js-object-II.js

    const createUser = (firstName, lastName) => {
      const user = {};
      user.firstName = firstName;
      user.lastName = lastName;
      user.sayHello = function() {
        console.log(`Hello ${this.firstName} ${this.lastName}`);
      }

      return user;
    }

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