Why are self-executing anonymous functions used in Javascript Module pattern?

Question

In the module pattern in JavaScript \"Immediately-Invoked Function Expressions\" (also known as self-executing anonymous functions) are used as self executing functions that

Answer 1

You can define a anonymous function via named function.

Example:

//factorial
(function(n){
    var self = function(n){
        //call self
        return n > 0 ? (self(n-1) * n) : 1;
    }
    return self;
})()