript?
They can't be deleted. They are valid until they expire.
Overwrite with an expiry date in the past
Use escape() on the value of the path attribute
Use unescape() on the value of the path attribute
The cookie file will have to be removed from the client machine.
Wait till the expiry date is reached
Answer
Correct Answer:
Overwrite with an expiry date in the past
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503.
An image tag is defined as follows:
<img id="ERImage" width="100" height="100" onmouseover="ImageChange()" src="Image1.jpg">
The purpose of the ImageChange() function is to change the image source to Image2.jpg. Which of the following should the ImageChange() function look like?
document.getElementById('ERImage').src="Image1.jpg"
document.getElementById('ERImage').src="Image2.jpg"
document.getElementById('ERImage').style.src="Image1.jpg"
document.getElementById('ERImage').style.src="Image2.jpg"
Answer
Correct Answer:
document.getElementById('ERImage').src="Image2.jpg"
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504.
Which of the following will check whether the variable vRast exists or not?
if (typeof vRast="undefined") {}
if (typeof vRast =="undefined") {}
if (vRast.defined =true) {}
if (vRast.defined ==true) {}
Answer
Correct Answer:
if (typeof vRast =="undefined") {}
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505.
Which of the following code snippets changes an image on the page?
var img = document.getElementById("imageId"); img.src = "newImage.gif";
var img = document.getElementById("imageId"); img.style.src = "newImage.gif";
var img = document.getElementById("imageId"); img.src.value = "newImage.gif";
var img = document.getElementById("imageId"); img = "newImage.gif";
Answer
Correct Answer:
var img = document.getElementById("imageId"); img.src = "newImage.gif";
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506.
Consider the following variable declarations: var a="adam" var b="eve" Which of the following would return the sentence "adam and eve"?
a.concatinate("and", b)
a.concat("and", b)
a.concatinate(" and ", b)
a.concat(" and ", b)
Answer
Correct Answer:
a.concat(" and ", b)
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507.
How can the operating system of the client machine be detected?
It is not possible using JavaScript.
Using the navigator object
Using the window object
Using the document object
None of these.
Answer
Correct Answer:
Using the navigator object
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508.
How can a JavaScript object be printed?
console.log(obj)
console.print(obj)
console.echo(obj);
None of these
Answer
Correct Answer:
console.log(obj)
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509.
When setting cookies with JavaScript, what will happen to the cookies.txt data if the file exceeds the maximum size?
The script automatically generates a run-time error.
The script automatically generates a load-time error.
All processes using document.cookie are ignored.
The file is truncated to the maximum length.
Answer
Correct Answer:
The file is truncated to the maximum length.
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510.
Consider the following image definition:
Which of the following will change the image to companylogo2.gif when the page loads?
Location
Window
Screen
Navigator
Answer
Correct Answer:
Navigator
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511.
Which of the following objects in JavaScript contains the collection called "plugins"?
Location
Window
Screen
Navigator
Answer
Correct Answer:
Navigator
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512.
Consider the following code snippet: var myJSONObject = {"ircEvent": "PRIVMSG", "method": "newURI", "regex": "^http://.*"}; What is the best way to remove the property 'regex', so the result would be this code snippet? myJSONObject == {"ircEvent": "PRIVMSG", "method": "newURI"};
myJSONObject.regex.delete;
myJSONObject.regex.remove;
delete myJSONObject.regex;
remove myJSONObject.regex;
Answer
Correct Answer:
delete myJSONObject.regex;
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513.
The following are sample code on how to loop through JavaScript object literals with objects as members:
Var validation_messages = {
“key_1” : {
“your_msg” : “hello world”
} ,
“Key_2” : {
“your_name” : “billy”,
“your_msg” : “foo equals bar”
}
}
Which of the following are invalid native JavaScript codes?
For (var key in validation_messages) {
Var obj = validation_messages[key];
For (var prop in obj) {
Alert(prop + “ = “ + obj[prop]);
}
}
Object.keys(validation_messages).forEach(function(key) {
Var obj = validation_messages[key];
Object.keys(obj).forEach(function (key){
Alert(prop + “ = “ + obj [key] );
});
(validation_messages.hasOwnProperty(key) {
Var obj = validation_messages[key];
For (var prop in obj) {
If (obj.hasOwnproperty(prop) {
Alert (prop + “ = “ + obj [prop]);
}
}
}
}
_.each(validation_messages, function(value,key) {
_.each(value,function(value,key){
Alert(prop + “ = ” + value);
});
Answer
Correct Answer:
For (var key in validation_messages) {
Var obj = validation_messages[key];
For (var prop in obj) {
Alert(prop + “ = “ + obj[prop]);
}
}
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514.
Which of the following code snippets will correctly split “str”?
<script>
Var str = ‘something – something_else’;
Var substrn = str.split(‘--’);
</script>
<script>
Var str = ‘something – something_else’;
Var substrn = split.str(‘---’);
</script>
<script>
Var str = ‘something – something_else’;
Var substrn = str.split(‘-’ , ’-’);
</script>
<script>
Var str = ‘something – something_else’;
Var substrn = split.str(‘-’ , ‘-’);
</script>
Answer
Correct Answer:
<script>
Var str = ‘something – something_else’;
Var substrn = str.split(‘--’);
</script>
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515.
What is the output of the following code?
Var container = {
someKey: 3,
someOtherKey: “someObject”,
anotherKey: “Some text”
};
If (“someOtherKey: in container) {
Alert(true);
}
Delete container[“someOtherKey”];
If (container[“someOtherKey”] === null) {
Alert(false);
}
If (container[“someOtherKey”] === undefined) {
Alert(true);
}
If (container.someOtherKey === Undefined) {
Alert(false);
}
If (container.someKey === undefined) {
Alert(true);
}
Delete container[“someKey”];
If (container.someKey === 3) {
Alert(true);
}
True
True
False
True
True
True
True
False
True
False
True
True
True
True
False
True
Answer
Correct Answer:
True
True
False
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516.
Consider the following code:
Var vNew=new Date()
Which of the following options will return true?
vNew instanceof Boolean
vNew instanceof object
vNew instanceof Date
All of these
Answer
Correct Answer:
vNew instanceof Date
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517.
Why does (0 <5 < 3) return true?
Order of operations produces (true < 3), which returns true.
Order of precedence produces (true < 3), which returns true.
Order of operations produces (false < 3), which returns true.
None of these
Answer
Correct Answer:
Order of operations produces (true < 3), which returns true.
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518.
Which object can be used to ascertain the protocol of the current URL?
Document
Window
History
Browser
Form
location
Note: This Question is unanswered, help us to find answer for this one
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519.
Which of the following code snippets renders a button invisible?
Var button = document.getElementById(‘buttonId’);
Button.style.display=‘none’
Var button = document.getElementById(‘buttonId’);
Button.style.display=‘block’
Var button = document.getElementById(‘buttonId’);
Button.style.visibility=‘false’;
Var button = document.getElementById(‘btn’);
Button.style.visibility=‘disabled’;
Answer
Correct Answer:
Var button = document.getElementById(‘buttonId’);
Button.style.display=‘none’
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520.
Var profits=2489.8237
Which of the following code(s) produces the following output?
Output : 2489.824
Profits.toFixed(4)
Profits.toFixed(3)
Profits.formatDollar(3)
Profits.nuberFormat(3)
Answer
Correct Answer:
Profits.toFixed(3)
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521.
How does the this keyword work within a JavaScript Object literal?
<script>
Var foo = {};
Foo.someMethod = function(){
Alert(this);
}
</script>
<script>
someMethod = function(){
Alert(this);
}
</script>
<script>
Var foo = {};
someMethod.foo = function(){
Alert(this);
}
</script>
<script>
Var foo = {};
someMethod = function(foo){
Alert(this);
}
</script>
Answer
Correct Answer:
<script>
Var foo = {};
Foo.someMethod = function(){
Alert(this);
}
</script>
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522.
What is the fiinal value of the variable apt?
Var apt=2;
Apt=apt<<2;
2
4
6
8
16
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523.
Which of the following are correct closure functions?
Function foo(x) {
Var tmp = 3;
Return function (y) {
Alert(x + y + (++tmp));
}
}
Var bar = foo(2); // bar is now a closure.
Bar(10)
Function foo(x) {
Var tmp = 3;
function bar (y) {
Alert(x + y + (++tmp));
}
Bar(10);
}
foo(2)
Function foo(x) {
Var tmp = 3;
function bar (y) {
function bar1 (tmp) {
Alert(x + y + (++tmp));
}
}
Bar(10);
}
foo(2)
Function foo(x) {
Var tmp = 3;
Return function (y) {
Alert(x + y + (++tmp));
x.memb = x.memb ? x.memb + 1 : 1;
alert(x.memb);
}
}
Var age = new Number(2);
Var bar = foo(age); // bar is now a closure referencing age.
Bar(10);
Answer
Correct Answer:
Function foo(x) {
Var tmp = 3;
Return function (y) {
Alert(x + y + (++tmp));
}
}
Var bar = foo(2); // bar is now a closure.
Bar(10)
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524.
Which of the following statements about the ‘new’ keyword is incorrect?
It creates a new object.
It sets the constructor property of the object to ‘object’.
It prevents any user-defined function from being called as a constructor.
It executes a constructor function.
Answer
Correct Answer:
It prevents any user-defined function from being called as a constructor.
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525.
<a href=’http://w3.org/’ onclick=’someFunc()”; return false; ’> Click here! </a>
What does “return false” do to this onclick event?
It prevents the default browser behavior from taking place alongside someFunc().
It prevents someFunc() to run from a second click.
It prevents someFunc() from returning any values.
None of the above.
Answer
Correct Answer:
It prevents the default browser behavior from taking place alongside someFunc().
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526.
What is the purpose of while(1) in the following JSON response?
while(1);[['u',[['smsSentFlag','false'],['hideInvitations','false'],['remindOnRespondedEventsOnly','true'],['hideInvitations_remindOnRespondedEventsOnly','false_true'],['Calendar ID stripped for privacy','false'],['smsVerifiedFlag','true']]]]
It's invalid JSON code.
It makes it difficult for a third-party to insert the JSON response into an HTML document with a <script> tag.
It iterates the JSON response.
It prevents the JSON response from getting executed.
Answer
Correct Answer:
It makes it difficult for a third-party to insert the JSON response into an HTML document with a <script> tag.
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527.
Which of the following is the correct method to use, in order to know the name of both the Object and Object Class in JavaScript?
toSource()
valueOf()
toString()
getName()
Answer
Correct Answer:
toSource()
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528.
Which of the following are correct values of variable, and why?
<script>
VariableA = [6,8];
VariableB = [7,9];
variableC = variable + variable;
</script>
6, 7, 8 and 9. The + operator is defined for arrays, and it concatenates strings, so it converts the arrays to strings.
6, 15 and 9. The + operator is defined for arrays, and it concatenates numbers, so it converts the arrays to numbers.
6, 8, 7 and 9. The + operator is defined for arrays, and it concatenates strings, so it converts the arrays to strings.
6, 87 and 9. The + operator is not defined for arrays, and it concatenates strings, so it converts the arrays to strings.
Answer
Correct Answer:
6, 87 and 9. The + operator is not defined for arrays, and it concatenates strings, so it converts the arrays to strings.
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529.
What is the error in the statement: var charConvert = toCharCODE('X');?
toCharCode() is a non-existent method.
Nothing. The code will work fine.
toCharCode only accepts numbers.
toCharCode takes no arguments.
Answer
Correct Answer:
toCharCode() is a non-existent method.
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530.
Which of the following is the most secure and efficient way of declaring an array?
var a = []
var a = new Array()
var a = new Array(n)
var a
Answer
Correct Answer:
var a = new Array()
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531.
Which of the following is not a correct way to empty the array a?
a = new Array();
a = [];
a.splice(0,a.length);
a.clear()
Answer
Correct Answer:
a.splice(0,a.length);
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532.
Which of the following is the correct way to resize an iframe based on content?
Function resizeIframe(height)
{
Document.getElementById(‘frame_name_here’).height = parseInt (height) +60
}
<iframe id=’frame_name_here’ src=’ src.htm’></iframe>
Function resizeIframe(height)
{
Document.getElementByName(‘frame_name_here’).height = parseInt (height) +60
}
<iframe id=’frame_name_here’ src=’ src.htm’></iframe>
Function resizeIframe(height)
{
Document.getElementByDivId(‘frame_name_here’).height = parseInt (height) +60
}
<iframe id=’frame_name_here’ src=’ src.htm’></iframe>
None of these
Answer
Correct Answer:
Function resizeIframe(height)
{
Document.getElementById(‘frame_name_here’).height = parseInt (height) +60
}
<iframe id=’frame_name_here’ src=’ src.htm’></iframe>
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533.
Which of the following will detect if the browser supports a certain CSS property?
Typeof document.body.style.borderRadius == ‘string’
Typeof document.body.style.borderRadius == ‘undefined’
Typeof document.body.style.borderRadius == true
It is impossible.
Answer
Correct Answer:
Typeof document.body.style.borderRadius == ‘undefined’
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534.
