Module pattern

gistfile1.js

// http://speakerdeck.com/u/addyosmani/p/large-scale-javascript-application-architecture

var backetModule = (function(){
     var basket = []; // private
     return { // exposed to public
          addItem : function(values){
               basket.push(values);
          },
          getItemCount : function(){
               return basket.length;
          },
          getTotal : function(){
               var q = this.getItemCount, p = 0;
               while(q--){
                    p += basket[q].price;
               };
               return p;
          }
     };
}());

basketModule.addItem({ item : 'bread', price : 0.5 });
basketModule.addItem({ item : 'butter', price : 0.3 });

console.log(basketModule.getItemCount()); // 2
console.log(basketModule.getTotal()); // 0.8

console.log(basketModule.basket); // undefined
console.log(basket); // undefined