What does (foo) in function(args){ ... }(foo) mean?

Question

I've been struggling with Javascript objects.

What does (foo) in function(args){ ... }(foo) mean?

Answer 1

You are declaring a function then right after that you call it. you could do it in 2 steps :

function f(args){}

f(foo);

Single step and anonymous :

(function(args){})(foo);