In this chapter, we talked about some advanced features of Swift-like type casting and type checking. We talked about protocols and saw how Swift added some awesome new features to it than Objective-C. We also talked about extensions to add more usable and powerful functionality to any existing classes, structures, and enumerations. We introduced the operator overloading feature and generics to write more usable code. Finally, we talked about memory management to make your app more efficient and more responsive. We ended the chapter with how to use Swift and Objective-C together in the same project and listed the limitations of using some Swift features that can't be used in Objective-C.

Starting with the next chapter, we will mention a new technology in each chapter and how to write a simple demo in Swift. In the next chapter, we will talk about Touch ID, a new framework used to add a new flavor of authentication via finger print sensors.