IIFE + Augmentation

iife.js

/*
Sample IIFE + Augmentation
Here I created a module counter,
and augmented it (added reset function).
*/

var counter = (function() {
  var count = 0

  return {
    get: function() {
      return count
    },
    set: function(val) {
      count = val
    },
    increment: function(num) {
      count += num || 1
    }
  }
})()

console.log(counter.get())
counter.set(4)
console.log(counter.get())
counter.increment()
console.log(counter.get())
counter.increment(10)
console.log(counter.get())

var counter = (function(oldNS) {
  if (oldNS) {
    oldNS.reset = function() {
      oldNS.set(0)
    }
  }
  return oldNS
})(counter)

counter.reset()
console.log(counter.get())