Decorator

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Add behavior dynamically without modifying class. Attach additional responsibilities to an object dynamically, providing a flexible alternative to subclassing for extending functionality. Decorators wrap the original object and delegate to it.

Key Properties

• Wrapping Delegation
• Stackable Behaviors
• Interface Conformance

Related

• Proxy (controls access, decorator adds behavior)
• Composition vs Inheritance (decorator uses composition)
• Middleware Pipeline (chain of decorators)

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design-patterns structural decorator