sortByNumber

Yo dudes,

I’ve got some trouble understanding this code to sort an Array by number:

 function sortByNumber(a, b) {
  return (a > b);
}
ages = [13, 52, 33, 2, 25, 14, 3, 77, 8];
ages.sort(sortByNumber);
trace(ages); 

Can someone make me understand it?