What is the result of the following code snippet?

function a() {
  var x = [];
  var i = 0;
  a[i] = function(){
    return i;
  }
  i++;
  alert(a[0]());
}
a();

Which function can you use to test whether an object was created with a specific constructor or not?

Which operators is valid JavaScript operator(s)?

Value of b? var a = Array(5); var b = a[0];

window.frames is a collection of all of the ... in the current page.

What's the output? var a = {f: 'object'}; var b = {f: 'object'}; var c = a == b;

What's the output? function testGenerator() { yield 'first'; document.write('step1'); yield 'second'; document.write('step2'); yield 'third'; document.write('step3'); } var g = testGenerator(); document.write(g.next()); document.write(g.next());

How can the operating system of the client machine be detected?

How can a JavaScript object be printed?

Which is not a valid method in generator-iterator objects in JavaScript?

When setting cookies with JavaScript, what will happen to the cookies.txt data if the file exceeds the maximum size?