Which of the following will detect which DOM element has the focus?
Document.activeElement
Document.ready
Document.referrer
Document.getelementbyid
Answer
Correct Answer:
Document.activeElement
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535.
Consider the following scenario:
Image thumbnails are displayed on a page. Upon clicking a thumbnail, the image is displayed in its actual size. The thumbnails aren't clickable, unless they are completely downloaded.
What event can be used to prevent the user from clicking on the thumbnails until they are completely downloaded?
OnLoad
OnKeyPress
OnKeyUp
onClick
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536.
How would you randomly choose an element from an array named myStuff if the number of elements changes dynamically?
randomElement = myStuff[Math.floor(Math.random() * myStuff.length)];
randomElement = myStuff[Math.ceil(Math.random() * myStuff.length)];
randomElement = myStuff[Math.random(myStuff.length)];
randomElement = Math.random(myStuff.length);
Answer
Correct Answer:
randomElement = myStuff[Math.floor(Math.random() * myStuff.length)];
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537. Which of the following is not a valid HTML event?
onunload
onchange
onupdate
onkeydown
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538. Consider the following code snippet:
function1
function2
both
none<br>
Answer
Correct Answer:
function2
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539. One way to add functions to an object is by ___.
adding functions to that object prototype.
declaring a new function with that object name as prefix.
There is no way to add functions to an existing object.
Answer
Correct Answer:
adding functions to that object prototype.
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540. You can map CSS properties to style properties by ___.
skipping dash characters and uppercasing the next letters of CSS properties.
removing all dash characters in CSS properties.
uppercasing all characters of CSS properties.
lowercasing all characters of CSS properties.<br>
Answer
Correct Answer:
skipping dash characters and uppercasing the next letters of CSS properties.
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541. Which of the following screen object properties returns the total width of the screen?
width
availWidth
availableWidth
There is no such property
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542. What is the result of c in the following code snippet?
string
number
undefined
This code snippet is invalid.
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543. Which of the following functions can be used to stop an event from propagating if you're using a W3C-compliant browser?
stopPropagation
endPropagation
finishPropagation
There are no such methods
Answer
Correct Answer:
stopPropagation
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544. Assume that the header has the following code snippet:
At the time this code snippet is executed, the element with id1 does not exist.
The function getElementById is not document's function.
It cannot alert a DOM element.
There is nothing wrong with the given code snippet.<br>
Answer
Correct Answer:
At the time this code snippet is executed, the element with id1 does not exist.
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545. What is the value of c in the following code snippet?
function a(){return a.caller;}
function b(){return a();}
null
undefined
Answer
Correct Answer:
function b(){return a();}
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546. Which of the following methods and properties can you use to change CSS class of an element?
className
cssClass
addClass
classCSS
Answer
Correct Answer:
className
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547. What is the result of the following code snippet?
An alert box pops up displaying "1"
An alert box pops up displaying"2"
An alert box pops up displaying "3"
An alert box pops up displaying "undefined"
Answer
Correct Answer:
An alert box pops up displaying "undefined"
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548. What does the following code snippet do?
It executes function1 and returns its value to onclick attribute of id1 tag.
It attaches function1 as click handler to id1 tag.
This code snippet is invalid.
Answer
Correct Answer:
It executes function1 and returns its value to onclick attribute of id1 tag.
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549. Consider the code snippet given below:
b == 0
b == 1
b == 2
b > 2
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550. What is the result of the following code snippet?
true
false
null
This code snippet is invalid
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551. window.frames is a collection of all of the ___ in the current page.
frames
iframes
frames and iframes
windows
Answer
Correct Answer:
frames and iframes
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552. What is the value of b in the following code snippet?
0
5
null
undefined
Answer
Correct Answer:
undefined
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553. Which of the following operators is(are) valid JavaScript operator(s)?
===
!==
=+
=»
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554. Which of the following functions can you use to test whether an object was created with a specific constructor or not?
instanceof
typeof
classof
classname
Answer
Correct Answer:
instanceof
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555. What is the result of the following code snippet?
This code snippet is invalid.
An alert box pops up showing "0".
An alert box pops up showing "1".
An alert box pops up showing "function()".
Answer
Correct Answer:
An alert box pops up showing "1".
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556. In javascript, functions can be declared without names
True
False
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557. screen.pixelDepth is not available in Internet Explorer 7.
True
False
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558. What is the result of the following code snippet?
An alert box pops up showing "undefined".
An alert box pops up showing "null".
An alert box pops up showing "function b".
This code snippet causes an error.
Answer
Correct Answer:
This code snippet causes an error.
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559. What is the result of the following code snippet?
An alert box pops up showing "JavaScript programming language".
An alert box pops up showing "programming language".
An alert box pops up showing "undefined programming language".
This code snippet is invalid.
Answer
Correct Answer:
An alert box pops up showing "JavaScript programming language".
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560. What is the value of c in the following code snippet?
undefined
null
1.8
This code snippet causes an error
Answer
Correct Answer:
This code snippet causes an error
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561. In the W3C model, which of the following methods can you use to prevent default behavior of an event?
preventDefault
stopDefault
cancelDefault
There is no such method
Answer
Correct Answer:
preventDefault
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562. What is the result of the following comparison?
true
false
undefined
This statement is invalid.
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563. Which of the following events can fire if a user doesn't use the mouse?
click
mouseout
mouseup
dbclick
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564. What is the resulting value of c in the following code snippet?
undefined
null
b
This code snippet is invalid.
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565. Which of the following is a good reason to avoid user agent sniffing?
User can change the user agent.
User agent is the same for all browsers.
Some browsers do not have user agent.
There is no reason to avoid user agent sniffing.
Answer
Correct Answer:
User can change the user agent.
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566. Which of the following statements can you use to reload a page?
location.reload();
location.href = location.href;
location.refresh();
Page cannot be reloaded.
Answer
Correct Answer:
location.reload();
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567. Which of the following functions can you use to test whether an element has any children or not?
hasChildNodes()
containChildNodes
hasAnyChildren()
There is no such function.
Answer
Correct Answer:
hasChildNodes()
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568. What is important difference between mouseenter and mouseleave event?
mouseleave only catches event bubble, mouseenter only catches event capture.
mouseleave only catches event capture, mouseenter only catches event bubble.
There are no difference between mouseenter and mouseleave.
Answer
Correct Answer:
mouseleave only catches event bubble, mouseenter only catches event capture.
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569. Which of the following regular expression methods can you use to check whether there exists a pattern within the given string or not?
check
match
test
There are no such methods.
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570. What is the result of the following statement?
true
false
This statement causes an error
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571. Which of the following comparison will return false in equal comparison (==)?
'' == '0'
0 == ''
false == 'false'
false == '0'
Answer
Correct Answer:
'' == '0'
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572. Consider the code snippet given below:
c.hasOwnProperty("a1");
c.hasOwnProperty("a2");
c.hasOwnProperty("prototype");
c.hasOwnProperty("a");
Answer
Correct Answer:
c.hasOwnProperty("a1");
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573. What is the result of the following code snippet?
alert dialog with Hello text
function
null
undefined
Answer
Correct Answer:
alert dialog with Hello text
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574. What is the value of document.referrer if a user opens the page from a bookmark?
undefined
empty string
The current address
The previous address
Answer
Correct Answer:
The current address
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575. What is the result of the following code snippet?
An alert box pops up showing "Outer function!".
An alert box pops up showing "Inner function!".
Two alert boxes pop up, the first one displaying "Outer function!", and the second one displaying "Inner function!"
This code snippet is invalid.
Answer
Correct Answer:
Two alert boxes pop up, the first one displaying "Outer function!", and the second one displaying "Inner function!"
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576. What is the result of type of(Infinity); statement?
undefined
Infinity
number
object
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577. Which of the following event object properties can you use to check whether that event is allowed to prevent default behavior or not?
cancelable
stoppable
preventable
There is no such property
Answer
Correct Answer:
cancelable
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578. Which of the following ways can you use to prevent default action when a user clicks on a link on any browser?
Use preventDefault method of event object on click event handler.
Set returnValue of event object to false on click event handler.
Return false value on click event handler.
There is no way to prevent default action.
Answer
Correct Answer:
Return false value on click event handler.
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579. What is the result of a in the following code snippet?
undefined
null
3
This code snippet is invalid
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580. In the W3C model, if you attach an anonymous function as an event handler of an element using addEventListener, how can you remove that anonymous function?
By adding a named function as event hander, then using removeEventListener to remove it.
By passing null argument to removeEventListener.
The anonymous function cannot be removed.
Answer
Correct Answer:
The anonymous function cannot be removed.
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581. What is the value of c in the following code snippet?
undefined
a
function
object
Answer
Correct Answer:
undefined
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582. In the web browser, global objects are properties of window object.
True
False
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583. Consider the code snippet given below:
a.prototype = new b();
a.prototype = b;
a.extend(b);
a.extend(new b());
Answer
Correct Answer:
a.prototype = new b();
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584. What is the result of c in the following code snippet?
undefined
null
string
object
Answer
Correct Answer:
undefined
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585. Which of the following ways can you use to attach click event handler to id1 div tag on all browsers?
<div onclick="function1();" id="id1">
var div1 = document.getElementById('id1');<br>div1.onclick = function1;
var div1 = document.getElementById('id1');<br>div1.addEventListener("click", function1, false);
var div1 = document.getElementById('id1');<br>div1.attachEvent("click", function1, false);
Answer
Correct Answer:
<div onclick="function1();" id="id1">
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586. Create the XMLHttpRequest is the same in all Internet Explorer browser versions.
True
False
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587. Which of the following method can you use to convert JSON data in responseText to JavaScript object?
eval
parseJSON
convertToObject
toJSON
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588. ___ property refers to the window that opens another window.
window.opener
window.parent
window.main
Answer
Correct Answer:
window.opener
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589. What is the result of the following code snippet
An alert box pops up displaying "string"
An alert box pops up displaying "number"
An alert box pops up displaying "null"
An alert box pops up displaying "undefined"
Answer
Correct Answer:
An alert box pops up displaying "undefined"
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590. Which of the following statements is true?
JavaScript does not support try/catch statements.
JavaScript supports try statement, but does not support catch statement.
JavaScript supports try/catch statement but not the finally statement.
JavaScript supports try/catch/finally statements.
Answer
Correct Answer:
JavaScript supports try statement, but does not support catch statement.
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591. Which of the following properties contains user agent string of web browser?
window.navigator.userAgent
document.Agent
window.User_Agent
window.clientType
Answer
Correct Answer:
window.navigator.userAgent
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592. Which of the following statement(s) define(s) a regular expression?
var a = /a-z/;
var a = new RegExp("a-z");
var a = new RegExp(/a-z/);
JavaScript does not support regular expression.
Answer
Correct Answer:
var a = new RegExp("a-z");
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593. What is the value of c in the following code snippet?
undefined
null
1.8
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594. What is the result of c in the following code snippet?
char
string
number
None of the above
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595. Which of the following is correct in order to send a HTML form post request using XMLHttpRequest?
set Content-Type header to application/x-www-form-urlencoded.
use postRequest method.
There are no way to post a request using XMLHttpRequest.
Answer
Correct Answer:
set Content-Type header to application/x-www-form-urlencoded.
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596. What does the following statement do?
It changes the title of the current window to "JavaScript" but does not change the text of the title tag.
It changes the text of «title» tag to "JavaScript".
It changes the global title variable value to "JavaScript".
This statement is invalid.
Answer
Correct Answer:
It changes the text of «title» tag to "JavaScript".
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597. Consider the following JavaScript alert:
<body onload="message()">
<body onunload="message()">
<body onsubmit="message()">
<body onreset="message()">
Answer
Correct Answer:
<body onload="message()">
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598. You've embedded the document.write() method to write some text within a pair of <TD></TD> table tags.
The browser does not support JavaScript
You are using an older version of the browser
The browser does not support cookies
Answer
Correct Answer:
The browser does not support JavaScript
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599. What is the difference between calling a JavaScript function directly like onclick = "a()" and onclick="JavaScript:a()" where a() is a function written in JavaScript?
There is no difference
The first technique is correct, only the second is incorrect
The second statement is more efficient than the first
The first statement looks for a function a() written in any language, whether it is JavaScript or vbscript, and the second technique looks for a function a() specifically written in JavaScript
None of the above
Answer
Correct Answer:
The first statement looks for a function a() written in any language, whether it is JavaScript or vbscript, and the second technique looks for a function a() specifically written in JavaScript
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600. You are allowing the user to upload image files. You want to be able to capture the attributes of the image such as width and height using JavaScript. How would this be possible?
It is not possible using JavaScript
You would use the Image object such as var img = new Image
You would use the Img object
This is possible only on the server side using a component
None of the above
Answer
Correct Answer:
You would use the Image object such as var img = new Image
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601. Which of the following are valid JavaScript methods?
scrollBy(dx, dy)
moveBy(dx, dy)
moveTo(x, y)
scrollTo(x, y)
All of the above are valid
Answer
Correct Answer:
All of the above are valid
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602. Are the following two statements the same?
Yes
No
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603. Which of the following could you do using JavaScript?
