Playground - Encapsula datos de los usuarios

Recalcar que en las pruebas sale Usuario en español en vez de User en ingles, las “boberias” atrasan… 😃

class User {
    // Tu código aquí 👈
    constructor(name,age){
        this._name=name;
        this._age=age;
        this._friends=[];
        this._messages=[];
    }
    addFriend(friend){
        this._friends.push(friend);
    }
    sendMessage(message, friend){
        this._messages.push(message);
        friend._messages.push(message);
    }
    showMessages(){
        return this._messages;
    }
    get name(){
        return this._name;
    }
    set name(name){
       if(name.length>0){
         this._name=name;   
    }   else{
        throw new Error("Agregue un nombre válido");
    }  
    }
    get age(){
        return this._age;
    }
    set age(age){
        if(age>0){
            this._age=age;
        }else{
            throw new Error("Agregue una edad válida");
        }
    }

  }

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export class User {
    constructor(name, age, friends = [], messages = []) {
      this._name = name;
      this._age = age;
      this._friends = friends;
      this._messages = messages;
    }
  
    get name() {
      return this._name;
    }
    set name(newName) {
      this._name = newName;
    }
    get age() {
      return this._age;
    }
    set age(newAge) {
      this._age = newAge;
    }
  
    addFriend(friend) {
      this._friends.push(friend);
    }
  
    sendMessage(message, friend) {
      this._messages.push(message);
      friend._messages.push(message)
    }
  
    showMessages() {
      return this._messages;
    }
}

Si entendieron bien las ultimas dos lecciones, será bien sencillo completar este reto 😃

Sin embargo no puedo dejar de mencionar esto. Trabajo dentro de la industria y estoy haciendo este curso para mejorar mis habilidades y conocimientos en javascript. En algunas ocasiones la documentación en estos retos tiende a ser algo confusa y en otros casos se omiten ciertas informaciones que son necesarias para cumplir el reto. Tomen en cuenta que otros participantes están iniciando en este hermoso mundo de la programación y este tipo de cosas puede llegar a frustrar cuando no sabes como resolverlo.

En mi fue solo un comentario amistoso para mejorar 😃
Aqui les comparto mi solución:

Mi aporte:
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export class User {
  constructor(name, age) {
    this._name = name;
    this._age = age;
    this._friends = [];
    this._messages = [];
  }

  get name() {
    return this._name;
  }

  set name(newName) {
    return (this._name === '') ? 'El nombre no puede estar vacio' : this._name = newName;
  }

  get age() {
    return this._age;
  }

  set age(newAge) {
    return (this._age < 0) ? 'No es posible tener una edad menor a 0' : this._age = newAge;
  }

  addFriend(friend) {
    this._friends.push(friend);
  }

  sendMessage(message, friend) {
    this._messages.push(message);
    friend._messages.push(message);
  }

  showMessages() {
    return this._messages;
  }
}

Mi aporte

export class User {
  constructor(name, age) {
    this._name = name;
    this._age = age;
    this._friends = [];
    this._messages = [];
  }

  get age() {
    return this._age;
  }

  get name() {
    return this._name;
  }

  set name(name) {
    this._name = name;
  }
  set age(age) {
    this._age = age;
  }

  addFriend(friend) {
    this._friends.push(friend);
  }

  sendMessage(message, friend) {
    this._messages.push(message);
    friend._messages.push(message);
  }

  showMessages() {
    return this._messages;
  }
}

Desafio superado!

🛡️🛡️🛡️Escudo anti spoilers🛡️🛡️🛡️

Encapsula datos del usuaio

export class User {
  // Tu código aquí 👈
  constructor(name, age) {
    this._name = name;
    this._age = age;
    this._friends = [];
    this._messages = [];
  }

  // Setters

  set message(newMessage) {
    if (newMessage !== "") {
      this._messages.push(newMessage);
    }
  }

  set name(newName) {
    if (newName !== "") {
      this._name = newName;
      return;
    }
    throw new Error("The name must not be empty");
  }

  set age(newAge) {
    if (newAge > 0) {
      this._age = newAge;
      return;
    }
    throw new Error("The new age should be positive");
  }

