prototypes2.js

// prototypes2.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);

console.log(Object.getPrototypeOf(bobsHouse));
  // Logs: {ringDoorbell: ƒ, describe: ƒ}

console.log(Object.getPrototypeOf(bobsHouse) === House);
  // Logs: true

bobsHouse.describe();
  // Logs: "undefined's house has undefined rooms."

bobsHouse.owner = "Bob Belcher";
bobsHouse.rooms = 4;

bobsHouse.describe();
  // Logs: "Bob Belcher's house has 4 rooms."