var Restaurant = (function () {

    var name,

        secretSkills = {

            pizza: function () { return new Pizza() },

            sushi: function () { return new Sushi() }

        }

​

    function Restaurant(_name) {

        name = _name

        this.getName = function () { alert(name); };

    }

    Restaurant.prototype.getFood = function (name) {

        return name in secretSkills ? secretSkills[name]() : null

    }

    return Restaurant

})();

​

​

var r1 = new Restaurant("r1");

var r2 = new Restaurant("r2");

r1.getName();

r2.getName();