Singleton class for JS(ES5 style)

js_singleton_class.js

//namespace[begin]****************************
var mypackage;
if (mypackage === undefined) {
    mypackage = {};
}
//namespace[end]****************************


mypackage.MyClass =
    (function () {
        'use strict';

        /**
         * @constructor
         */
        function MyClass() {
            this._privateName = 0;

        }

        /**
         * Method
         * @returns {number}
         */
        MyClass.prototype.getName = function () {
            var me = this;
            return me._privateName;
        };

        //Normal Class
        //return MyClass;

        var _instance;

        //Singleton Class
        return {
            getInstance: function () {

                if (!_instance) {
                    _instance = new MyClass();
                }

                return _instance;
            }
        };


    })();