In this chapter, you learned how to recognize real-world elements and translate them into the different components of the object-oriented paradigm supported in Swift 3: classes, protocols, properties, methods, and instances. You understood that the classes represent blueprints or templates to generate the objects, also known as instances.

We designed a few classes with properties and methods that represent blueprints for real-life objects. Then, we improved the initial design by taking advantage of the power of abstraction and specialized different classes. We generated many versions of the initial UML diagram as we added superclasses and subclasses. Finally, we wrote some code in the Swift Playground to understand how we can interact with API objects. We recognized many differences between Swift 3 and the previous versions of the programming language when interacting with APIs.

Now that you have learned some of the basics of the object-oriented paradigm, we are ready to start creating classes and instances in Swift 3, which is the topic of the next chapter.