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//Sub Classes, ES6 Inheritance and extending classes

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

  greeting(){
    return `Hello there ${this.firstName} ${this.lastName}`
  }
}

class Customer extends Person {
  constructor(firstName, lastName, phone, membership){
    super(firstName, lastName);

    this.phone = phone;
    this.membership = membership;
  }
  static getMembershipCost(){
    return 500;
  }
}

const john = new Customer('John', 'Doe', '555-555-5555', 'Standard');

console.log(john);
console.log(john.greeting());
console.log(Customer.getMembershipCost());