Javascript singleton

singleton.js

var Singleton = (function() {

    var random     = ( "My Private Random Int = " + parseInt(1000 * Math.random()) );
    var privateVar = "My Private Variable";

    function privateMethod () {
        return ( "My privateMethod()\n" + privateVar );
    }

    /**
     * Public interface
     */
    return {

        publicMethod1: function () {
            return ( "My publicMethod1()\n" + privateMethod() + "\n" + random );
        },

        publicMethod2: function () {
            return ( "My publicMethod2()\n" + this.publicMethod1() );
        }

    };

})();


alert( Singleton.publicMethod2() );