Why can I use a function before it's defined in JavaScript?

Question

This code always works, even in different browsers:

function fooCheck() {
  alert(internalFoo()); // We are using internalFoo() here...

  return internalFoo         


        

Answer 1

I have only used JavaScript a little. I am not sure if this will help, but it looks very similar to what you are talking about and may give some insight:

http://www.dustindiaz.com/javascript-function-declaration-ambiguity/