encapsulation in javascript module pattern

Question

I was reading this link http://addyosmani.com/largescalejavascript/#modpattern

And saw the following example.

var basketModule = (function() {
var b         


        

Answer 1

In the first variant you create an object without the possibility to create new instances of it (it is an immediately instantiated function). The second example is a full contructor function, allowing for several instances. The encapsulation is the same in both examples, the basket Array is 'private' in both.

Just for fun: best of both worlds could be:

var basketModule = (function() {
   function Basket(){
        var basket = []; //private
        this.addItem = function(values) {
            basket.push(values);
        }
        this.getItemCount = function() {
            return basket.length;
        }
        this.getTotal = function(){
            var q = this.getItemCount(),p=0;
            while(q--){
                p+= basket[q].price;
            }
        return p;
       }
     }
   return {
     basket: function(){return new Basket;}
   }
}());
//usage
var basket1 = basketModule.basket(), 
    basket2 = basketModule.basket(),