Anonymous functions

An interesting fact:

var sum = function(x,y,z) {
 return (x+y+z);
}(1,2,3);

is an anonymous function. That means sub is now 6. If you call sum with any arguments it will bark at you. Where as this:

var sum = function(x,y,z) {
 return (x+y+z);
};

is a named function. Sum is a function that accepts 3 arguments. If you call sub(2,3,5), it will return 10.