Summary

In this chapter, we have learned how structural design patterns can help us to create more flexible code that can adapt to changes with ease, sometimes even at runtime. We've covered how we can add functionality to an existing class with the Decorator design pattern, and we've explored how operator overloading can allow us to provide more intuitive syntax to common operations.

We then learned how to adapt one interface to another interface using extension methods, and we also learned how to create anonymous objects to implement an interface only once. Next, we discussed how to simplify class hierarchies using the Bridge design pattern. You should now know how to create a shortcut for a type name with typealias and also how to define efficient constants with const.

Moving on, we looked at the Composite design pattern, and we considered how it could help you to design a system that needs to treat groups of objects and regular objects in the same way. We also learned...