With protocol-oriented programming, we should always begin our design with the protocols, but how should we design these protocols? In the object-oriented programming world, we have superclasses that contain all the base requirements for the subclasses. Protocol design is a little bit different.
In the protocol-oriented programming world, we use protocols instead of superclasses, and it is preferable to break the requirements into smaller, more specific protocols rather than having bigger monolithic protocols. In this section, we will look at how we can separate the requirements into smaller, very specific protocols and how to use protocol inheritance and composition. In Chapter 3, Extensions, we will take this a ...
