prototypes5.js

// prototypes5.js

function crawlPrototypeChain(obj) {
  console.log("-----------------");
  console.log("Object: ", obj);
  console.log("Own Properties: ", Object.getOwnPropertyNames(obj));
  
  var objPrototype = Object.getPrototypeOf(obj);
  if (objPrototype) {
    crawlPrototypeChain(objPrototype);
  }
}

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 castle with " + this.rooms + " rooms!");
};

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

crawlPrototypeChain(hearstCastle);

/* LOGS: 

-----------------
Object:  {owner: "William Randolph Hearst", rooms: 56}    // hearstCastle
Own Properties:  ["owner", "rooms"]

-----------------
Object:  {describe: ƒ}                                    // Castle
Own Properties:  ["describe"]

-----------------
Object:  {ringDoorbell: ƒ, describe: ƒ}                   // House
Own Properties:  ["ringDoorbell", "describe"]

-----------------
Object:  {constructor: ƒ,                                 // Object.prototype
          __defineGetter__: ƒ,
          __defineSetter__: ƒ,
          hasOwnProperty: ƒ,
          __lookupGetter__: ƒ, 
          … }
Own Properties: ["constructor", "__defineGetter__", "__defineSetter__", 
                 "hasOwnProperty", "__lookupGetter__", "__lookupSetter__",
                 "isPrototypeOf", "propertyIsEnumerable", "toString", "valueOf",
                 "__proto__", "toLocaleString"]

*/