js-object-VI.js

    class User {
      constructor(firstName, lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
      }

      sayHello() {
        console.log(`Hello ${this.firstName} ${this.lastName}`);
      }
    }

    const user1 = new User('Erdem', 'Uslu');
    const user2 = new User('John', 'Smith');