text: let _COUNTER = 1;
  let _PREFIX = 111;
  
  function generateID() {
    return parseInt(
      _PREFIX.toString()
        .concat(_COUNTER++)
    );
  }
  
  class User {
    id;
    name;
    surname;
    login;
    email;
    phone;
    avatar = null;
    about = null;
  
    constructor(name, surname, email, phone,) {
      this.id = generateID();
      this.name = name;
      this.surname = surname;
      this.login = this.getLogin();
      this.email = email;
      this.phone = phone;
    }
  
    getLogin() {
      return this.name.toLowerCase()
        .concat("__")
        .concat(this.surname.toLowerCase());
    }
  }