While creational patterns play the part of flexibly creating objects, structural patterns, on the other hand, are patterns about composing objects. In this chapter, we are going to talk about structural patterns that fit different scenarios.
If we take a closer look at structural patterns, they can be divided into structural class patterns and structural object patterns. Structural class patterns are patterns that play with "interested parties" themselves, while structural object patterns are patterns that weave pieces together (like Composite Pattern). These two kinds of structural patterns complement each other to some degree.
Here are the patterns we'll walk through in this chapter:
Composite: Builds tree-like structures using primitive and composite objects. A good example would be the DOM tree that forms a complete page.
Decorator: Adds functionality to classes or objects dynamically.
Adapter: Provides a general interface and work with different adaptees...