When Apple announced Swift 2 at the World Wide Developers Conference (WWDC) in 2016, they also declared that Swift was the world's first Protocol-Oriented Programming (POP) language. By its name we might assume that POP is all about the protocol; however that would be a wrong assumption. POP is about so much more than just the protocol; it is actually a new way of not only writing applications but also thinking about programming.
In this chapter we will learn:
The difference between OOP and POP design
What is protocol-oriented design?
What is protocol composition?
What is protocol inheritance?
Within days after Dave Abrahams did his presentation on POP at the WWDC 2016, there were numerous tutorials on the Internet about POP that took a very object-oriented approach to it. By this statement I mean the approach taken by these tutorials focused on replacing the superclass with protocols and protocol extensions. While protocols and protocol extensions are arguably...