We can use the strategy pattern to 'inject' an object with a behaviour.
This can be useful for:
- Changing an object's behaviour at runtime (swapping a strategy)
- Reusing code without introducing new inheritance relationships
Demo: Chess Movement
In Chess, the pieces have different ways of moving around on the board.
To introduce the strategy pattern, we could encapsulate these rules in objects that implement a common interface.
We don't need the strategy pattern to implement traditional Chess, but in the demo it allows us to change how a piece can move at runtime.
The MimicPiece object has a MoveStrategy - which it leverages for its move() behaviour.