Form validation
Display a popup window
Change the color of the page
Display an alert
Prompt the user to enter a value
All of the Above
Answer
Correct Answer:
All of the Above
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604. Which of the following is not the part of JavaScript errors handling?
try
catch
throw
throws
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605. Which of the following statements are correct about the Prototype Pattern?this keyword.
All 1, 2, and 3
Only 1 and 2
Only 1 and 3
Only 2 and 3
Answer
Correct Answer:
Only 2 and 3
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606. Which of the following is not a JS window method?
modify()
resizeTo()
moveTo()
open()
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607. Timer value can be cleared using which of the following functions in JavaScript?
clearTimervalue()
clearTimeout()
clear()
flush(timer)
Answer
Correct Answer:
clearTimeout()
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608. What will be the result of the following code snippet?
True
False
Error on code
No output
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609. What will be the correct output of the following JavaScript code?
var x=1;if (x === 0)return 1;return x * f(x-1)+2;
40320
22360
57000
178882
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610. Determine the output of the given code snippet.
true<br>true<br>true<br>true
true<br>true<br>true<br>false
true<br>true<br>false<br>false
false<br>false<br>false<br>false
true<br>false<br>true<br>false
Answer
Correct Answer:
true<br>true<br>true<br>false
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611. What will be the output of the following code snippet?
False
True
0
1
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612. Which of the following is/ are invalid usage(s) for a web worker in JavaScript?
Only 1
Only 2
Both 1 and 2
None of the above.
Answer
Correct Answer:
Both 1 and 2
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613. What will be the output of the following code snippet?
22
2
4
0
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614. What will be the output of the following code snippet?
true
false
undefined
null
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615. Consider the given code snippet.
var a = [2, 5, 12, 16, 23, 35];return val > 20;
XXXX will be replaced by var b = a.find(abc)<br>YYYY will be replaced by val, index, array
XXXX will be replaced by var b = a.findIndex(abc) <br>YYYY will be replaced by index, array
XXXX will be replaced by var b = a.findIndex(abc) <br>YYYY will be replaced by val, index, array
XXXX will be replaced by var b = a.find(index) <br>YYYY will be replaced by val, index, array<br>Answer Choice 5<br>XXXX will be replaced by var b = a.findIndex(a);<br>YYYY will be replaced by val, index
Answer
Correct Answer:
XXXX will be replaced by var b = a.findIndex(abc) <br>YYYY will be replaced by val, index, array
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616. Using DATE object which of the following you to call a function based on elapsed time?
setElapsedTime()
timeout()
setTimeout()
setTime()
Answer
Correct Answer:
setTime()
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617. In relation to sealing an object globally, which of the following methods returns true if adding, removing, and changing properties is forbidden and all the current properties are configurable: false, writable: false?
Object.freeze(obj)
Object.isFrozen(obj)
Object.isSealed(obj)
Object.preventExtensions(obj)
Answer
Correct Answer:
Object.isFrozen(obj)
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618. In relation to object oriented JavaScript, which of the following options can be used as the value of F.prototype?
An object
Null
0
1
Answer
Correct Answer:
An object
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619. Which function of the Object constructor with regard to JavaScript 1.8 returns the array of names of only enumerable properties of the given object?
Object.keys()
Object.getOwnPropertyNames()
Object.getOwnPropertyDescriptor()
Object.getPrototypeOf()
Answer
Correct Answer:
Object.keys()
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620. Which of the following methods is used to add and/or remove elements from an array and modify them in place?
push
slice
join
splice
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621. Which of the following results is returned by the JavaScript operator "typeof" for the keyword "null"?
function
object
string
number
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622. Consider the following snippet code:
number
function
undefind
null
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623. Find the output of the following JavaScript code.
92
94
96
98
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624. What is the output of the following JavaScript code?
4
2+2
Error
None of the above
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625. What will be the output of the following JavaScript code?
Hi world<br>Apple<br>Juice<br>s are round, and apples are jui<br>Apple<br>Juice
Hi world<br>Apple \nJuice<br>s are round, and apples are jui<br>Apple<br>Juice
Hi world<br>Apple \nJuice<br>les<br>Apple<br>Juice
8<br>Apple \nJuice<br>les<br>Apple<br>Juice
Answer
Correct Answer:
Hi world<br>Apple \nJuice<br>s are round, and apples are jui<br>Apple<br>Juice
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626. In relation to object oriented JavaScript, which of the following options are the correct attributes of the object properties?
readable
writable
enumerable
configurable
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627. While working with JavaScript Page Redirection, which of the following options is an invalid method of the window.location object?
location.reload()
location.replace()
location.reassign()
window.navigate()
Answer
Correct Answer:
location.reassign()
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628. Which javascript method can be used to create or modify the attribute properties
defineProperty()
defineProperties()
Both defineProperty() and defineProperties()
None of the mentioned
Answer
Correct Answer:
Both defineProperty() and defineProperties()
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629. Which of the following is not a valid JavaScript operator?
*=
/=
%=
^+
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630. Name the different primitive data types of JavaScript ?
Boolean.Number.String.Null.Undefined.Symbol.
Boolean.Number.String.Undefined.Symbol.
String, Undefined, Number, Void Boolean,Function
String, Undefined, Integer, Void Boolean,Function
Answer
Correct Answer:
Boolean.Number.String.Null.Undefined.Symbol.
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631. Which of the following is the correct method for getting the date of February 1 of the current year into a variable called "newDate"?
var d = new Date();<br>newDate=new Date(d.getFullYear(), 1, 2);
var d = new Date();<br>newDate=new Date(d.getFullYear(), 2, 1);
var d = new Date();<br>newDate=new Date(d.getFullYear(), 1, 1);
var d = new Date();<br>newDate= (d.getFullYear(), 1, 1);
Answer
Correct Answer:
var d = new Date();<br>newDate=new Date(d.getFullYear(), 1, 1);
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632. What will be the correct output of the following JavaScript code?
8
9
10
11
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633. What will be the output of the following JavaScript code?
33
34
35
36
The code will generate an error.
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634. Find the correct output of the following JavaScript code.
19
21
23
25
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635. Which of the following modifiers must be set if we use the Javascript lastIndex Object Property during pattern matching?
i
m
g
s
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636. What will be the output of the following JavaScript code?
52
53
54
56
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637. Which of the following Javascript Regular Expression Character Classes finds any non-digit character in a given string?
\W
\S
\B
\D
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638. What we can use to restart the inner most loop in java script.
Using about.
Using brackloop
Using stop
Using continue lable
Answer
Correct Answer:
Using continue lable
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639. Which of the following methods can accept negative indexes?
substring()
slice()
Both options a and b.
Neither option a nor b.
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640. Which of the following is the correct syntax of DataView view of JavaScript?
new DataView( byteOffset, [byteLength])
new DataView(buffer, length [, byteOffset [, byteLength]])
new DataView(buffer [, byteOffset [, byteLength]])
new DataView(object, buffer [, byteOffset ])
Answer
Correct Answer:
new DataView(buffer [, byteOffset [, byteLength]])
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641. Which of the following method of Int8Array object is used for testing if all array elements pass the test given by a function or not?
Int8Array.prototype.entries()
Int8Array.prototype.every()
Int8Array.prototype.find()
Int8Array.prototype.map()
Answer
Correct Answer:
Int8Array.prototype.every()
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642. Which of the following JavaScript methods is used to return the primitive value of a Boolean object?
toSource()
toFixed()
ValueOf()
map()
Answer
Correct Answer:
ValueOf()
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643. What will be printed on the standard output console on the execution of the following JavaScript code?
First Value: 10 and Second Value: undefined
First Value: 10 and Second Value: 20
First Value: undefined and Second Value: undefined
The code will generate an error.
Answer
Correct Answer:
First Value: 10 and Second Value: undefined
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644. What is the purpose of the assign() method?
Only loading
Unloading of window
Displays already present window
Loading of window and display
Answer
Correct Answer:
Only loading
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645. Which of the following JavaScript objects is used to store unique values of any type?
Object
Set
String
Map
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646. While using JavaScript, which of the following options can be used to return a number between 0 and 50?
Math.floor(Math.random() & 50);
Math.floor(Math.random() * 51);
Math.floor(Math.random() * 51) + 1;
Math.floor(Math.random() @ 50)
Answer
Correct Answer:
Math.floor(Math.random() * 51);
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647. Which of the following properties of a JavaScript Array object is only present in the arrays that are created by regular expression matches?
length
prototype
index
input
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648. In relation to object oriented JavaScript [[Prototype]] property, which of the following statements is/are correct?
The prototype is only used for reading properties.
The write/delete operations cannot work directly with the object for data properties.
Both statements a and b are correct.
Neither statement a nor b is correct.
Answer
Correct Answer:
The prototype is only used for reading properties.
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649. What will be the correct output of the following JavaScript code?
success
failure
Code will execute but will not give any output.
Code will give a compilation error.
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650. In relation to JavaScript prototype, which of the following methods is used for returning an array of all own property names?
Object.getPrototypeOf(obj)
Object.getOwnPropertyNames(obj)
Object.keys(obj)
Reflect.ownKeys(obj)
Answer
Correct Answer:
Reflect.ownKeys(obj)
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651. Which of the following statements regarding let in JavaScript is not correct?
The let definition defines variables whose scope is constrained to the block in which they're defined. This syntax is very much like the syntax used for var.
The let expression lets you establish variables scoped only to a single expression.
The let keyword provides a way to associate values with variables within the scope of a block, and affects the values of like-named variables outside the block.
You can use let to establish variables that exist only within the context of a for loop.
Answer
Correct Answer:
The let keyword provides a way to associate values with variables within the scope of a block, and affects the values of like-named variables outside the block.
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652. What will the function NaN return for the condition NaN == NaN?
true
false
error
0
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653. Find the output of the following JavaScript code.
le, JavaSc
l, c
e, JavaSc
No output will be displayed.
The code will give an error.
Answer
Correct Answer:
e, JavaSc
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654. Which of the following methods is not a valid Array object method in JavaScript?
reverse
shift
unshift
splice
All of the above are valid
Answer
Correct Answer:
All of the above are valid
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655. What will be the output of the following JavaScript code?
2.5
15
35
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656. What will be the correct output of the following JavaScript code?
58
60
62
68
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657. What will be the output of the following code?
170
178
184
190
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658. Analyze the following code snippet. What will be the output of this code?
1
ain
7,29
7
ain,ain
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659. Is the following statement true or false?
True
False
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660. What will be the correct output of the following JavaScript code?
77
88
99
111
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661. Which of the following objects is the top-level object in the JavaScript hierarchy?
Navigator
Screen
Window
Document
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662. Which of the following DOM objects can be used to determine the resolution of the screen?
It is not possible to determine the resolution of the screen.
Screen object
Document object
Window object
None of the above
Answer
Correct Answer:
Screen object
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663. In relation to object oriented JavaScript, for which of the following options no wrapper objects are provided?
Null
Undefined
Both options a and b.
Answer
Correct Answer:
Both options a and b.
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664. What will be the output of the following code?
27,5
22,5
27,22
None of the above
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665. Which of the following options is the correct syntax of the Object.getOwnPropertyDescriptor method that is used for querying the full information about a property?
let d = Object.getOwnPropertyDescriptor(propertyName, obj);
let d = Object.getOwnPropertyDescriptor(obj, propertyName, descriptor);
let d = Object.getOwnPropertyDescriptor(obj, propertyName);
let d = Object.getOwnPropertyDescriptor(obj, descriptor);
Answer
Correct Answer:
let d = Object.getOwnPropertyDescriptor(obj, propertyName);
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666. Which of the following statements about JavaScript REFLECT object is NOT correct?
The Reflect.preventExtensions() method returns a string.
Reflect.get() method is used for returning the value of properties.
The Reflect object cannot be used with a new operator.
The Reflect.isExtensible() method provides the same functionality as that of Object.isExtensible() method.
Answer
Correct Answer:
The Reflect.preventExtensions() method returns a string.
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667. Which character combination is used to alter the order of operations by grouping expressions?
< >
[ ]
( )
{ }
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668. What is the result of the following code? (function () { 'use strict'; var x = "hello"; })(); x = 0; console.log(x);
Reference error
Scope error
Zero is written to the console
Answer
Correct Answer:
Zero is written to the console
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669. What is the following construct generally used for in JavaScript? (function () { // ... })();
To create a scope to protect code from the global scope
This has no effect
To force code to parse in a particular order
To enforce strict compilation of JavaScript
Answer
Correct Answer:
To create a scope to protect code from the global scope
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670. Are the parameters of a function checked?
