prototypes3.js

// prototypes3.js

var House = {
  ringDoorbell: function() {
    console.log("ding dong!");
  },
  
  describe: function() {
    console.log(this.owner + "'s house has " + this.rooms + " rooms.");
  }
};

var bobsHouse = Object.create(House);
bobsHouse.owner = "Bob Belcher";
bobsHouse.rooms = 4;

console.log(Object.getOwnPropertyNames(bobsHouse));
  // Logs: ["owner", "rooms"]

console.log(bobsHouse.hasOwnProperty("rooms"));
  // Logs: true

console.log(bobsHouse.hasOwnProperty("ringDoorbell"));
  // Logs: false

console.log(Object.getPrototypeOf(bobsHouse).hasOwnProperty("ringDoorbell"));
  // Logs: true