pattern.js

var testModule = (function () {
    var myPrivateVar, myPrivateMethod;
    // A private variable
    myPrivateVar = 0;
    // A private function
    myPrivateMethod = function(foo) {
        console.log(foo);
    };
    return {
        // A public variable
        myPublicVar: "foo",
        // A public function
        myPublicFunction: function(bar) {
            // Increment our private counter
            myPrivateVar++;   
            // Call our private method using bar
            myPrivateMethod(bar);
        }
    };
})();
// Usages
testModule.myPublicFunction();