No
Yes
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671. What kind of standard pattern is the following code? var x = function () { var y = 0; this.getCurrentCount = function () { return y; } }
Class Pattern
Module Pattern
Revealing Module Pattern
Answer
Correct Answer:
Class Pattern
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672. How would you iterate over the following object? var my_data = {a: 'Ape', b: 'Banana', c: 'Citronella'};
foreach (my_data as key => value) {}
None of these because you can only iterate over arrays, not objects
for (var i = 0; i < my_data.length; i++) {}
for (var key in my_data) {}
Answer
Correct Answer:
for (var key in my_data) {}
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673. What does the following code evaluate to? var arr = [1, 2, 3, 4]; arr.indexOf(2);
4
2
1
3
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674. Which of the following is a method of a RegExp object?
ignoreCase
eval()
exec()
makeMultiline()
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675. Assuming that each code is called with: "var say = sayHello("Mary Jane");", which of the following is a closure?
function sayHello(name) { var text = 'Hello ' + name; return text; }
function sayHello(name) { alert( 'Hello ' + name) }
function sayHello(name) { var text = 'Hello ' + name; var sayAlert = function() { alert(text); } return sayAlert; }
function sayHello(name) { console.log('Hello ' + name;) }
Answer
Correct Answer:
function sayHello(name) { var text = 'Hello ' + name; var sayAlert = function() { alert(text); } return sayAlert; }
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676. How do you construct a RegExp object?
var re = new RegExp('ab+c', 'i');
var re = RegExp('ab+c', 'i');
var re; re.RegExp('ab+c', 'i');
var re = new RegExp(/ab+c/i);
Answer
Correct Answer:
var re = new RegExp('ab+c', 'i');
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677. What kind of standard pattern is this code? var x = (function () { var y = 0; return { count: y }; })();
Class Pattern
Module Pattern
Revealing Module Pattern
Answer
Correct Answer:
Revealing Module Pattern
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678. What does the following code generate? var x = new Date();
x is equal to a zero date.
x is the current date and time.
x is equal to a minimum date.
Answer
Correct Answer:
x is the current date and time.
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679. What is the result of the following code? var my = { name: "Hello", count: 0 }; my.isValid = true; console.log(my.isValid);
true
Syntax error occurs
Runtime error occurs
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680. What happens when you throw an exception in the catch block, using nested try-catch blocks? For example: try { try { throw "Inside Exception"; } catch (ex) { throw "exception in inner finally"; } } catch (ex) { console.log("Outer Catch: " + ex) }
Runtime error
Syntax error
Exception isn't caught
Exception is caught by outer catch block
Answer
Correct Answer:
Exception is caught by outer catch block
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681. How do you access a property of an object?
objectName.propertyName();
objectName.getProperty('propertyName')
objectName.propertyName
objectName('propertyName')
Answer
Correct Answer:
objectName.propertyName
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682. What is the result of the following code? var someCode = "Math.ceil(5.5)"; var o = eval(someCode); console.log(o);
Math.ceil(5.5)
6
undefined
object
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683. Which of the following is a correct method for creating an empty array?
var myArray = array();
var myArray = [];
var myArray = ();
var myArray = new Array[];
Answer
Correct Answer:
var myArray = [];
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684. Which enforces strictness to a scope?
"strict";
'use strict';
'do strict';
use-strict;
Answer
Correct Answer:
'use strict';
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685. How do you specify code that will be executed whether an exception is thrown or not?
finally block
write code outside the try-catch block
all block
catch block
Answer
Correct Answer:
finally block
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686. What does the try statement do?
It attempts an HTTP request to the given URL.
It attempts to call a function.
It allows you test a block of code for errors.
It asynchronously attempt to call a function.
Answer
Correct Answer:
It allows you test a block of code for errors.
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687. Is this a valid multidimensional array? var myArray = [[1,2,3], "Hello", [6,7,8]];
No
Yes`
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688. Based on the following, what is the value of x? var obj = {}; obj["function"] = 123; x = obj.function;
native Function constructor
123
undefined. SyntaxError due to illegal position of a reserved word
undefined. Silent failure.
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689. What is the logical not operator in JavaScript?
|
~
-
!
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690. Which of the following is NOT a valid arithmetic operator?
^
+
-
*
/
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691. What is string concatenation?
The combination of two or more text strings
The splitting of a string into two or more strings
An elemental string
A complex string
Answer
Correct Answer:
The combination of two or more text strings
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692. Which keyword is used to begin a conditional statement?
condition
if
when
how
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693. Which character represents the assignment operator?
!
#
?
=
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694. Which character combination is used to create a single line comment?
$$
--
//
!!
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695. What is the "if" statement is used for?
It deals with logic that should execute only when a condition is false.
It creates a loop that runs as long as a condition is true.
It deals with logic that should execute only when a condition is true.
It converts an integer value to a boolean.
Answer
Correct Answer:
It deals with logic that should execute only when a condition is true.
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696. How do you create an empty array using literal notation?
var x = [];
var x = Array();
var x = [1, 2, 3];
var x = [Array()];
Answer
Correct Answer:
var x = [];
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697. Which is not a way to construct an array in JavaScript?
var x = new Array(1,2,3);
var x = [];
var x = array();
var x = [1,2,3];
Answer
Correct Answer:
var x = array();
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698. What does the following code write to the console? var x = false; if (x && console.log("hello")) { console.log("done"); }
'hello' and 'done' are both written
Only 'hello' is written
Nothing
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699. Which keyword is used to define the alternative path to take in a conditional statement?
alternative
next
or
else
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700. What is the outcome of the two alerts below? var foo = "Hello"; (function() { var bar = " World"; alert(foo + bar); })(); alert(foo + bar);
A message box "Hello World" and next a ReferenceError: "Can't find variable: bar"
A message box "Hello World" and next a message box "Hello"
A message box "Hello World"
Answer
Correct Answer:
A message box "Hello World" and next a ReferenceError: "Can't find variable: bar"
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701. JavaScript is a language that is
Weakly typed
Strongly typed
Answer
Correct Answer:
Weakly typed
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702. How do you get the current date in JS?
var date = Date();
var date = new Date().getDay();
var date = new Date();
Answer
Correct Answer:
var date = new Date();
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703. Math.floor(4.94291481249124); returns
2.47145740624562
3.14
5
4
TypeError: Object #<Object> has no method...
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704. What calls the debug function?
debug();
debugger.start();
debugger();
debug.activate();
debugger;
Answer
Correct Answer:
debugger;
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705. What will the code below output to the console? console.log( "A" - "B" + 2);
NaN2
null
NaN
undefined
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706. What return the html element of a document?
window.document
document.head
document.baseURI
document.body
document.documentElement
Answer
Correct Answer:
document.documentElement
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707. Which dialog box can be very useful when you want to pop-up a text box to get user input?
alert()
confirm()
prompt()
resp prompt()
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708. What are the results of the following equality operations? '' == '0' 0 == '' 0 == '0'
false, true, true
false, false, true
false, false, false
true, true, true
true, true, false
Answer
Correct Answer:
false, true, true
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709. What will .append() do in vanilla JavaScript?
Nothing, .append() is a jQuery function.
Throw an error, .append() is a jQuery function.
Add content to the selected element(s).
Answer
Correct Answer:
Throw an error, .append() is a jQuery function.
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710. Which of these is not a JavaScript object?
var x = [1, 2, 3];
var x = null;
var x = {name:"John", age:30};
var x = 1;
Answer
Correct Answer:
var x = 1;
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711. for the following code: var baz = 0; function foo() { alert(bar(baz)); var baz = 1; function bar(message) { return message + ' is ' + message + '!'; } baz = 2 alert(bar(baz)); } foo(); What gets alerted?
0 is 0! 2 is 2!
undefined is undefined! 2 is 2!
throws an error, bar is invoked before it is defined
1 is 1! 2 is 2!
0 is 0! 1 is 1!
Answer
Correct Answer:
undefined is undefined! 2 is 2!
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712. given the following code: var baz = 0; function foo() { alert(bar(baz)); var baz = 1; var bar = function(message) { return message + ' is ' + message + '!'; } baz = 2 alert(bar(baz)); } foo(); what is the output?
throws an error, bar is invoked before it is declared
undefined is undefined! 2 is 2!
0 is 0! 2 is 2!
throws an error, you can't assign a function to a variable in JavaScript
throws an error, bar is invoked before it is assigned a function
Answer
Correct Answer:
throws an error, bar is invoked before it is assigned a function
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713. How can you delete a variable in Javascript?
delete variable
variable = null
Answer
Correct Answer:
delete variable
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714. Which of these is the optimal method of executing a for-loop?
for (var i="lower limit"; i <= "upper limit"; i+"difference") { // code }
for (var i="upper limit"; i >= "lower limit"; i-"difference") { // code };
Answer
Correct Answer:
for (var i="upper limit"; i >= "lower limit"; i-"difference") { // code };
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715. what will be the VALUE and TYPE of i? var i = -Infinity;
NaN & Infinity
NULL & Undefined
NaN & NaN
Number & -Infinity
Answer
Correct Answer:
Number & -Infinity
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716. Which of the following return current millisecond count?
both
Date.now()
none
new Date().getTime()
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717. To define var1 = 'AAAAAAAAAAAAAAAAAAAA'; //20 times A Which of the following could be used
var var1 = 'A' * 20;
var var1 = Array(21).join("A");
var var1 = for (i=0; i<20; i++){ var1 += 'A';}
Answer
Correct Answer:
var var1 = Array(21).join("A");
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718. In the HTML code a div is present
. What will the following code alert ? var div = document.getElementById("test"); div.addEventListener("click",function(){ alert("The value of : "+ this.id); }.bind(this),false);;
The value is : undefined
The value is : test
Answer
Correct Answer:
The value is : undefined
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719. When iterating through an objects properties, which function should be used to check each property?
obj.propertyExists(p)
isProperty(p, obj)
hasProperty(object, p)
obj.hasOwnProperty(p)
Answer
Correct Answer:
obj.hasOwnProperty(p)
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720. Evaluate the result of c: var a = (NaN == NaN) ; var b = 0; var c = (a === b);
variable NaN undefined
false
type error ===
true
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721. Javascript is designed for the following purpose__________
To perform server side scripting operation
To add interactivity to HTML pages.
To style HTML pages
Answer
Correct Answer:
To add interactivity to HTML pages.
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722. In the expression y = "5" + 5;
'y' have a value of 10
'y' have a null value
'y' have a value of 55
'y' have an undefined value
Answer
Correct Answer:
'y' have a value of 55
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723. Suppose we have: var array = new Array(); var x = "Value"; How can you add a value to an array in Vanilla Javascript?
array.push(x);
array[x]
array[] = x;
Answer
Correct Answer:
array.push(x);
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724. What is the index of "horse" in the array below? [23, false, "cat", "horse", 0]
4
3
5
2
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725. What will the following statement evaluate to? 12 === "12"
12
NaN
true
false
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726. What does this line do? x = new Array(4,8);
Creates an array of two elements with values 4 and 8
Shows a syntax error
Creates a bi-dimensional array with value undefined for all elements
Creates a bi-dimensional array with value 0 for all elements
Answer
Correct Answer:
Creates an array of two elements with values 4 and 8
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727. What is the principle of debouncing?
It's creating a function that can be fired only once
It's limiting the changes of a variable
It's limiting the rate at which a function can be fired
Answer
Correct Answer:
It's limiting the rate at which a function can be fired
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728. var a = 11 + "11"; var b = a + 22; var c = a + b; c = ?
2222
55
111122
1111111122
Answer
Correct Answer:
1111111122
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729. How do you check if a variable todos is an Array?
typeOf todos
todos.isArray
typeof todos
Answer
Correct Answer:
todos.isArray
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730. What does document.createElement do?
Create New Attribute
Create New Div
Create New Tag
Create New Table
Create New Element
Answer
Correct Answer:
Create New Element
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731. What is the significance, and what are the benefits, of including 'use strict' at the beginning of a JavaScript source file?
Enforce the use of lowercase variable names.
Force the use of double quotes instead of single quotes.
Enforce stricter parsing and error handling on your JavaScript code at runtime.
Enable console debugging at runtime.
Answer
Correct Answer:
Enforce stricter parsing and error handling on your JavaScript code at runtime.
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732. What would the output be? var fruits = ["Banana", "Orange", "Apple", "Mango"]; fruits.shift();
Banana, Orange, Apple, Mango
Orange,Apple,Mango
Banana, Orange, Apple
Answer
Correct Answer:
Orange,Apple,Mango
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733. what is the return of this function? var a = 0, b = 1; function test(value) { return value; } test(a || b);
undefined
null
1
0
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734. What is logged? if ("10" + 1 == 101) { var a = "yes"; } console.log(a);
null
undefined
"yes"
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735. What is the value of foo? var foo = 10 + '20';
"1020"
11
undefined
30
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736. What methods, other than if-else/switch, can be used to execute conditional statements?
Do-While
Ternary Operators
Answer
Correct Answer:
Ternary Operators
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737. In the following example, what will be logged into the console? var animals = ['moose', 'giraffe', 'unicorn']; animals.forEach(function(animal, index) { if (index === 2) { console.log(animal); } });
giraffe
unicorn
null
undefined
moose
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738. Which is the correct syntax for declaring an object literal?
var person = ["firstName", "lastName", "age", "eyeColor"];
var person = [firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"];
var person = {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"};
var person = [firstName, lastName, age, eyeColor];
Answer
Correct Answer:
var person = {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"};
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739. What's the meaning of IIFE in Javascript ?
Immediately-Invoked Function Execution
Immediately-Invoked Function Expression
Answer
Correct Answer:
Immediately-Invoked Function Expression
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740. Which is NOT a JavaScript Type?
