Summary
In this chapter, we saw that protocols are treated as full-fledged types by Swift. We also saw how polymorphism can be implemented in Swift with protocols. We concluded this chapter with an in-depth look at protocol extensions and saw how we would use them in Swift.
Protocols and protocol extensions are the backbone of Apple's new protocol-oriented programming paradigm. This new model for programming has the potential to change the way we write and think about code. While we did not specifically cover protocol-oriented programming in this chapter, understanding the topics in this chapter gives us the solid understanding of protocols and protocol extensions needed to learn about this new programming model.
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