Chapter 20: The Decorator Pattern
As we saw in the previous chapter, using an adapter, the first structural design pattern, you can adapt an object implementing a given interface to implement another interface. This is called interface adaptation and includes the kinds of patterns that encourage composition over inheritance, and it could bring benefits when you have to maintain a large codebase.
A second interesting structural pattern to learn about is the decorator pattern, which allows us to add responsibilities to an object dynamically and transparently (without affecting other objects); this will be the topic of this chapter. Throughout our discussions, we will learn more about a specific usage of this design pattern: memoization.
We will ...
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