Как работает метод конструктор в js?

class User {
  constructor(name, surname, profession) {
    this.name = name;
    this.surname = surname;
    this.profession = profession;
  }

  // после конструктора объявляем нужные методы  
  getIntroduce() {
    return `Hi! My name is ${this.name} ${this.surname} and I'm a ${this.profession}.`;
  }
}

const currentUser = new User('John', 'Wick', 'developer');

console.log(currentUser); // => User { name: 'John', surname: 'Wick', profession: 'developer' }

console.log(currentUser.profession); // => developer

console.log(currentUser.getIntroduce()); // => Hi! My name is John Wick and I'm a developer.