// prototypes4.js

var House = {
  ringDoorbell: function() {
    console.log("ding dong!");
  },

  describe: function() {
    console.log(this.owner + "'s house has " + this.rooms + " rooms.");
  }
};

var Castle = Object.create(House);
Castle.describe = function() {
  console.log(this.owner + " owns a mighty castle with " + this.rooms + " rooms!");
};

var hearstCastle = Object.create(Castle);
hearstCastle.owner = "William Randolph Hearst";
hearstCastle.rooms = 56;

hearstCastle.describe();
  // Logs: "William Randolph Hearst owns a mighty castle with 56 rooms!"

hearstCastle.ringDoorbell();
  // Logs: "ding dong!"