String
Boolean
Function
Number
Empty
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741. Choose from the following which is true about Javascript
All of these
None of these
Compiled
Interpreted
Answer
Correct Answer:
Interpreted
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742. What does Object.keys(x) return given the following x object. var x = { 'a': 1, 'b': 2 };
[ { 'a': 1}, { 'b', 2} ]
[ 1, 2 ]
[ a, b ]
[ 'a', 'b' ]
[ [ 'a', 'b' ], [ 1, 2 ] ]
Answer
Correct Answer:
[ 'a', 'b' ]
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743. What is the use of isNaN function
isNan function returns true if the argument is not a number otherwise it is array.
isNan function returns true if the argument is not a number otherwise it is boolean.
isNan function returns true if the argument is not a number otherwise it is false.
isNan function returns true if the argument is not a number otherwise it is string.
isNan function returns true if the argument is not a number otherwise it is true.
Answer
Correct Answer:
isNan function returns true if the argument is not a number otherwise it is false.
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744. Choose correct answer for the following statement: 'If you delete an object prototype property, it will..........'
.......do nothing
.......ensure that this object will not be instantiated further in the code
.......affect all objects inherited from the prototype
.......throw a JavascriptDeleteException
Answer
Correct Answer:
.......affect all objects inherited from the prototype
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745. function base(callback){ callback.call({msg:"hi"}) } function message(){ alert(this.msg) }; base(message); which is the value of alert?
undefined
null
""
hi
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746. What would be result of the following expression? console.log({} + {});
undefined
{}
''[object Object]"
NaN
"[object Object][object Object]"
Answer
Correct Answer:
"[object Object][object Object]"
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747. What does Date() for example return ?
99,5,24,11,33,30,0
86400000
"October 13, 2014 11:13:00"
Sun Oct 13 2014 11:13:00 GMT+0100 (CET)
Answer
Correct Answer:
Sun Oct 13 2014 11:13:00 GMT+0100 (CET)
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748. What the problem with the code ? function runner() { this.run = function() {} }; var runnerCollection = new Array(); for(var i = 0 ; i < 1000 ; i ++) { runnerCollection.push(new runner()); }
function run is duplicated in memory
push method is not corectly called
Answer
Correct Answer:
function run is duplicated in memory
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749. What will the code below output to the console and why? (function(){ var a = b = 3; })(); console.log("a defined? " + (typeof a !== 'undefined')); console.log("b defined? " + (typeof b !== 'undefined'));
a undefined? true b undefined? false
a undefined? false b undefined? true
a defined? false b defined? true
Answer
Correct Answer:
a defined? false b defined? true
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750. Which one of these is a valid syntax for a self-invokink fucntion?
function myFunction() { // code... } myFunction();
(function(window,document,undefined) { // code... })(this,this.document);
var myFunction = function() { // code... };
function myFunction() { // code... myFunction(); }
Answer
Correct Answer:
(function(window,document,undefined) { // code... })(this,this.document);
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751. What is newRay equal to at the end of the following code? var ray = []; ray["0"] = 1; ray["x"] = 2; var newRay = [] for( var i in ray ) { newRay.push( ray[ i ] ); }
[ 1, 2 ]
[ ]
[ 1 ]
[ 0 ]
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752. What will the following code return? function myFunction(param) { return arguments[1] || param; } myFunction(123, false, "test")
false
"test"
undefined
true
123
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753. If var a = 10, what will the result be of b with following syntax var b = a === 10 ? 'Sheldon' : 'Moonpie';
Moonpie
Howard
Sheldon
sheldon
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754. Output of the code: var a = 90100; function someFunc(){ if(false){ var a = 1; } else { var b = 2; } console.log(b); console.log(a); //(1) } someFunc();
undefined undefined
undefined 1
2 undefined
2 1
Answer
Correct Answer:
2 undefined
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755. What are the primitive data types in Javascript?
string, number, boolean, null, undefined
string, boolean, null, undefined, object
string, integer, float, boolean, null, undefined
string, integer, boolean, null
Answer
Correct Answer:
string, number, boolean, null, undefined
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756. How can you add a property to an Object that is not enumerable in a for...in loop?
Object.defineProperty
It is not possible. All keys get enumerated in a for...in loop
Object["propertyKey"] = propertyValue
Object.addProperty
Answer
Correct Answer:
Object.defineProperty
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757. What is the original or first name of javascript?
LiveScript
WebScript
EndSript
WebScript
Answer
Correct Answer:
LiveScript
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758. var self=this; self.color="red"; self.getColor=function(){ return this.color; } self.getColor.call({color:"white"})); What is the return value?
white
red
""
undefined
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759. How it will be evaluated ? null == undefined
True
ReferenceError: undefined is not defined
ReferenceError: null is not defined
False
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760. The term "javascript closure" refers to:
The scope chain that defines the variables that an inner function has access to
The local scope of an anonymous function
The local scope of a function plus the global scope and nothing else.
The properties added to an object prototype
Answer
Correct Answer:
The scope chain that defines the variables that an inner function has access to
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761. console.log([] == true)
False
True
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762. Javascript is an________ language
compiled
interpreted
Answer
Correct Answer:
interpreted
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763. Which one is NOT the attribute of the property of object?
writable
removable
enumerable
configurable
Answer
Correct Answer:
removable
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764. What is a potential pitfall with using typeof bar === "object" to determine if bar is an object?
If object is not set an error will occur.
null is also considered an object.
All variables in JavaScript are objects.
Answer
Correct Answer:
null is also considered an object.
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765. Which of the following statements about hoisted declarations in Javascript is true? If a value is assigned to a variable during the declaration (example: var x = 10;) then ...
the declaration and the initialization will never be moved to the top of the current scope.
the declaration and initializaltion are moved together to the top of the current scope.
the declaration with the initialization have to be put at the top of the current scope or we get a syntax error.
the declaration will be moved to the top of the current scope, but the value assignment will be not.
Answer
Correct Answer:
the declaration will be moved to the top of the current scope, but the value assignment will be not.
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766. What is the type of n? var n = 1121212.233333333; typeof n;
number
float
long
double
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767. var myObject = { foo: "bar", func: function() { var self = this; console.log("outer func: this.foo = " + this.foo); console.log("outer func: self.foo = " + self.foo); (function() { console.log("inner func: this.foo = " + this.foo); console.log("inner func: self.foo = " + self.foo); }()); } }; myObject.func();
outer func: this.foo = bar outer func: self.foo = bar inner func: this.foo = undefined inner func: self.foo = bar
outer func: this.foo = bar outer func: self.foo = undefined inner func: this.foo = undefined inner func: self.foo = bar
outer func: this.foo = bar outer func: self.foo = bar inner func: this.foo = null inner func: self.foo = bar
outer func: this.foo = bar outer func: self.foo = bar inner func: this.foo =
Answer
Correct Answer:
outer func: this.foo = bar outer func: self.foo = bar inner func: this.foo = undefined inner func: self.foo = bar
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768. What would be printed to the console? function foo(arg) { console.log(Math.pow(this, arg)) } setTimeout(foo.bind(5, 2), 0); console.log('Done');
Error
10 'Done'
'Done' 25
NaN 'Done'
32 'Done'
Answer
Correct Answer:
'Done' 25
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769. What will the below operation give you? var a = 14 var b = 9 console.log(a & b)
10
8
23
5
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770. for the following code: function foo() { var funcs = []; for (var i = 0; i < 10; i++) { funcs.push(function () { alert('value of i is ' + i); }); } return funcs; } var funcs = foo(); funcs[0](); what will be alerted?
throws an error: you can't push functions into an array like that
value of i is 0
value of i is 10
value of i is 9
throws an error, i is no longer available when funcs[0] is called
Answer
Correct Answer:
value of i is 10
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771. Which of the following can have a different value depending on who invoked the function accessing it?
this
var
scope
window
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772. What will be the output when the following code is executed? console.log(false == '0', false === '0')
0 0
true true
true false
false false
Answer
Correct Answer:
true false
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773. function locald() { var d = 6; console.log("d inside function: " + d); } locald(); console.log("d outside function: " + d); What will be value of d in or out of the function;
6 and not defined
6
null
not defined
Answer
Correct Answer:
6 and not defined
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774. Between JavaScript and an ASP script, which is faster
ASP is faster
Javascript is faster
Answer
Correct Answer:
Javascript is faster
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775. What return this function : function myFunction(p1, p2) { return p1 * p2; }
Nan
The function returns p2
The function returns the product of p1 and p2
Undefined
The function returns p1
Answer
Correct Answer:
The function returns the product of p1 and p2
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776. JavaScript Code can be called by using
Triggering Event
RMI
Preprocessor
Function/Method
Answer
Correct Answer:
Function/Method
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777. var total = 0; var it = { "1":2, "3":1, "4":3 }; for (i in it) total += it[i]; What is 'total' value?
14
6
8
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778. In JavaScript, functions are considered to be just another value. Why ?
Considered to be third-class objects
Considered to be second-class objects
Considered to be fourth-class objects
Considered to be first-class objects
Answer
Correct Answer:
Considered to be first-class objects
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779. Why does JavaScript subset disallow == and !=?
It uses === and !== instead
It uses equals() and notequals() instead
It uses bitwise checking
None of the mentioned
Answer
Correct Answer:
It uses === and !== instead
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780. var a = {a:1}; var b = {b:1}; var c = a; console.log(c==a);
true
false
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781. The catch statement ...
lets you handle the error
is like else
is like else if
lets you create custom errors
lets you to use another statement
Answer
Correct Answer:
lets you handle the error
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782. What is result of 1+1+typeof(typeof(null))?
2string
string
1string
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783. What is the use of void(0) ?
It is used to call another method without refreshing the page
Call function with no arguments
Specifies the return type
Answer
Correct Answer:
It is used to call another method without refreshing the page
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784. On https://www.google.com/?gws_rd=ssl#q=test. What does "window.location.hash" return
"#q=test"
"q=test"
"/"
"test"
Answer
Correct Answer:
"#q=test"
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785. var s = ~function(d) { return d+s; }(10); What is 's' value?
-1
undefined
10
null
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786. How many types of arguments are passed to an error handler:
three
one
four
two
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787. How can you get the square root of 2 in JavaScript?
Math.SQRT2
None of the Above
Math.Sqrt(2)
All of the above
Answer
Correct Answer:
Math.SQRT2
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788. Which of the following JavaScript operators would be most helpful in writing code to force a choice between seven options:
% as in x %7
/ as in x / 7
+ as in x + 7
++ as in x++7
Answer
Correct Answer:
% as in x %7
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789. Consider the following statements var count = 0; while (count < 10) { console.log(count); count++; } In the above code snippet, what happens?
The values of count is logged or stored in a particular location or storage.
The value of count from 0 to 9 is displayed in the console.
An error is displayed
An exception is thrown
Answer
Correct Answer:
The value of count from 0 to 9 is displayed in the console.
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790. Which company developed JavaScript?
Google
Netscape
Microsoft
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791. The keyword or the property that you use to refer to an object through which they were invoked is
this
from
object
to
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792. In HTML, JavaScript code must be inserted between <script> and </script> t
False
True
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793. What does return do?
Set input parameter
Returns some values of given function
Return true/false
Break the function operation
Answer
Correct Answer:
Returns some values of given function
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794. How can I get sum to be the sum of this array, var arr = [0,1,2,3]?
var sum = arr.sum()
var sum = arr.reduce(function(a,b){ return a + b });
var sum = Math.sum(arr)
var sum = arr.walk(function(a,b){ return a + b});
var sum = 0 + 1 + '2' + 3;
Answer
Correct Answer:
var sum = arr.reduce(function(a,b){ return a + b });
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795. The “var” and “function” are
Datatypes
Declaration statements
Keywords
Prototypes
Answer
Correct Answer:
Declaration statements
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796. JavaScript only hoists declarations, not initializations.
False
True
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797. var x = 3 && 4; What is x?
NaN
4
3
undefined
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798. If we don’t want the script to write page content, under which HTML tag should the JS tag be placed?
