safaribook-knockout-essentials/ko-cart/js/viewmodel.js

"use strict";
var vm = (function() {
    
    var catalog = [
        Product(1, "T-Shirt", 10.00, 20),
        Product(2, "Trousers", 20.00, 10),
        Product(3, "Shirt", 15.00, 20),
        Product(4, "Shorts", 5.00, 10)
    ];

    return {
        catalog: catalog
    };
})();
ko.applyBindings(vm);