  // Getters

  get name() {
    return this._name;
  }

  get age() {
    return this._age;
  }

  addFriend(amigo) {
    if (amigo instanceof User) {
      this._friends.push(amigo);
    }
  }

  sendMessage(message, friend) {
    if (typeof message === "string" && friend instanceof User) {
      this._messages.push(message);
      friend.message = message;
    }
  }

  showMessages() {
    return this._messages;
  }
}

Mi solución 💚

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class User {
  constructor(name, age) {
    this._name = name
    this._age = age
    this._friends = []
    this._messages = []
  }

  addFriend(friend) {
    this._friends.push(friend)
  }

  sendMessage(message, friend) {
    this._messages.push(message)
    friend._messages.push(message)
  }

  showMessages() {
    return this._messages
  }

  get name() {
    return this._name
  }

  set name(name) {
    this._name = name
  }

  get age() {
    return this._age
  }

  set age(age) {
    this._age = age
  }

}

export class User {
  constructor(name, age) {
    this._name = name
    this._age = age
    this._friends = [] // obj[]
    this._messages = [] // string[]
  }

  addFriend(friend) {
    this._friends.push(friend)
  }

  sendMessage(message, friend) {
    this._messages.push(message)
    friend._messages.push(message)
  }

  showMessages() {
    return this._messages
  }

  get name() {
    return this._name
  }
  set name(string) {
    if (typeof string === "string" && string.length !== 0) {
      this._name = string
    }
  }
  get age() {
    return this._age
  }
  set age(n) {
    if (n > 0) {
      this._age = n
    }
  }
}

Mi aporte:
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export class User {
  // Tu código aquí 👈
  constructor(name, age) {
    this._name= name;
    this._age = age;
    this._friends = [];
    this._messages = [];
  }
  get name() {
    return this._name;
  }
  set name(newName) {
    this._name = newName;
  }

  get age() {
    return this._age;
  }

  set age(number) {
    this._age = number;
  }

  addFriend(friend) {
    this._friends.push(friend);
  }

  sendMessage(message, friend) {
    this._messages.push(message);
    friend._messages.push(message);
  }

  showMessages() {
    return this._messages;
  }
}
 

Hola, Comparto la solución del Reto:

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export class User {
  constructor(name, age) {
    this._name = name;
    this._age = age;
    this._friends = [];
    this._messages = [];
  }

  addFriend(friend) {
    this._friends.push(friend);
  }

  sendMessage(message, friend) {
    this._messages.push(message);
    friend?.sendMessage(message, null);
  }

  showMessages() {
    return this._messages;
  }

  get name() {
    return this._name;
  }

  set name(newName) {
    this._name = newName;
  }

  get age() {
    return this._age;
  }

  set age(newAge) {
    this._age = newAge;
  }
}

export class User {
  constructor(name, age) {
    this._name = name;
    this._age = age;
    this._friends = [];
    this._messages = [];
  }

  addFriend(friend) {
    this._friends.push(friend)
  }
  sendMessage(message, friend) {
    this._messages.push(message)
    friend._messages.push(message);
  }
  showMessages() {
    return this._messages;
  }
  get name() {
   return this._name;
  }
  set name(newName) {
    this._name = newName;
  }
  get age() {
    return this._age;
  }
  set age(newAge) {
    this._age = newAge;
  }
}

Mi solución:
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export class User {
    constructor(name,age){
        this._name=name;
        this._age=age;
        this._friends = [];
        this._messages = [];
    }
    get name(){
        return this._name;
    }
    addFriend(friend){
        this._friends.push(friend);
    }
    sendMessage(message,friend){
        this._messages.push(message);
        friend._messages.push(message);
    }
    showMessages(){
        return this._messages;
    }
    set name(newName){
        this._name = newName;
    }
    get age(){
        return this._age;
    }
    set age(newAge){
        this._age = newAge;
    }
}

