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Learning Swift Second Edition

Learning Swift Second Edition

By : Andrew J Wagner
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Learning Swift Second Edition

Learning Swift Second Edition

5 (1)
By: Andrew J Wagner

Overview of this book

Swift is Apple’s new programming language and the future of iOS and OS X app development. It is a high-performance language that feels like a modern scripting language. On the surface, Swift is easy to jump into, but it has complex underpinnings that are critical to becoming proficient at turning an idea into reality. This book is an approachable, step-by-step introduction into programming with Swift for everyone. It begins by giving you an overview of the key features through practical examples and progresses to more advanced topics that help differentiate the proficient developers from the mediocre ones. It covers important concepts such as Variables, Optionals, Closures, Generics, and Memory Management. Mixed in with those concepts, it also helps you learn the art of programming such as maintainability, useful design patterns, and resources to further your knowledge. This all culminates in writing a basic iOS app that will get you well on your way to turning your own app ideas into reality.
Table of Contents (14 chapters)
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13
Index

Chapter 6. Make Swift Work For You – Protocols and Generics

As we learned in Chapter 2, Building Blocks – Variables, Collections, and Flow Control, Swift is a strongly typed language, which means that every piece of data must have a type. Not only can we take advantage of this to reduce the clutter in our code, we can also leverage it to let the compiler catch bugs for us. The earlier we catch a bug, the better. Besides not writing them in the first place, the earliest place where we can catch a bug is when the compiler reports an error.

Two big tools that Swift provides to achieve this are called protocols and generics. Both of them use the type system to make our intentions clear to the compiler so that it can catch more bugs for us.

In this chapter, we will cover the following topics:

  • Protocols
  • Generics
  • Extending existing generics
  • Extending protocols
  • Putting protocols and generics to use

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