Inheritance.js

class User {
  constructor(name) {
    this.name = name;
  }
  
  sayHi() {
    console.log(`Hi, ${this.name}`);
  }
}

class Admin extends User {
  constructor(name) {
    super(name);
    this.isAdmin = true;
  }    
}

let admin = new Admin('Mohanad');
console.log(admin.isAdmin); // true