var module = (function (window, document, $) {
    // private variables and functions
    var _private = 'bar';

    // constructor
    var module = function () {
    	console.log('init module');
    };

    // prototype
    module.prototype = {
        constructor: module,
        something: function () {
            console.log(_private);
        }
    };

    // return module
    return module;
})(window, document, jQuery);


// Extensible:
var module = (function (module) {
    module.prototype.something_else = function () {
    	// content
    };
    return module;
})(module);


// USAGE:
var my_module = new module();
my_module.something();