chap1->The view-model->The model

1. Create separate model 'Product'
2. Place link to product.js in HTML at correct place
3. Learn & apply Revealing Module Pattern on both Product module and viewmodel

ko-cart/index.html

@@ -30,6 +30,7 @@
     <script type="text/javascript" src="js/bootstrap.js"></script>
     <script type="text/javascript" src="js/knockout-3.2.0.js"></script>
     <!-- app -->
+    <script type="text/javascript" src="js/models/product.js"></script>
     <script type="text/javascript" src="js/viewmodel.js"></script>
   </body>
 </html>

ko-cart/js/models/product.js

@@ -0,0 +1,13 @@
+var Product = function (id, name, price, stock) {
+  "use strict";
+  var _id = id,
+    _name = name,
+    _price = price,
+    _stock = stock;
+  return {
+    id: _id,
+    name: _name,
+    price: _price,
+    stock: _stock,
+  };
+};

ko-cart/js/viewmodel.js

@@ -1,9 +1,7 @@
-var vm = {
-    product: {
-        id: 1,
-        name: 'T-Shirt',
-        price: 10,
-        stock: 20
-    }
-};
+var vm = (function() {
+    product: Product(1, 'T-Shirt', 10, 20);
+    return {
+        product: product
+    };
+})();
 ko.applyBindings(vm);