The Decorator Pattern attaches additional responsibilites to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality.
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Identify the aspects of your application that vary and separate them from what stays the same
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Program to an interface, not an implementation.
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Favor composition over inheritance.
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Strive for loosely coupled designs between objects that interact.
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Classes should be open for extension, but closed for modification.
