Decorator Design Pattern

The Decorator Pattern is one of the structural design patterns in software engineering.

The pattern allows additional functionalities to be dynamically added to objects without altering their structure.

Use Cases

1. Pizza Customization

• Base Object: A plain pizza.
• Decorators: Add-ons like extra cheese, mushrooms, or vegetables.
• Start with a base pizza.
• Wrap it with “extra cheese” decorator → Result: Base Pizza + Extra Cheese.
• Wrap again with “mushroom” decorator → Result: Base Pizza + Extra Cheese + Mushrooms.
• Add as many decorators as desired.

2. Coffee Customization

• Base Object: A cup of coffee.
• Decorators: Additional ingredients like cream, milk, or sugar.
• Start with plain coffee.
• Add “extra milk” decorator → Result: Coffee + Extra Milk.
• Add “cream” decorator → Result: Coffee + Extra Milk + Cream.

3. Car Customization

• Base Object: A basic car.
• Decorators: Features like air conditioning, power steering, or custom seats.