Mi solución

export class User {
  constructor(name, age, friends = [], messages = []) {
    this._name = name;
    this._age = age;
    this._friends = friends;
    this._messages = messages;
  }

  get name() {
    return this._name;
  }
  set name(newName) {
    this._name = newName;
  }
  get age() {
    return this._age;
  }
  set age(newAge) {
    this._age = newAge;
  }

  addFriend(friend) {
    this._friends.push(friend);
  }

  sendMessage(message, friend) {

    this._messages.push(message);

    if (friend) {
      friend.sendMessage(message)
    }
  }

  showMessages() {
    return this._messages;
  }

}

🛡️🛡️Escudo anti-spoilers🛡️🛡️

Mi solución al reto:

export class User {
  constructor(name, age, friends, messages) {
    this._name = name;
    this._age = age;
    this._friends = friends || [];
    this._messages = messages || [];
  }

  addFriend(friend) {
    this._friends.push(friend)
  }

  set message(msg) {
    this._messages.push(msg)
  }

  sendMessage(message, friend) {
    // buscar al amigo y agregarle el mensaje
    console.log('hola amigo ', friend.name, friend)
    this._friends = this._friends.map((user) => {
      if (user.name === friend.name) {
        console.log('aqui', user.name, friend.name)
        user.message = message
        console.log('mensajes', user)
      }
      return user
    })
    this.message = message
  }

  showMessages() {
    return this._messages
  }

  get name() {
    return this._name;
  }

  set name(value) {
    this._name = value
  }

  get age() {
    return this._age
  }

  set age(age) {
    this._age = age
  }

}

Curiosamente ChatGPT usa # para marcar los elementos privados, y por otro lado si defino las variables privadas fuera del constructor parece no funcionar, por lo que he tenido que adaptar solucion
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export class User {

  constructor(name, age) {
    this._name = name;
    this._age = age;
    this._friends = [];
    this._messages = [];
  }

  addFriend(friend) {
    this._friends.push(friend);
  }

  sendMessage(message, friend) {
    this._messages.push(`${message}`);
    friend._messages.push(`${message}`);
  }

  showMessages() {
    return this._messages;
  }

  // Getters y setters
  get name() {
    return this._name;
  }

  set name(newName) {
    this._name = newName;
  }

  get age() {
    return this._age;
  }

  set age(newAge) {
    this._age = newAge;
  }
}

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Original de GPT4

class Usuario {
  #name;
  #age;
  #friends = [];
  #messages = [];

  constructor(name, age) {
    this.#name = name;
    this.#age = age;
  }

  addFriend(friend) {
    this.#friends.push(friend);
    friend.#friends.push(this);
  }

  sendMessage(message, friend) {
    this.#messages.push(`Yo: ${message}`);
    friend.#messages.push(`${this.#name}: ${message}`);
  }

  showMessages() {
    return this.#messages;
  }

  // Getters y setters
  get name() {
    return this.#name;
  }

  set name(newName) {
    this.#name = newName;
  }

  get age() {
    return this.#age;
  }

  set age(newAge) {
    this.#age = newAge;
  }
}

// Ejemplo de uso
const usuario1 = new Usuario("Juan", 20);
const usuario2 = new Usuario("Maria", 25);

usuario1.addFriend(usuario2);
usuario1.sendMessage("Hola Maria!", usuario2);

console.log(usuario1.showMessages()); // ["Yo: Hola Maria!"]
console.log(usuario2.showMessages()); // ["Maria: Hola Maria!"]

Solucion

class User {
  #name;
  #age;
  #friends;
  #messages;

  constructor(name, age) {
    this.#name = name;
    this.#age = age;
    this.#friends = [];
    this.#messages = [];
  }

  addFriend(friend) {
    this.#friends.push(friend);
  }

  sendMessage(message, friend) {
    if (this.#friends.some((user) => friend.#name === user.#name)) {
      this.#messages.push(message);
    }
    
