In this chapter, we covered object-oriented programming principles and paradigms. Then we discussed protocol-oriented programming. Next, we introduced FRP. Finally, we explored how to mix FP with OOP paradigms.

In the following chapter, we will develop a Todo backend and an iOS application employing the concepts that we have covered so far.

We will use functional programming techniques to parse and map the data, and we will use FRP to reactively manage the events in the applications. Additionally, we will employ protocol-oriented programming and object-oriented programming techniques.