نمط Decorator

// Component interface
class Coffee {
  cost() {
    return 0;
  }

  description() {
    return '';
  }
}

// Concrete Component
class Espresso extends Coffee {
  cost() {
    return 10;
  }

  description() {
    return 'إسبريسو';
  }
}

// Base Decorator
class CoffeeDecorator extends Coffee {
  constructor(coffee) {
    super();
    this.coffee = coffee;
  }

  cost() {
    return this.coffee.cost();
  }

  description() {
    return this.coffee.description();
  }
}

// Concrete Decorators
class MilkDecorator extends CoffeeDecorator {
  cost() {
    return this.coffee.cost() + 3;
  }

  description() {
    return `${this.coffee.description()} + حليب`;
  }
}

class SugarDecorator extends CoffeeDecorator {
  cost() {
    return this.coffee.cost() + 1;
  }

  description() {
    return `${this.coffee.description()} + سكر`;
  }
}

class CreamDecorator extends CoffeeDecorator {
  cost() {
    return this.coffee.cost() + 5;
  }

  description() {
    return `${this.coffee.description()} + كريمة`;
  }
}

// الاستخدام
let coffee = new Espresso();
coffee = new MilkDecorator(coffee);
coffee = new SugarDecorator(coffee);
coffee = new CreamDecorator(coffee);

console.log(coffee.description()); // إسبريسو + حليب + سكر + كريمة
console.log(coffee.cost()); // 19

from abc import ABC, abstractmethod

class Coffee(ABC):
    @abstractmethod
    def cost(self):
        pass

    @abstractmethod
    def description(self):
        pass

class Espresso(Coffee):
    def cost(self):
        return 10

    def description(self):
        return "إسبريسو"

class CoffeeDecorator(Coffee):
    def __init__(self, coffee):
        self._coffee = coffee

    def cost(self):
        return self._coffee.cost()

    def description(self):
        return self._coffee.description()

class Milk(CoffeeDecorator):
    def cost(self):
        return self._coffee.cost() + 3

    def description(self):
        return f"{self._coffee.description()} + حليب"

coffee = Milk(Espresso())
print(coffee.description(), coffee.cost())  # إسبريسو + حليب 13