  }

  showMessages() {
    console.log(this.#messages);
    return this.#messages;
  }

  get #privateName() {
    return this.#name;
  }

  set #privateName(newName) {
    this.#name = newName;
    return this.#name;
  }

  get #privateAge() {
    return this.#age;
  }

  set #privateAAge(newAge) {
    this.#age = newAge;
    return this.#age;
  }
}

🛡️Escudo anti-spoilers🛡️

Mi solucion:

export class User {
  constructor(name, age) {
    this._name = name;
    this._age = age;
    this._friends = [];
    this._messages = [];
  }
  addFriend(friend) {
    this._friends.push(friend)
  }
  sendMessage(message, friend) {
    const users = [this, friend]
    for (const user of users) {
      user.addMessage(message)
    }
  }
  addMessage(message) {
    this._messages.push(message)
  }
  showMessages() {
    return this._messages
  }

  get name() {
    return this._name
  }
  set name(name) {
    this._name = name
  }
  get age() {
    return this._age
  }
  set age(age) {
    this._age = age
  }
}

mi Aporte, hice algunas implicaciones,

export class User {
  constructor(name, age, friends, messages) {
    this._name = name;
    this._age = age;
    this._friends = [];
    this._messages = [];
  }
  addFriend(friend) {
    if (!this._friends.find(x => x.name == friend.name)) {
      this._friends.push(friend);
    }
  }
  sendMessage(message, friend) {
    if (this._friends.find(x => x.name == friend.name)) {
      this._messages.push(message);
      friend._messages.push(message);

    }
  }

  showMessages() {
    return this._messages;
  }

  get name() {
    return this._name;
  }
  set name(newName) {
    if (newName != '') {
      this._name = newName;
    } else {
      throw new Error('El Nombre no es valido');
    }
  }
  get age() {
    return this._age;
  }
  set age(newAge) {
    if (newAge != 0) {
      this._age = newAge;
    } else {
      throw new Error('la Edad no es valida');
    }
  }

}

Mi solucion
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class User {
    constructor(name, age) {
        this._name = name,
        this._age = age,
        this._friends = [],
        this._messages = []
    }
    addFriend(friend) {
        this._friends.push(friend)
    }
    sendMessage(message, friend) {
        console.log(friend);
        if (this._friends.some(friendAdded =>friendAdded._name === friend._name)) {            
            this._messages.push(message) && friend._messages.push(message)
        }else {
            console.log('no tienes a este usuario agregado a tu lista de amigos');
        }
    }
    showMessages() {
        return this._messages
    }
    get name() {
        return this._name;
    }
    set name(newName) {
        !newName ? console.log("El nombre no puede estar vacío") : this._name = newName
    }
    get age() {
        return this._age;
    }
    set age(newAge) {
        newAge <= 0 ? console.log("La edad no puede ser un numero negativo") : this._age = newAge
    }
}

Aqui esta es que todavía me cuesta entender, pero creo que ya me estoy dando una idea
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export class User {
  // Tu código aquí 👈
  constructor(name, age) {
    this._name = name;
    this._age = age;
    this._friends = [];
    this._messages = [];
  }
  get name() {
    return this._name;
  }
  set name(name) {
    this._name = name;
  }
  get age() {
    return this._age;
  }
  set age(age) {
    this._age = age;
  }
  addFriend(friend) {
    this._friends.push(friend);
  }
  sendMessage(message, friend) {
    this._messages.push(message);
    friend._messages.push(message);
  }
  showMessages() {
    return this._messages;
  }
}

¡Hola, Desafío cumplido 😃!

Mi solución,
Se detalla hasta abajo.⬇
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export class User {
  constructor(name, age) {
    this._name     = name;
    this._age      = age;
    this._friends  = [];
    this._messages = [];
   
  }

  addFriend(friend) {
    this._friends.push(friend);
  }

  sendMessage(message, friend=null) {
    this._messages.push(message);
    if (friend!=null)
      friend.sendMessage(message);
  }
  showMessages()
  {
    return this._messages;
  }

  get name() {
    return this._name;
  }

  set name(newName) {
    if (newName === "") {
      throw new("El nombre no puede estar vacío");
    } else {
      this._name = newName;
    }
  }
  get age() {
    return this._age;
  }

  set age(newAge) {
    if (newAge === 0) {
      throw new("La edad no puede ser 0");
    } else {
      this._age = newAge;
    }
  }
}

