What is the difference between Command Pattern and Strategy Pattern?

What is the difference between Command Pattern and Strategy Pattern?

The Command Pattern encapsulates a request as an object, allowing for parameterization and queuing of requests. The Strategy Pattern, on the other hand, defines a family of algorithms, encapsulates each one, and makes them interchangeable.

Can you give me an example of each pattern?

Sure! In the Command Pattern, a remote control can be a command object that executes different actions like turning on/off a device. In the Strategy Pattern, a sorting algorithm can be a strategy that can be switched out, like using quicksort or mergesort.

When would I use one over the other?

Use the Command Pattern when you need to parameterize actions, support undoable operations, or queue requests. Use the Strategy Pattern when you want to define a family of algorithms and switch between them dynamically.

Are there any drawbacks to using these patterns?

Yes, the Command Pattern can lead to a proliferation of command classes, while the Strategy Pattern can make the code more complex if too many strategies are introduced.