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JavaScript Object-Oriented JavaScript Getters and Setters Object Interaction

Naoki Yoshida
Naoki Yoshida
6,984 Points

Phone property results undefined, help!

class Pet {
   constructor(animal, age, breed, sound) {
     this.animal = animal;
     this.age = age;
     this.breed = breed;
     this.sound = sound;

   get activity() {
     const today = new Date();
     const hour = today.getHours();

     if(hour > 8 && hour <= 20) {
      return 'playing';
    } else {
      return 'sleeping'; 

   get owner() {
     return this._owner;

   set owner(owner) {
       this._owner = owner;
      console.log(`setter called: ${owner}`);

   speak() {

class Owner {
  constructor (name, address) {
    this.name = name;
    this.address = address;

  set phoneNumber(phone) {
    const phoneNormalized = phone.replace(/[^0-9]/g, '');
    this._phone = phoneNormalized;

  get phone() {
    return this._phone;


const ernie = new Pet('cat', 4, 'persa','miooou');
const vera = new Pet('dog', 8, 'border collie', 'woof woof');

ernie.owner = new Owner ('Naoki', 'Furogori 202');
ernie.owner.phone = '(090)4235-4545';


2 Answers

Steven Parker
Steven Parker
215,954 Points

In the video, the setter for the phone number is simply named "phone". But in this code it is named "phoneNumber", so it does not get called when you assign ernie.owner.phone = '(090)4235-4545';.

Change the setter function name to "phone" to fix the error.

Naoki Yoshida
Naoki Yoshida
6,984 Points

It worked! Thanks! I hope to get better in those typos.