What is the result of the following code snippet?

function a() {alert(x);}
function b() {var x = "function b"; a();}
b();

screen.pixelDepth is not available in Internet Explorer 7.

In javascript, functions can be declared without names

What's the output? 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)?

Which will check whether the variable vRast exists or not?

Which one changes an image on the page?

Consider the following variable declarations: var a="adam" var b="eve" Which of the following would return the sentence "adam and eve"?

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?