A simple counter object, which uses closures instead of "this".

counter-module.js

var Counter = (function counter(i) {

  increment = function increment() {
    ++i;
  };

  decrement = function decrement() {
    --i;
  };

  return {
    get count() {
      return i;
    },
    set count(newValue) {
      i = newValue;
    },
    increment: increment,
    decrement: decrement
  };
});

var myCounter = Counter();