Module Design Pattern in JS

modular.js

// Module using the Module Design Pattern
var Module = (function() {
  // Private variable
  var privateVariable = "I am a private variable";

  // Private function
  var privateFunction = function privateFunction() {
    console.log("This is a private function");
  }

  // Public function
  var publicFunction = function() {
  		privateFunction();
      console.log("This is a public function");
  }
  // Public interface
  return {
    publicFunction:publicFunction,
    // Public variable accessing private variable
    publicVariable: privateVariable,
  };
})();

Module.publicFunction()
console.log(Module.publicVariable)
console.log(Module.privateVariable)
Module.privateFunction()