/** How to write a JavaScript module: */

var myModule = (function() {
        // exports contains "public" methods and properties:
    var exports = {},
        // priv contains private functions and data
        priv = {};

    // Optional init function. See 3rd last line.
    priv.init = function() {
        // here you might choose to set up some stuff, get data, etc.
    };

    // this is how you would make a private function. It's only visible inside the module.
    priv.doSomething = function() {
        priv.someValue = Math.random();
    };

    exports.whoAreYou = function() {
        return "I'm just a module. What's it to you?";
    };

    // OPTIONAL:  Creating a private "init" function is often useful.
    priv.init();
    return exports;
}());




/** How to interact with a module: */

// assume we have a module "myModule", as defined above.

console.log( myModule );        // look at your console to see the module's public stuff.

console.log( myModule.whoAreYou() );    // logs that stuff from above.

console.log( myModule.doSomething() );      // ERROR: doSomething is private!