Showing the principle of javascript scope binding

scope-binding-closure.js

var bob = (function (name) {
  var char = {
    name: name,
    say: function (message) { this.logger(this.name + " says: " + message); },
    logger: function (message) { console.log(message); }
  };

  return char;
})("Bob");

bob.say("hi"); // Bob says: hi
bob.name = "Robert";
bob.say("hi"); // Robert says: hi

bob.logger = function (message) { console.log("[" + Date.parse("01/01/2014") + "]", message); };
bob.say("hi"); // [1388559600000] Robert says: hi

scope-binding.js

var logger = function (message) {console.log(message);};
var Character = function (name) {
  this.name = name;
  this.say = function (message) { logger(this.name + " says: " + message); }
};

var bob = new Character("Bob");
bob.say("hi"); // Bob says: hi

var date = Date.parse("01/01/2014");
logger = function (message) {console.log("[" + date + "]", message);};

bob.say("hello again"); // [1388559600000] Bob says: hello again