Closure Example

closure-example.js

(function () {
	var greeter = (function () {
	  var greeting = "Hey";
	  var name = "you";

	  function setName( newName ) {
		  name = newName;
	  }
	  
	  function greet() {
		  console.log(greeting + " " + name + "!");
	  }

	  return {
		  setName: setName,
		  greet: greet
	  }

	}());

	var john = greeter;

	john.greet(); // will log "Hey you!"

	john.setName("John");
	john.greet(); // will log "Hey John!"
}());