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?

How can you remove an element from an array and replace it with a new one ?

Which two values are logged by the following code? var x = 5; (function () { console.log(x); var x = 10; console.log(x); }());

What's the output? function sayHi(person) { 'use strict'; message = 'Hi, ' + person; console.log(message); } person = 'Jim'; sayHi(person);

Object.keys(x)

What's visible in the console after running code: var a = 'Bolt' function f() { if (!a) { var a = 'Nut' } console.log(a); } f(); console.log(a);

What's the output? var xyz = true; if (xyz) { let res = 42; } console.log(res);

Which types of image maps can be used with JavaScript?

Which represents when a String object splits a String object into an array of strings by separating the string into substrings?

Evaluate the following expression: ~-(2 + '2')

Which Popup Boxes have support in JavaScript?