Both b and c above
< body>
< head>
Any of a and b above
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799. What will the following JavaScript output to console? var x = 8 + 8 + "8" + 8 + 8; console.log(x);
40
16888
88888
16816
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800. The enumeration order becomes implementation dependent and non-interoperable if :
The delete keyword is never used
If the object inherits enumerable properties
The object does not have the properties present in the integer array indices
Object.defineProperty() is not used
Answer
Correct Answer:
If the object inherits enumerable properties
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801. What is the output of: console.log("papa".replace("p", "m"));
papa
mapa
mama
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802. what is the type of i? var i = NaN;
NaN
number
null
undefined
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803. What will the code below output? Explain your answer. console.log(0.1 + 0.2); console.log(0.1 + 0.2 == 0.3);
true false
0.30000000000000004 false
false 0.30000000000000004
true true
Answer
Correct Answer:
0.30000000000000004 false
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804. What value is assigned to x: var x = (1, 2, 3);
2
3
undefined
1
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805. What values are assigned to x and y: var x = (0.1 + 0.2) == 0.3; var y = (0.1 + 0.1) == 0.2;
x == false y == false
x == false y == true
x == true y == true
x == true y == false
Answer
Correct Answer:
x == false y == true
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806. What is output to the console: (function() { var a = b = 1; })(); console.log (typeof b);
null
number
undefined
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807. The following one line function will return true if str is a palindrome; otherwise, it returns false. function isPalindrome(str) { str = str.replace(/\W/g, '').toLowerCase(); return (str == str.split('').reverse().join('')); }
false
true
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808. You want a dictionary-like data object such that you can give it the word to look up and it gives you the definition. Which of the following would create such an object and log a look-up to the console?
var dictionary = array("cat" => "domestic pet known for attitude", "dog" => "domestic pet known for loyalty", "fish" => "aquatic animal sometimes made a domestic pet"); console.log( diction
var dictionary = {"cat" : "domestic pet known for attitude", "dog" : "domestic pet known for loyalty", "fish" : "aquatic animal sometimes made a domestic pet"}; console.log( dictionary.dog );
var dictionary = new Array("cat" : "domestic pet known for attitude", "dog" : "domestic pet known for loyalty", "fish" : "aquatic animal sometimes made a domestic pet"); console.log( dictionary["
var dictionary = ["cat" : "domestic pet known for attitude", "dog" : "domestic pet known for loyalty", "fish" : "aquatic animal sometimes made a domestic pet"]; console.log( dictionary["dog"
Answer
Correct Answer:
var dictionary = {"cat" : "domestic pet known for attitude", "dog" : "domestic pet known for loyalty", "fish" : "aquatic animal sometimes made a domestic pet"}; console.log( dictionary.dog );
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809. What will be the output when the following code executed console.log(flase === '0')
true
false
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810. When automatic conversion of primitive values to objects (autoboxing) works in Javascript?
When you are trying to access a "property" of a primitive value
All of these are correct
When you pass a primitive value as the 'this' value to .call in non-strict mode
When you pass a primitive value as the 'this' value to .apply in non-strict mode
Answer
Correct Answer:
All of these are correct
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811. Which one is a construct function ?
function Person(firstname,lastname){ $this.firstname = firstname;$this.lastname = lastname; }
var Person = function(firstname,lastname){ this.firstname = firstname; this.lastname = lastname; }
Answer
Correct Answer:
var Person = function(firstname,lastname){ this.firstname = firstname; this.lastname = lastname; }
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812. var a = ['a','b','c']; console.log(a[2]);
a
c
b
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813. The difference between == and ===
Both are the same.
equality and type equality.
The first one checks for value equality and the second checks for value
Answer
Correct Answer:
equality and type equality.
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814. What does the following function return when called? functionmyFunction() { varnum = 2; return innerFunction(num); varinnerFunction = function(x) { return x*3; } }
Error
5
error
undefined
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815. How many datatypes are there in javascript according to ECMAScript 6 specifications?
7
5
error
8
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816. functionmyFunction() { varnum = 2; return innerFunction(num); function innerFunction(x) { return x*3; } }
6
Undefined
error
8
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817. Which of the following is not a datatype in javascript according to ECMAScript 6?
Character
Undefined
Number
Symbol
Answer
Correct Answer:
Character
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818. True or false? 'hello'.charAt(-1) === 'hello'[-1]
false
error occurs
true
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819. What is Math.max(5, [1, 4]);?
NaN
5
4
AVPlayer
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820. If Math.max(3, []); = 3, What is Math.max(3, {}); ?
NaN
3
AVPlayer
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821. Consider the following code: var bar = (function(){ function Bar(){}; return new Bar(); })(); How will you make another instance of Bar?
new bar()
new bar
Object.create(bar)
new bar.constructor()
Answer
Correct Answer:
new bar.constructor()
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822. What will the log display after executing the following? var book = { page1: "Once upon a time...", page2: "And thus they traveled north...", page3: "The rock golem hoisted...", printPages: function() { return book.page1 + book.page2 + book.page3; } } for (page in book) { console.log(page); }
page1 page2 page3
Once upon a time... And thus they traveled north... The rock golem hoisted...
page1 page2 page3 printPages
Once upon a time... And thus they traveled north... The rock golem hoisted... function () { return book.page1 + book.page2 + book.page3; }
Answer
Correct Answer:
page1 page2 page3 printPages
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823. Unlike C and C++, Javascript executes all statements ________________________.
On a line by line basis, so an operator is necessary to continue a statement on the next line.
From left to right, so the expression var x = 6 + 14 + " is my favorite number"; would say your favorite number was 20.
From right to left, so the expression var x = 6 + 14 + " is my favorite number"; would say your favorite number was 614.
Irrespective of white space, so a semi-colon is necessary at the end of each statement.
Trick question... Javascript is EXACTLY like C and C++
Answer
Correct Answer:
From left to right, so the expression var x = 6 + 14 + " is my favorite number"; would say your favorite number was 20.
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824. JavaScript is a[n] ______-scoped programming language.
file
function
expression
block
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825. What will be the Function length in this case: function zeroFunc(name, value)
2
0
1
4
3
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826. What is the value of myArray at the end of the following lines : var myArray = ["a", "b"]; myArray.concat(["b", "c"])
["a", "b", ["b", "c"]]
["a", "b", "b", "c"]
["a", "b", "c"]
["a", "b"]
Answer
Correct Answer:
["a", "b"]
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827. What does the nodeValue property return for an HTML element node?
null
The tag name of that element.
A number corresponding to the node type.
The innerHTML of that element.
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828. When using JavaScript to access the DOM, what will document.querySelector('*') return?
All HTML node elements with defined id or class selectors
The first HTML element node found.
null
All HTML element nodes.
All attribute nodes.
Answer
Correct Answer:
The first HTML element node found.
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829. Consider the function f: var f = function(a,b,c) { console.log(a,b,c); } Out of the options below, what is the right way of calling the function in order for the console to output nothing else than "1 2 3"?
f.apply(f, [1,2,3])
f.apply(f,1,2,3);
f.call(f, [1,2,3])
f("1 2 3");
f.call(1,2,3);
Answer
Correct Answer:
f.apply(f, [1,2,3])
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830. Be it a = 500 a >> 5 is the same as
a / 11111
a / 0x5
a * Math.pow(2,5)
a / Math.pow(2,5)
a >>> 5
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831. What will be printed in console? !function(){ console.log('!') }();
true
!
SyntaxError
false
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832. Be it a = 101 and p = 3 The operation a << p yields the same result as:
a * 2 * 2 * 2
Math.floor(Math.floor(Math.floor(a/2)/2)/2)
a * 9
a - 3
Answer
Correct Answer:
a * 2 * 2 * 2
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833. var x = ~1001 + "123" << 2; What is the value of x?
-4008492
-4008482
-1002
"-4008492"
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834. What is the last value of the variable named "i" ? var i = 5; for(i = 0; i < 11; i += 2){ i += 3; }
5
11
10
15
13
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835. Be it variable "s", holding a number. The operation 1 + (~s) yields the same result as:
-s
Math.ceil(s)
s++
Math.round(s)
Math.abs(s)
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836. What is the value of x? var x = ~1001;
-1002
-1001
false
true
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837. Consider the following variable assignments: var a = 1; var b = 2; For the values set above the operation (a & b) returns the same result as:
a - b
((a%2)&&(b%2))&&((Math.floor(a/2)%2) && (Math.floor(a/2)%2))
a + b
(a + b) % 2
a % b
Answer
Correct Answer:
((a%2)&&(b%2))&&((Math.floor(a/2)%2) && (Math.floor(a/2)%2))
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838. Consider the following variable assignment: var s = Math.random(9,100); the variable s is:
Any integer in the [10, 99] interval
Any real number in the [0,1) interval
NaN because the Math.random function doesn't take two input variables
Any integer in the [9, 100] interval
undefined
Answer
Correct Answer:
Any real number in the [0,1) interval
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839. Consider the following variable assignments: var a = 144; var p = 3; The operation a >> p yields the same result as:
Math.pow(a,p)
Math.pos(a, 1/p)
Math.floor(Math.floor(Math.floor(a / 2) / 2) / 2)
a * 2 * 2 * 2
0
Answer
Correct Answer:
Math.floor(Math.floor(Math.floor(a / 2) / 2) / 2)
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840. What will be printed in console? var i = function(){ return 10; }(); console.log(i());
'function()...'
Throw error
undefined
10
Answer
Correct Answer:
Throw error
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841. Which of the following Array prototype method actually modifies the array it's been called on?
slice()
concat()
splice()
all of them
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842. What will be printed to console? function Foo(){ var foo = 1; bar = 'hello' } var f = new Foo; console.log(f.foo,bar);
undefined "hello"
1 "hello"
undefined undefined
1 undefined
Answer
Correct Answer:
undefined "hello"
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843. What is the value of c? var a = function(){ this.b = 1; } var b = function(){ this.b = new a().b; return 5; } var c = b() + new b();
5
6
1
[object]
Error thrown when running the code
Answer
Correct Answer:
Error thrown when running the code
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844. What does the following return? Math.max();
0
null
Infinity
-Infinity
Answer
Correct Answer:
-Infinity
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845. Consider the following variable assignments: var a = 1; var b = 2; var c = 3; var r = a & b & c; The value of r is:
2
6
123
0
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846. What is the value of mike after this code is run? function Person(name, age) { this.name = name; this.age = parseInt(age, 10); } var mike = Person('Mike', '25');
{ name: 'Mike', age: '25' }
null
This code won't run. It throws a SyntaxError.
{ name: 'Mike', age: 25 }
undefined
Answer
Correct Answer:
undefined
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847. String values have a "length" property. Why is this property not included in a for-in loop over a string object? var prop, str; str = 'example'; /* str.length === 7 */ for ( prop in str) {}
Because the "length" property isn't a real property (defined and set through get/set accessors). Properties with accessors are not included in for-in loops.
Because the "length" property is only in the String prototype, it is not an own property of string objects, and as such is not included in a for-in loop.
Because the "length" property has internal [[Enumerable]] set to false.
Answer
Correct Answer:
Because the "length" property has internal [[Enumerable]] set to false.
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848. What does Math.random() do?
Returns a random number more than 0 up to and including 1.
Returns a random number from and including 0 to less than 1.
Returns a random number more than 0 and less than 1.
Randomly selects a number 1-10.
Randomly put numbers in descending and ascending order
Answer
Correct Answer:
Returns a random number from and including 0 to less than 1.
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849. Which of these will create a copy of an array such that changes to the old array will not be reflected in the new array?
var newArray = oldArray;
var newArray = new Array(oldArray);
var newArray = [oldArray];
var newArray = oldArray.slice(0);
Answer
Correct Answer:
var newArray = oldArray.slice(0);
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850. What is the value of x? var a = "abc"; var x = a instanceof String;
true
false
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851. What will this code produce: +new Date()
Unix timestamp in milliseconds (UTC timezone)
A SyntaxError
The Unix epoch (1970-01-01 00:00:00)
Unix timestamp in milliseconds (Local timezone)
Answer
Correct Answer:
Unix timestamp in milliseconds (UTC timezone)
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852. What are the values of x and y after the invocation of `foo` in following? var x = "I am global x"; var y = "I am global y"; function foo() { var y = x = "Hello from foo"; } foo();
x = "I am global x"; y = "I am global y";
x = "Hello from foo"; y = "I am global y";
x = "Hello from foo"; y = "Hello from foo";
The function throws a SyntaxError
Answer
Correct Answer:
x = "Hello from foo"; y = "I am global y";
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853. What will the following code will output? var Apple = function() { var color = "green"; var apple = { picked:false, pick: function() { this.picked = true; console.log (color); color = "yellow"; }, change: function() { this.color = Math.random() > 0.5 ? "yellow":"red"; } }; return apple; } var a = Apple(); a.pick(); console.log (a.color);
"green" and then "undefined"
"undefined" and "orange"
"undefined" and "yellow" or "red"
"undefined" and "undefined"
"green" and "orange"
Answer
Correct Answer:
"green" and then "undefined"
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854. What will be the value of result? function foo(bar) { return bar ? bar == foo : foo(foo); } var result = foo();
true
Function will end up in infinite loop
Value will be null
Function won't work due to incorrect syntax
false
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855. What is the value of a after executing the following: var a = [1, 2, 3]; a.splice(1, 2, 3);
[ ]
[1, 2, 3]
[1, 2, 3, 1, 2, 3]
[1, 2, 3, 2, 3]
[1, 3]
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856. What will be the result of this expression: void 0
SyntaxError
TypeError
undefined
null
Answer
Correct Answer:
undefined
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857. var x = { foo: "A" }; x.constructor.prototype.foo = "B"; var y = {}; console.log(x.foo); console.log(y.foo); Which two values will be logged?
"A" "A"
"B" undefined
"A" "B"
"A" undefined
"B" "B"
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858. Math.min() < Math.max(); will return
null
false
true
undefined
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859. "bar".split().length returns:
3
2
1
throws an error
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860. function Question() { this.answered = false; } Question.prototype.rightAnswer = 5; console.log( new Question().rightAnswer, Question.rightAnswer ); What gets printed to the console?
undefined 5
5 undefined
5 5
undefined undefined
Answer
Correct Answer:
5 undefined
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861. What will the following code, when evaluated, do? var void = function () {};
Throw a SyntaxError
Create a local variable named "void" but stays undefined due to a SyntaxError.