Aquí mi solución:
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export class User {
  constructor(name, age) {
    this._name = name
    this._age = age
    this._friends = []
    this._messages = []
  }

  //agrega un usuario a la lista de amigos del usuario actual.
  addFriend(friend) {
    this._friends.push(friend);
  }

  //agrega un mensaje a la lista de mensajes del usuario actual y al amigo especificado.
  sendMessage(message, friend) {
    this._messages.push(message);
    let index = this._friends.findIndex(item => item.name === friend.name)
    if (index >= 0) {
      friend.message = message;
    }
  }

  //devuelve la lista de mensajes del usuario actual
  showMessages() {
    return this._messages;
  }

  //para los datos privados como el nombre y la edad, 
  get name() {
    return this._name;
  }

  set name(newname) {
    this._name = newname;
  }

  get age() {
    return this._age;
  }

  set age(newage) {
    this._age = newage;
  }

  set message(newmessage) {
    this._messages.push(newmessage);
  }
}

export class User {
  // Tu código aquí 👈
  constructor(name, age) {
    this._name = name
    this._age = age
    this._friends = []
    this._messages = []
  }

  addFriend(friend) {
    this._friends.push(friend)
  }

  sendMessage(message, friend) {
    const index = this._friends.findIndex((f) => friend.name === f.name)
    console.log(this._friends[index])
    this._friends[index].messages.push(message)
    this._messages.push(message)
  }

  showMessages() {
    return this._messages
  }

  get age() {
    return this._age
  }
  
  set age(value) {
    this._age = value
  }

  get name() {
    return this._name
  }

  set name(value) {
    this._name = value
  }

  get messages() {
    return this._messages
  }

  set messages(value) {
    this._messages = value
  }

}

Hola, comparto mi solución:
 
 
 
 
 
 
 
 
 
 
 
 

export class User {
  constructor(name, age, friends = [], messages = []) {
    this._name = name
    this._age = age
    this._friends = friends
    this._messages = messages
  }

  get name() {
    return this._name
  }

  set name(name) {
    this._name = name
  }

  get age() {
    return this._age
  }

  set age(age) {
    this._age = age
  }

  addFriend(friend) {
    this._friends.push(friend)
  }

  sendMessage(message, friend) {
    this._messages.push(message)
    friend.getMessage(message)
  }

  getMessage(message) {
    this._messages.push(message)
  }

  showMessages() {
    return this._messages
  }

}

¿Porque en el método sendMessage se accede a la variable privada _messages del usuario friend? se supone que es privada y no se debería poder modificar de esta forma.

sendMessage(message, friend) {
	this._messages.push(message);
	friend._messages.push(message);
}

Creo que la mejor manera de hacer esto sería definiendo un setter para la propiedad _messages.

pd: Esta solución es la que se muestra después de quedarse sin intentos.

Agregue un nuevo setter para poder acceder a la variable privada _.messages de friend

export class User {
  constructor(name, age) {
    this._name = name;
    this._age = age;
    this._friends = [];
    this._messages = [];
  }

  addFriend(friend) {
    this._friends.push(friend);
  }
  sendMessage(message, friend) {
    this._messages.push(message);
    friend.message = message;
  }
  showMessages() {
    return this._messages;
  }
  get age() {
    return this._age;
  }
  get name() {
    return this._name;
  }
  set age(newAge) {
    this._age = newAge;
  }
  set name(newName) {
    this._name = newName;
  }
  set message(newMessage) {
    this._messages.push(newMessage);
  }
}

