Consider the given code snippet.

var a = [2, 5, 12, 16, 23, 35];

XXXX

function abc( YYYY ) {
    return val > 20;
}

Which of the following options will replace XXXX and YYYY in order to generate 4 as an output?

What's the output? var str = /u/.exec('I am the best friend!'); console.log(str);

What's the output? var test = function test(){ console.log('2' - - '2'); }; test();

Which are invalid usage(s) for a web worker in JavaScript? 1. Making use of the window shortcut to get the current global scope in a web worker. 2. Trying to access data in DOM directly with a web worker.

What's the output? var test = function test(){ console.log(window.location === document.location); }; test();

What's the output? var a = /xy/i, b = new RegExp(a, 'g'); console.log(a.test('xy')); console.log(b.test('xy')); console.log(a.test('XY')); console.log(b.test('XY'));

Best reason for not using 'for...in' with array iteration?

Which are not valid HTML events?

The following functions are for encoding URL parameters in Javascript. Which function escape converts non-ASCII characters into its Unicode escape sequences, like %uxxx?

Which can be used to write a JavaScript function that will accept user input?

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?