overloading.js

class User {

  add(name, age) {
    this.name = name;
    this.age = age;
    console.log(`Username: ${this.name} age: ${this.age}`);
  }

  add(name) {
    this.name = name;
    console.log(`Username: ${this.name}`);
  }
}


let user = new User();
user.add('Mohanad', 29); // Username: Mohanad