Hola, me gustaría compartirles mi solución
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class User {
    constructor(name, age) {
        this._name = name;
        this._age = age;
        this._friends = [];
        this._messages = [];
    }

    set name(newName) {
        this._name = newName;
    }
    get name() {
        return this._name;
    }

    set age(newAge) {
        this._age = newAge;
    }
    get age() {
        return this._age;
    }

    addFriend(friend) {
        this._friends.push(friend);
    }

    sendMessage(message, friend) {
        this._messages.push(message);
        friend.receiveMessage(message);
    }

    receiveMessage(message) {
        this._messages.push(message);
    }

    showMessages() {
        return this._messages;
    }
}

Mi solucion:
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export class User {
  constructor(name, age) {
    this._name = name;
    this._age = age;
    this._friends = [];
    this._messages = [];
  }

  get name() {
    return this._name;
  }

  set name(name) {
    this._name = name;
  }

  get age() {
    return this._age;
  }

  set age(age) {
    this._age = age;
  }

  addFriend(friend) {
    this._friends.push(friend);
  }

  sendMessage(message, friend) {
    if (this._friends.includes(friend)) {
      this._friends.find(() => friend)._messages.push(message);
      this._messages.push(message);
    }
  }

  showMessages() {
    return this._messages;
  }
}

Mi solucion:

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export class User {

  // atributes
  _friends = [];
  _messages = [];

  constructor(name, age) {
    this._name = name;
    this._age = age;
  }

  // getters and setters
  set name(name) {
    this._name = name;
  }
  get name() {
    return this._name;
  }
  set age(age) {
    this._age = age;
  }
  get age() {
    return this._age;
  }


  //methods

  addFriend(friend) {
    this._friends.push(friend)
  }

  sendMessage(message, friend) {
    this._messages.push(message)
    friend._messages.push(message)
  }

  showMessages() {
    return this._messages;
  }

}

Mi solución:
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export class User {
  constructor(name, age) {
    this._name = name
    this._age = age
    this._friends = []
    this._messages = []
  }

  get name() {
    return this._name
  }

  set name(newName) {
    this._name = newName
  }

  get age() {
    return this._age
  }

  set age(newAge) {
    this._age = newAge
  }

  addFriend(friend) {
    if (friend instanceof User)
      this._friends.push(friend)
  }

  sendMessage(message, friend) {
    if (this._friends.some(friends => friends.name === friend.name))
      this._messages.push(message)
      friend._messages.push(message)
  }

  showMessages() {
    return this._messages
  }
}

considero la siguiente parte de la guia poco especifica
agrega un mensaje a la lista de mensajes del usuario actual y al amigo especificado.

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Mi solucion:

export class User {
  _name;
  _age;
  _friends = [];
  _messages = [];

  constructor(name, age) {
    this._name = name;
    this._age = age;
  }

  addFriend(friend){
    this._friends.push(friend);
  }
  sendMessage(message, friend){
    this._messages.push(message);
    friend._messages.push(message);
  }
  showMessages(){
    return this._messages;
  }
  set name(newName) {
    this._name = newName;
  }
  get name() {
    return this._name;
  }
  set age(newAge) {
    this._age = newAge;
  }
  get age() {
    return this._age;
  }

}

Mi solución:

export class User {
  constructor(name, age) {
    this._name = name
    this._age = age
    this._friends = []
    this._messages = []
  }
  get name() { return this._name }
  get age() { return this._age }
  set name(name) { this._name = name }
  set age(age) { this._age = age }
  addFriend(friend) { this._friends.push(friend) }
  sendMessage(message, friend) {
    this._messages.push(message)
    friend._messages.push(message)
  }
  showMessages() { return this._messages }
}

Mi solución

No es un jefe, pero si fue interesante saber como usar el encapsulamiento dentro de JavaScript.
Cada día los retos se ponen más entretenidos ( •̀ ω •́ )✧
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export class User {
  constructor(name, age) {
    this._name = name;
    this._age = age;
    this._friends = [];
    this._messages = [];
  }
  
  addFriend(friend) {
    this._friends.push(friend);
  }

  saveMessage(message) {
    this._messages.push(message);
  }

  sendMessage(message, friend) {
    this.saveMessage(message);
    friend.saveMessage(message);
  }
  showMessages() {
    return this._messages;
  }

  set name(name) {
    this._name = name;
  }
  get name() {
    return this._name;
  }

  set age(age) {
    this._age = age;
  }
  get age() {
    return this._age;
  }

}

ATENCIÓN: Si han llegado hasta aquí para poder realizar este ejercicio deben pasar todos los métodos y propiedades al inglés o no podrán correr los test.

