Counter

Counter.js

var counter = (function(){
 var i = 0,
 timer = {};
 timer.get = function(){
     return i;
 };
 timer.set = function(value){
     i = value;
 };
 timer.increment = function(){
     ++i;
 };
 timer.decrement = function(){
     i = (i === 1 ? 0 : (i-1));
 };
 return timer;
})();