design-patterns.js

// Module Pattern
// If not an IIFE, it's contents can be read as a string
var Exposer = (function () {
  // Everything here is private
  var private = 'contents';

  // Everything here is public
  return {
    public: function() {
      console.log(private);
    }
  }
}());

console.log(Exposer.private);
Exposer.public();


// Revealing Module Pattern
var Exposer = (function () {
  // Everything here is private
  var private = 'contents';

  var remainPrivate = function() {
    console.log('This will not be revealed');
  }

  var showThis = function() {
    console.log('This will be revealed');
  }
  var showThisToo = function() {
    console.log('This will be revealed as well');
  }

  // Everything here is public
  return {
    showThis: showThis,
    showThisToo: showThisToo
  }
}());

console.log(Exposer.remainPrivate); // Undefined
Exposer.showThis();       // 'This will be revealed'
Exposer.showThisToo();    // 'This will be revealed as well'