Si se quieres ahorrar tiempo las propiedades son: name, age, friends y messages.

Los métodos son: addFriend, sendMessage y showMessages

Ahora mi solución:

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export class User {
  constructor(name, age, friends= [], messages = []) {
    this._name = name
    this._age = age
    this._friends = friends
    this._messages = messages
  }

  addFriend(friend) {
    this._friends.push(friend)
  }

  sendMessage(message, friend) {
    this._messages.push(message)
    friend.messages = [...friend.messages, message]
  }

  showMessages() {
    return this._messages
  }

  get name() {
    return this._name
  }

  set name(newName) {
    this._name = newName
  }

  get age() {
    return this._age
  }

  set age(newAge) {
    this._age = newAge
  }

  get messages() {
    return this._messages
  }

  set messages(newMessages) {
    this._messages = newMessages
  }
}

MI SOLUCION 💪
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export class User {
  constructor(name, age) {
    this._name = name;
    this._age = age;
    this._friends = [];
    this._messages = [];
  }

  get name() {
    return this._name;
  }

  set name(name) {
    this._name = name;
  }

  get age() {
    return this._age;
  }

  set age(age) {
    this._age = age;
  }

  addFriend(friend) {
    this._friends.push(friend);
  }

  sendMessage(message, friend) {
    this._messages.push(message);
    friend.receiveMessage(message);
  }

  receiveMessage(message) {
    this._messages.push(message);
  }

  showMessages() {
    return this._messages;
  }
}

Solución… 😄
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Para el ejercicio, se debe implementar el constructor de la clase User y los métodos correspondientes al reto.
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Se debe utilizar el carácter “_” (antes del nombre de la propiedad) para proteger las propiedades de la clase.
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NOTA: En el método sendMessage(message, friend) se refiere a que ambos usuarios deben agregar el mensaje a su correspondiente lista de mensajes.
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Código:
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export class User {
  constructor(name, age) {
    this._name = name;
    this._age = age;
    this._friends = [];
    this._messages = [];
  }

  addFriend(friend) {
    this._friends.push(friend);
  }

  sendMessage(message, friend) {
    this._messages.push(message);
    friend._messages.push(message);
  }

  showMessages() {
    return this._messages;
  }

  get name() {
    return this._name;
  }

  set name(newName) {
    this._name = newName;
  }

  get age() {
    return this._age;
  }

  set age(newAge) {
    this._age = newAge;
  }
}

El problemita que me demoró un poquito de este ejercicio, fué en el envío del mensaje recíproco al friend, aunque creo que en un sistema real, el envío de este mensaje debería realizarse fuera del scope de del cualquier objeto.
Aquí mi solución:

export class User {
  constructor(name, age) {
    this._name = name;
    this._age = age;
    this._friends = [];
    this._messages = [];
  }
  get name() {
    return this._name;
  }
  set name(newName) {
    if (newName != "")
      this._name = newName;
    else
      console.log("El nombre no puede ser un string vacío");
  }

  get age() {
    return this._age;
  }
  set age(newAge) {
    if (newAge > 0)
      this._age = newAge;
    else
      console.log("La edad debe ser un valor mayor a cero");
  }
  get messages() {
    return this._messages;
  }
  set messages(message) {
    this._messages.push(message);
  }
  addFriend(friend) {
    this._friends.push(friend);
  }
  sendMessage(message, friend) {
    this._messages.push(message);
    friend.messages = message;
  }
  showMessages() {
    return this._messages;
  }
}

Hola, dejo mi solucion
Caminito anti spoilers
🛴✨
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Llegamos 📍

export class User {
  // Tu código aquí 👈
  constructor(name, age, friends = [], messages = []) {
    this._name = name;
    this._age = age;
    this._friends = friends;
    this._messages = messages;
  }
  addFriend(friend) {
    this._friends.push(friend)
  }
  sendMessage(message, friend) {
    this._messages.push(message);
    friend._messages.push(message)
  }
  showMessages() {
    return this._messages;
  }
  get name() {
    return this._name;
  }
  set name(newName) {
    this._name = newName;
  }
  get age() {
    return this._age;
  }
  set age(newAge) {
    this._age = newAge;
  }
}

