Revealing Module Pattern

gistfile1.js

// Define an object using the Revealing Module Pattern
var myCounter = function() {

  // Both Private and Public methods and properties are defined here

  var counter = 0;

  function count() {
    return 0+counter;
  }

  function increment() {
    counter++;
  }

  function decrement() {
    counter--;
  }

  // Return references to those members which you wish to be public.
  return {
    'increment':increment,
    'decrement':decrement,
    'count':count
  };

}();

// Use the public interface.
myCounter.count(); // 0
myCounter.increment();
myCounter.count(); // 1