gistfile1.js

var myInstance = (function() {
    var privateVar = '';
    function privateMethod () {
        alert(myInstance.public_var);
    }
    return { // public interface
        public_var : 'Here',
        publicMethod1: function () {
            // all private members are accessible here
            // access public methods and variables using the singleton name
            myInstance.public_var = 'There';
            myInstance.publicMethod2();
        },
        publicMethod2: function () {
            privateMethod();
        }
    };
}());