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Design Patterns: Command Pattern        
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A Command Pattern allows requests to an object to exist as an object. What does that mean? It means that if you send a request for some function to an object, the command object can house that request inside the object. This is useful in the case of undoing or redoing some action, or simply storing an action in a request queue on an object. When you send the request, it is stored in the object. Then later, if you need to access that same request, or apply the request or some method on the request to an object, you can use the request object instead of calling the objectís method directly.

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