Assign an anonymous function to variable named "void"
Answer
Correct Answer:
Throw a SyntaxError
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862. Consider: var x = ['a', 'b', 'c']; Which line of code will remove the first element of the array, resulting in x being equal to ['b', 'c']?
x.unshift(0);
x.pop();
x.splice(0);
x.splice(0, 1);
Answer
Correct Answer:
x.splice(0, 1);
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863. Evaluate: new Boolean(new Boolean(false)).valueOf()
Type Error
(Instance of object Boolean with valueOf false)
false
true
undefined
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864. var a = isNaN(null); is a true or false?
false
true
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865. What will we see in the console after the following code run: var a = 'Bolt'; function f() { if (!a) { var a = 'Nut'; } console.log(a); } f(); console.log(a);
'Bolt' then 'Nut'
'Nut' and 'Nut'
'Bolt' and 'Bolt'
'Nut' then 'Bolt'
Answer
Correct Answer:
'Nut' then 'Bolt'
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866. What will be printed to console? function sayHi(person) { "use strict"; message = "Hi, " + person; console.log(message); } person = "Jim"; sayHi(person);
Hi,
Hi, Jim
Hi, undefined
ReferenceError: message is not defined
Answer
Correct Answer:
ReferenceError: message is not defined
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867. Which two values are logged by the following code? var x = 5; (function () { console.log(x); var x = 10; console.log(x); }());
10 10
nothing. Throws ReferenceError: x is not defined
5 10
undefined 10
Answer
Correct Answer:
undefined 10
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868. How can you remove an element from an array and replace it with a new one ?
array.replace(...)
array.split(...)
array.switch(...)
array.overwrite(...)
array.splice(...)
Answer
Correct Answer:
array.splice(...)
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869. Assuming alert displays a string of its argument: var a = 10; function example(){ alert(a); var a = 5; } example(); What will be shown if the preceding code is executed?
10
null
5
undefined
Answer
Correct Answer:
undefined
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870. What will be printed to the console as a result of this code? var printName = function() { console.log('Matt'); printName = function() { console.log('James'); }; }; var copy = printName; printName(); copy();
Matt Matt
Matt James
James James
James Matt
Answer
Correct Answer:
Matt Matt
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871. Which of the following expressions evaluates to false?
new Boolean(0) == 0
new Boolean('true') == true
new Boolean('false') == false
new Boolean(1) == 1
Answer
Correct Answer:
new Boolean('false') == false
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872. What value is passed to function "foo" as first argument? foo( +"5" );
NaN
"5"
"05"
0
5
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873. What is the value of x? var z = [typeof z, typeof y][0]; var x = typeof typeof z;
"object"
"array"
"string"
"undefined"
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874. console.log(1 + +"2" + "2")
"122"
32
Error
122
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875. What is the value of x.length after running this code? x = ["foo"]; x.quux = "Hello"; x[1] = "bar";
Error on middle line: cannot add properties to Array
1
Error on last line: index out of bounds
3
2
Note: This Question is unanswered, help us to find answer for this one
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876. What will: typeof typeof(null) return?
string
null
error
Number
empty
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877. True or false ? typeof(null) == typeof(undefined)
ReferenceError: undefined is not defined
true
ReferenceError: null is not defined
false
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878. What will be in console after executing this code: console.log(1 + '1' - 1);
'111'
10
1
'1'
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879. what is the value of x? var y = "100"; var x = + y + 10;
"10010"
undefined
NaN
110
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880. var x = {}; var foo = function () { this.hello = "Hi"; return this; }; x.bar = foo; What is the value of the following code: x.bar().bar().hello;
"function () { this.hello = "Hi"; return this; }"
"Hi"
undefined
TypeError: Object -- has no method 'bar'
TypeError: Cannot call method 'bar' of undefined
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881. How does JavaScript interpret numeric constants outside of strict mode?
As octal if they are preceded by a zero, and as hexadecimal if they are preceded by a zero and "x"
As hexadecimal if they are preceded by a zero only
As octal if they are preceded by an underscore
None of these are correct
Answer
Correct Answer:
As octal if they are preceded by a zero, and as hexadecimal if they are preceded by a zero and "x"
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882. The expression (typeof NaN === "number") evaluates to:
true
Throws an Error
false
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883. (function() { 'use strict'; foo = "bar"; })();
It kills your browser
It enables the JavaScript strict mode and creates a variable named "foo" in the global object (window)
It doesn't do anything
It throws an error : foo is not defined
It creates a variable named "foo" in the global object (window)
Answer
Correct Answer:
It throws an error : foo is not defined
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884. An (inner) function enjoys access to the parameters and variables of all the functions it is nested in. This is called:
Lexical scoping
Prototypal inheritance
Answer
Correct Answer:
Lexical scoping
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885. What is the output? var one; var two = null; console.log(one == two, one === two);
true true
false false
false true
Error: one is not defined
true false
Answer
Correct Answer:
true false
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886. What is the difference between the two declaration methods below? var functionOne = function() { /* some code */ } function functionTwo() { /* some code */ }
functionOne is defined in-place (until that line, functionOne is undefined), whereas functionTwo is hoisted to the top of the scope and is available as a function throughout the scope.
functionOne is not a correct way to define functions
functionTwo is defined in-place (until that line, functionTwo is undefined), whereas functionOne is hosted to the top of the scope and is available as a function throughout the scope.
No difference, they are treated the same way by the javascript engine. Different syntax to do the same.
Answer
Correct Answer:
functionOne is defined in-place (until that line, functionOne is undefined), whereas functionTwo is hoisted to the top of the scope and is available as a function throughout the scope.
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887. Given the following code: var myVar = '5'; var myAddedVar = myVar + 10; What is the value of (myAddedVar.constructor === Number)?
true
NaN
Type Error
false
undefined
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888. When reserved words are used as keys in object literals they must be ______?
This is not possible in javascript
escaped
Prefixed with the @ operator
quoted
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889. Which of the following assigned values of x will cause (x == x) to return false?
All of the answers
0/0
Number("foo")
NaN
Answer
Correct Answer:
All of the answers
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890. true + true will return :
undefined
2
true
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891. Which operator has highest precedence?
+
^
-
*
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892. What is the result of: function foo() { output( "biz " + bar() ); } bar(); var bar = function() { return "baz"; }
baz biz
biz bar
TypeError: Undefined is not a function
biz baz
foo baz
Answer
Correct Answer:
TypeError: Undefined is not a function
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893. Infinity * null will return :
NaN
null
Infinity
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894. What would this code print out? if (new Boolean(false)) console.log("True"); else console.log("False");
True
False
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895. Read the following function : function custom_indexOf( array, value ){ for(var i = 0; i < array.length; i++){ if(array[i] == value) return i; } } The property "length" of array is calculated at every loop beginning (true or false)
True
False
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896. Consider the following variable assignments: var a = 1; var b = 2; var r = a | b; The value of r is:
12
2
3
0
1
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897. console.log(3%2&1); The console displays:
0
1
2
3
NaN
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898. A javascript variable prefixed with a $ is:
valid javascript syntax as any other character
invalid, a common bug introduced by developers coming from PHP or Perl
still valid, but deprecated since Javascript 1.6
only valid within certain javascript libraries
Answer
Correct Answer:
valid javascript syntax as any other character
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899. function b(x, y, a) { arguments[2] = 10; alert(a); } b(1, 2, 3); What is alerted?
2
3
10
1
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900. What is the right way to combine two arrays into a new array? var a = ["a", "b", "c"]; var b = ["d", "e", "f"];
var c = a.push() + b.push();
var c = a.join(b);
None of these
var c = a.concat(b);
Answer
Correct Answer:
var c = a.concat(b);
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901. What will happen in the console after executing this code? if ("foo") { console.log("foo" === false); console.log("foo" === true); }
false false
TypeError : Cannot convert to boolean
(nothing)
NaN NaN
false true
Answer
Correct Answer:
false false
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902. What is the difference between using call() and apply() to invoke a function with multiple arguments?
apply() is identical to call(), except apply() requires an array as the second parameter
apply() is exactly identical to call()
apply() is deprecated in favor of call()
apply() is identical to call(), except call() requires an array as the second parameter
Answer
Correct Answer:
apply() is identical to call(), except apply() requires an array as the second parameter
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903. Which Object method takes a `propertyName` parameter and returns `true` if the object contains an uninherited property with that key?
obj.exists('propertyName');
obj.hasOwnProperty('propertyName');
obj.contains('propertyName');
obj.doesPropertyExist('propertyName');
obj.hasProperty('propertyName');
Answer
Correct Answer:
obj.hasOwnProperty('propertyName');
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904. Which of these will invoke a function?
function.Apply(...)
function.Execute(...)
function.apply(...)
function.invoke(...)
function.exec(...)
Answer
Correct Answer:
function.apply(...)
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905. Which of the following statements is not a bitwise operator
^
>>
>>>
%
<<
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906. What this code prints to console? (function(a){ return function(b){ return function(c){ console.log(a + b, c); } } })(1)(2)(3)
9
1 2 3
6
Throw error
3 3
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907. Which of these is not a built-in object constructor?
Array
RegExp
Time
Date
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908. What will the expression a === b return after the following? var a = { "foo": "bar" }; var b = { "foo": "bar" };
undefined
An exception is thrown.
false
true
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909. What is the result? "" ? "a" : "b"
"a"
"b"
Error: "" is not a boolean
""
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910. You use the Math.tan( ) method to:
Return the tangent of an angle (in gradients)
Return the tangent of an angle (in radians)
Does not exist in JavaScript
Return the tangent of an angle (in degrees)
Answer
Correct Answer:
Return the tangent of an angle (in radians)
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911. What is the end value of myAddedVar with the following code: var myVar = '5'; var myAddedVar = myVar + 10;
NaN
'510'
510
15
Nothing, the code will result in an error.
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912. What is the value of x after the following code is executed? var x = 0; x = x++;
0
1
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913. Does NaN equal itself?
No, when trying to compare it against itself, an exception is thrown.
No, NaN does not equal itself (== comparison would return false).
Yes, just like 123 is equal to (==) 123, NaN is equal to NaN.
Answer
Correct Answer:
No, NaN does not equal itself (== comparison would return false).
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914. What does null, undefined, "string", 20, true and false have in common?
they are primitive values
they are functions
they are objects
they have the same instance properties
Answer
Correct Answer:
they are primitive values
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915. Which are the different ways to affect the "this" reference in a function?
Direct attribution, e.g. this = x;
the
Invoking a function with the
Answer
Correct Answer:
Invoking a function with the
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916. var a = new Boolean(false); What is (typeof a)?
'false'
'object'
'number'
'primitive'
'boolean'
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917. var data = [1, 2, 3, 4, 5, 6]; data.shift(); What does data look like?
[2, 3, 4, 5, 6]
[undefined, 1, 2, 3, 4, 5]
[undefined, 2, 3, 4, 5, 6]
[1, 2, 3, 4, 5]
[6, 1, 2, 3, 4, 5]
Answer
Correct Answer:
[2, 3, 4, 5, 6]
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918. What is the value of x? var x = typeof null;
null
"null"
"object"
undefined
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919. What is this? (function() { /* code */ })()
Immediately-invoked function expression
function variable
Mistype error
Anonymous function
Answer
Correct Answer:
Immediately-invoked function expression
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920. '&' Operator is _____
a bitwise operator
an assignment operator
a displacement bit operator
an operator used in conditionals
Answer
Correct Answer:
a bitwise operator
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921. What does this line do? variable++;
Increments the value of "variable" and returns the new value
Returns an error to the browser
Adds the value of "variable" to itself
Returns a value 1 greater than "variable" without changing its value
Increments the value of "variable" but returns the previous value
Answer
Correct Answer:
Increments the value of "variable" but returns the previous value
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922. What is the value of x? var x = 1/0;
throws an exception
1
Infinity
0
NaN
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923. What is the type of `null`, according to the `typeof` operator?
"null"
"object"
"undefined"
"array"
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924. What will be logged to console? function foo(a){ console.log(a); }( 1+'1' );
11
Nothing
2
undefined
Throw Error
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925. Every object is linked to a _________ object from which it can inherit properties.
prototype
argument
sibling
parent
Answer
Correct Answer:
prototype
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926. What is the result of the following expression? ({"foo": true}).foo;
false
undefined
true
4
SyntaxError
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927. What is the value of x after the following statement? var x = 1 == '1';
false
undefined
true
1
'1'
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928. What is the value of `x` after the following? var x = "hello"; (function() { x = "goodbye"; }());
"hello"
"goodbye"
undefined. A SyntaxError is thrown
Answer
Correct Answer:
"goodbye"
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929. Is there a value type for individual string characters?
No, there is only type "string" for characters.
Yes, accessing a character offset from a (non-empty) string will yield a value of type "char".
Answer
Correct Answer:
No, there is only type "string" for characters.
