ModulePatternBasket.js

var basketModule = (function () {
  //Privates
  var basket = [];
  
  function doSomethingPrivate() {
    //
  }
  
  function doSomethingElsePrivate() {
    //...
  }
  
  //Return an object exposed to the public
  return {
    //Add items to our basket
    addItem: function( values ) {
      basket.push(values);
    },
    
    getItemCount: function () {
      return basket.length;
    },
    
    //Public alias to a private function
    doSomething: doSomethingPrivate,
    
    // get the total value of items in the basket
    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() );
console.log( basketModule.getTotal() );