JS: patterns Singleton

singleton.js

var mySingleton = (function () {

    // Instance stores a reference to the Singleton
    var instance;

    function init() {

        // Singleton

        // Private methods and variables
        function privateMethod(){
            console.log( "I am private" );
        }

        var privateVariable = "Im also private";

        return {

            // Public methods and variables
            publicMethod: function () {
                console.log( "The public can see me!" );
            },

            publicProperty: "I am also public"
        };
    }

    return {

    // Get the Singleton instance if one exists
    // or create one if it doesn't
    getInstance: function () {

        if ( !instance ) {
            instance = init();
        }

        return instance;
    }

    };

})();