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930. The length property of an Array object is always:
equal to the highest index of that object
equal to the number of properties in that object
equal to the highest index of that object + 1
Answer
Correct Answer:
equal to the highest index of that object + 1
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931. The "this" keyword refers to ...
parent object that hosts the current function.
current execution context (could be any value).
function currently being executed.
Answer
Correct Answer:
current execution context (could be any value).
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932. Given the following code, what is the value of x? var x = ['foo', 'bar']; x.length = 1;
[
[]
[
[
[
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933. How can you get the number of characters in a string ?
"1234567".length
"1234567".length()
"1234567".getLength()
"1234567".Length
"1234567".Length()
Answer
Correct Answer:
"1234567".length
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934. What will invoking `foo` return? function foo() { var x = 10; x = 7; };
null
10
undefined
foo
7
Answer
Correct Answer:
undefined
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935. What are curly braces ("{" and "}") used for?
Setting attributes
Block declarations and object literals
Invoking a function
Parsing JSON
Defining a class
Answer
Correct Answer:
Block declarations and object literals
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936. What is the value of x? function foo(y) { var z = 10; z = 7; }; var x = foo("bar");
null
10
"bar"
7
undefined
Answer
Correct Answer:
undefined
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937. If a function doesn't explicitly use the "return" operator, what will the return value be when the function is invoked?
undefined
null
NaN
closure
false
Answer
Correct Answer:
undefined
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938. Which has the correct syntax of a ternary operation?
var x = y === true : "true" ? "false";
var x = ( y === true ) : "true" ? "false";
var x = y === true ? "true" : "false";
var x = ( y === true ) { "true" : "false" };
Answer
Correct Answer:
var x = y === true ? "true" : "false";
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939. How can you concatenate multiple strings?
'One' + 'Two' + 'Three'
'One'.concat('Two', 'Three')
Both of these
Answer
Correct Answer:
Both of these
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940. What does Math.sqrt(-1) return?
1
-1
i
1.0
NaN
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941. What is the value of x? var x = 2 + "2";
"4"
"22"
22
4
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942. The _______ operator returns a string that identifies the type of its operand.
typeof
Type
typename
getType
TypeOf
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943. What is the name of the String prototype that appends the given string to the base string and returns the new string?
None of these does that and/or such method doesn't exist in javascript!
"x".add("foo")
"x".match("foo")
"x".combine("foo")
"x".concat("foo")
Answer
Correct Answer:
"x".concat("foo")
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944. Which of the following is a way to add a new value to the end of an array?
arr[arr.length()] = value;
arr[value] = length;
arr[arr.length] = value;
arr.length = value;
Answer
Correct Answer:
arr[arr.length] = value;
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945. split() is a method of which constructors' prototype?
None of these
Number.prototype
String.prototype
Array.prototype
Answer
Correct Answer:
String.prototype
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946. Which of these is not a JavaScript statement?
throw
None, these are all valid statements.
continue
break
Answer
Correct Answer:
None, these are all valid statements.
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947. What is the RegExp object constructor used for?
Provides access to Windows registry express values
Regulates the expression of variables
Match text against regular expressions
Switches numerical notation to exponential
Registers experienced functions with the DOM
Answer
Correct Answer:
Match text against regular expressions
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948. How do you assign an anonymous function to a variable?
var anon = new Function () { };
var anon = function() { };
var anon = func() { };
var anon = func({});
Answer
Correct Answer:
var anon = function() { };
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949. JavaScript is an implementation of the ______ language standard.
HTML
ActionScript
ECMAScript
VBScript
Answer
Correct Answer:
ECMAScript
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950. Which is the correct syntax to write array literals in JavaScript?
var x = array("blank", "blank", "blank”);
var x = {"blank","blank","blank"};
var x = new Array(1:"blank",2:"blank",3:"blank")
var x = ["blank","blank","blank"];
Answer
Correct Answer:
var x = ["blank","blank","blank"];
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951. How do you declare a function?
function doSomething() {}
all of these
function:doSomething() {}
function=doSomething() {}
Answer
Correct Answer:
function doSomething() {}
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952. Which of the following operators can assign a value to a variable?
All of these
+=
%=
=
Answer
Correct Answer:
All of these
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953. The "exploit" property:
Represents a variable
Does not exist in JavaScript
Is obsolete
Is a very important property
Answer
Correct Answer:
Does not exist in JavaScript
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954. Which of the following is an Error object constructor?
RangeError
Error
EvalError
All of these
Answer
Correct Answer:
All of these
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955. Which of the following invokes a user-defined object constructor function?
myConstructor x = create myConstructor();
myConstructor x = new myConstructor();
var x = create myConstructor();
var x = new myConstructor();
Answer
Correct Answer:
var x = new myConstructor();
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956. When an array index goes out of bounds, what is returned?
the first or last value in the array
Moderate
An error to the browser
undefined
A default value, like 0
Answer
Correct Answer:
undefined
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957. null === undefined
false
true
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958. Which of the following orders can be performed with the Array prototype "sort()" callback?
ASCII ordering
Ascending alphabetical
Descending alphabetical
All of these
Answer
Correct Answer:
All of these
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959. What is the value of x? var x = '1'+2+3;
15
"123"
The statement generates an error.
6
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960. (function( ) { var x = foo( ); function foo( ){ return "foobar" }; return x; })( ); What does this function return?
"foobar"
foo( )
TypeError: undefined is not a function
undefined
ReferenceError: foo is not defined
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961. In JavaScript, to call a function directly, you use:
arguments_if_any ( function_expression )
function_expression ( arguments_if_any )
( arguments_if_any ) -> function_expression
function_expression { arguments_if_any }
function_expression -> ( arguments_if_any )
Answer
Correct Answer:
function_expression ( arguments_if_any )
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962. A for loop is written as such: "for (first property; second property; third property) {...}" What does the third property represent?
An action to take at the beginning of the loop cycle
An action to take at the end of the current loop cycle
A condition to check at the beginning of a loop cycle
Answer
Correct Answer:
An action to take at the end of the current loop cycle
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963. Which of these operators compares two variables by value AND type?
===
=
None of these
==
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964. What is the difference between == and === ?
The == operator converts both operands to the same type, whereas === returns false for different types.
The == is used in comparison, and === is used in value assignment.
The === is deprecated, and now they are exactly the same.
Answer
Correct Answer:
The == operator converts both operands to the same type, whereas === returns false for different types.
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965. What is JavaScript used for?
Manipulating Web Page Behaviors
Styling web pages
A website cannot be created without JavaScript
None of the above.
Content definition within web pages
Answer
Correct Answer:
Manipulating Web Page Behaviors
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966. USERNAME and userName
Represent the name of different variables
Represent the name of the same constant
Represent the name of the same variable
Represent the name of different constants
Answer
Correct Answer:
Represent the name of different variables
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967. The `else` statement is ___
used inside of an `if` statement. To specify the code that should execute if the `if` condition is no longer true.
used together with the `if` statement to specify the code that should execute when the `if` condition is false.
Does not exist, in JavaScript `or` and `then` are used to specify code to execute for the "false" case of the `if` statement.
Answer
Correct Answer:
used together with the `if` statement to specify the code that should execute when the `if` condition is false.
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968. What does isNaN() do?
Only returns true if the argument is not a number
Converts a non-numeric value to a number.
Throws an error if a conditional statement is false.
Answer
Correct Answer:
Only returns true if the argument is not a number
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969. Properties of a RegExp object include:
lastIndex
source
All of these
ignoreCase
Answer
Correct Answer:
All of these
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970. Properties of objects may be accessed using...
none of these
the dot notation in JavaScript.
the redirect notation in JavaScript.
Answer
Correct Answer:
the dot notation in JavaScript.
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971. Which of these descriptors applies to JavaScript?
Strongly typed, variables are declared with a type, and you can not assign another type to the variable.
Loosely typed, values of any type can be assigned to any variable.
Answer
Correct Answer:
Loosely typed, values of any type can be assigned to any variable.
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972. What operator is used for string concatenation?
+
&
All of these
.
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973. What is the value of the following expression: 8 % 3
5
2
24
Other/Error
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974. Which of these will throw a SyntaxError?
if (x = 1) { }
if (x ==== 1) { }
if (x === 1) { }
if (x == 1) { }
Answer
Correct Answer:
if (x ==== 1) { }
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975. Which of the following declares a variable with a value of string type?
string myVar = "This is a string";
var myVar = "This is a string";
var string myVar = "This is a string";
Answer
Correct Answer:
var myVar = "This is a string";
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976. Which symbol is not used in logical operations?
||
&&
%
!
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977. Which of the following is a JavaScript comment?
// comment
\\ comment
-- comment
# comment
Answer
Correct Answer:
// comment
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978. Which is the correct way to write a JavaScript array?
var names = array("Tim", "Kim", "Jim");
var names = {1: "Tim", 2:"Kim", 3:"Jim"};
var names = {0: "Tim", 1: "Kim", 2: "Jim"};
var names = ["Tim","Kim","Jim"];
Answer
Correct Answer:
var names = ["Tim","Kim","Jim"];
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979. Given the following code, what does myFunc() return? var foo = 'foo'; var bar = 'bar'; function myFunc() { return foo + bar; }
An error is thrown because of illegal out of scope access.
"foo + bar"
NaN
"foobar"
"undefinedundefined"
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980. How do you check what the type of a value in variable x is?
x.__type;
typeof(x);
Object.type(x);
gettype(x);
Answer
Correct Answer:
typeof(x);
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981. JavaScript supports dynamic typing, you can assign different types of values to the same variable.
true
false
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982. Which of the following is a valid function definition?
function myFunc(arg1, arg2):
func myFunc = (arg1 as string, arg2 as int) { }
function myFunc(arg1,arg2) { }
Answer
Correct Answer:
function myFunc(arg1,arg2) { }
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983. String literals are written using:
Just double quotes: "example"
Just single quotes: 'example'
Either double quotes or single quotes: "example" and 'example'
Answer
Correct Answer:
Either double quotes or single quotes: "example" and 'example'
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984. Are variable identifiers case-sensitive?
Yes
No
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985. Which of the following primitive values exist in JavaScript?
number
All of these
string
boolean
Answer
Correct Answer:
All of these
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986. The var statement is used to:
Declare a member of a class
Change a constant
Create a new local variable
Retrieve a variable descriptor
Answer
Correct Answer:
Create a new local variable
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987. what is the difference between x++ and ++x?
++x is depreciated and replaced with x++;
x++ will return the value of x and then increment, where as ++x will increment the variable first then return its value.
They both do the same thing, just different syntax
Answer
Correct Answer:
x++ will return the value of x and then increment, where as ++x will increment the variable first then return its value.
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988. What is the correct JavaScript syntax to insert a comment that can span multiple lines?
/ This comment has more than one line /
// This comment has more than one line //
/* This comment has more than one line */
// This comment has mor than one line *//
Answer
Correct Answer:
/* This comment has more than one line */
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989. What is the difference between a while loop and a do...while loop?
The code inside a while loop will always be executed at least once, even if the condition is false.
The code inside a do...while loop will always be executed at least once, even if the condition is false.
There is no difference between them.
Answer
Correct Answer:
The code inside a do...while loop will always be executed at least once, even if the condition is false.
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990. Which of the following asserts that the variables `A`, `B`, and `C` have unequal values?
A !== B
A !== B && B !== C && A !== C
A !== B & B !== C
A !== B || B !== C
Answer
Correct Answer:
A !== B && B !== C && A !== C
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991. How do you find the number with the highest value of x and y?
Math.ceil(x, y)
max(x, y)
top(x, y)
Math.max(x, y)
ceil(x, y)
Answer
Correct Answer:
Math.max(x, y)
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992. Which of these is not a logical operator?
&
&&
||
!
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993. When writing an object literal, what is used to separate the properties from each other?
an underscore "_"
a colon ":"
a full-stop "."
a semicolon ";"
a comma ","
Answer
Correct Answer:
a comma ","
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994. var x = "foo"; x = !!x; What is the value of x?
true
undefined
NaN
"!!foo"
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995. Math.random() returns..
a random number that can be any value
a random number between 0 and 100
a random number between 0 and 1
a random number between 0 and 1000
Answer
Correct Answer:
a random number between 0 and 1
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996. What is the result of the following statement: 0 == "";
true
null
false
Throws Error, invalid comparison
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997. How do you assign object properties?
obj["age"] = 25 OR obj.age = 25
obj.age = 25 OR obj(@"age") = 25
obj(age) = 25 OR obj.age = 25
Answer
Correct Answer:
obj["age"] = 25 OR obj.age = 25
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998. What is the result? 0 == ""
Error: type mismatch
true
false
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999. Math.PI returns the mathematical constant π. What standard JavaScript method would return "3.14"?
Math.PI.toString("D2")
Math.PI.toFixed(2)
Math.Round(Math.PI)
Math.PI.toPrecision(2)
Answer
Correct Answer:
Math.PI.toFixed(2)
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1000. JavaScript is ...
subjective
evil
object based
objective
Answer
Correct Answer:
object based
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JavaScript MCQs | Topic-wise
