The Facade design pattern can be combined with other design patterns to enhance its functionality. Some of the design patterns that can be combined with Facade are:
1. Singleton pattern: When a Facade uses Singleton pattern, it ensures that only one instance of the Facade object will be created and all calls to the Facade will use the same instance.
2. Adapter pattern: When a client uses an Adapter to communicate with different subsystems, the Adapter can be used as a Facade to simplify the interface and provide a simplified access point for the client.
3. Composite pattern: If a Facade needs to access a group of objects and treat them as a single object, the Composite pattern can be used to create a tree-like structure of objects and provide a simplified interface to the client.
4. Decorator pattern: If a Facade needs to add extra functionality to a subsystem, the Decorator pattern can be used as a wrapper to add the functionality without changing the original subsystem.
5. Factory pattern: When a Facade needs to create objects of different subsystems, the Factory pattern can be used to create the objects and provide a simplified interface to the client.
Overall, the Facade pattern can be combined with other patterns to provide enhanced functionality and simplify the interface between the client and the subsystems.
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