class SimpleCoffee {
  getCost() { return 10; }
  getDescription() { return "일반 커피"; }
}

class MilkDecorator {
  constructor(coffee) { this.coffee = coffee; }
  getCost() { return this.coffee.getCost() + 2; }
  getDescription() { return this.coffee.getDescription() + ", 우유 추가"; }
}

class SugarDecorator {
  constructor(coffee) { this.coffee = coffee; }
  getCost() { return this.coffee.getCost() + 1; }
  getDescription() { return this.coffee.getDescription() + ", 설탕 추가"; }
}

let coffee = new SimpleCoffee();
coffee = new MilkDecorator(coffee);
coffee = new SugarDecorator(coffee);
console.log(coffee.getDescription(), "/ 가격: $" + coffee.getCost());