MI solución:

class User {
  constructor(name,age,friends=[],messages=[]){
    this._name=name;
    this._age=age;
    this._friends=friends;
    this._messages=messages;
  };
  addFriend(friend){
    this._friends.push(friend);
  };
  sendMessage(message, friend){
    this._messages.push(message)
    return friend._messages.push(message)
  };
  showMessages(){
    return this.messages;
  };

  get name(){
    return this._name;
  };

  set name(newName){
    this._name=newName;
  };


  get age(){
    return this._age;
  };

  set age(newAge){
this._age=newAge;
  };

  get friends(){
    return this._friends;
  };

  set friends(newFriend){
    addFriend(newFriend);
  };


  get messages(){
    return this._messages;
  };

  set messages(newMessage){
    
    sendMessage(newMessage, friend);
    
  };
}

Dejo mi solución:

export class User {
  // Tu código aquí 👈
  constructor(name, age, friends, messages) {
    this._name = name,
      this._age = age,
      this._friends = [],
      this._messages = []
  };

  get name() {
    return this._name
  };

  set name(newName) {
    this._name = newName
  };

  get age() {
    return this._age
  };

  set age(newAge) {
    this._age = newAge
  };

  get friends() {
    return this._friends;
  };

  set friends(newFriends) {
    this._friends = newFriends
  };

  get messages() {
    return this._messages;
  };

  set messages(newMessages) {
    this._messages = newMessages
  };


  addFriend(friend) {
    this.friends.push(friend)
  };

  sendMessage(message, friend) {

    this.messages.push(message);

    for (let i = 0; i < this.friends.length; i++) {

      if (this.friends[i].name === friend.name) {

        this.friends[i].messages.push(message)

      }

    };

  };

  showMessages() {
    return this._messages
  }
}

Mi solucion:
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export class User {
constructor(name, age, friends = [], messages = []) {
this._name = name;
this._age = age;
this._friends = friends;
this._messages = messages;
}
get age() { return this._age; }

get name() { return this._name }

set age(age) {
if (age > 0) {
this._age = age
}
}

set name(name) {
this._name = name;
}

addFriend(friend) { this._friends.push(friend) }

sendMessage(message, friend) {
this._messages.push(message);
friend._messages.push(message)
}

showMessages() {
return this._messages;
}
}

Solución.

export class User {
  // Tu código aquí 👈
  constructor(name, age) {
    this._name = name;
    this._age = age;
    this._friends = [];
    this._messages = [];
  }

  set name(newName) {
    if (newName === "")
      console.log("El nombre no puede estar vacío");
    else
      this._name = newName;
  }

  get name() {
    return this._name;
  }

  set age(newAge) {
    if (newAge === "")
      console.log("La edad no puede estar vacía");
    else
      this._age = newAge;
  }

  get age() {
    return this._age;
  }

  set message(newMessage) {
    if (newMessage === "") {
      console.log("No existe el mensaje");      
    } else {
      this._messages.push(newMessage);
    }
  }

  addFriend(friend) {
    this._friends.push(friend);
  }

  sendMessage(message, friend) {
    this._messages.push(message);
    friend.message = message;
  }

  showMessages() {
    return this._messages;
  }
}

Mi solución
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export class User {
  // Tu código aquí 👈
  constructor(nombre, edad) {
    this._name = nombre
    this._age = edad
    this._friends = []
    this._messages = []
  }

  set name(nombre) {
    this._name = nombre
  }

  get name() {
    return this._name
  }

  set age(age) {
    this._age = age
  }

  set message(message) {
    this._messages.push(message)
  }

  get age() {
    return this._age
  }

  addFriend(friend) {
    this._friends.push(friend)
  }

  sendMessage(message, friend) {
    this._messages.push(message)
    friend.message = message
  }

  showMessages() {
    return this._messages
  }
}