Book Image

Mastering Swift 3 - Linux

By : Jon Hoffman
Book Image

Mastering Swift 3 - Linux

By: Jon Hoffman

Overview of this book

Swift is a modern, fast, and safe programming language created by Apple. Writing Swift is interactive and fun, the syntax is concise yet expressive, and the code runs lightning-fast. Swift’s move to open source has been embraced with open arms and has seen increased adoption in the Linux platform. Our book will introduce you to the Swift language, further delving into all the key concepts you need to create applications for desktop, server, and embedded Linux platforms. We will teach you the best practices to design an application with Swift 3 via design patterns and Protocol-Oriented Programming. Further on, you will learn how to catch and respond to errors within your application. When you have gained a strong knowledge of using Swift in Linux, we’ll show you how to build IoT and robotic projects using Swift on single board computers. By the end of the book, you will have a solid understanding of the Swift Language with Linux and will be able to create your own applications with ease.
Table of Contents (24 chapters)
Mastering Swift 3 - Linux
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
2
Learning About Variables, Constants, Strings, and Operators

Protocol extensions


Protocol extensions allow us to extend a protocol to provide method and property implementations to conforming types. They also allow us to provide common implementations to all confirming types, eliminating the need to provide an implementation in each individual type or the need to create a class hierarchy. While protocol extensions may not seem too exciting, once you see how powerful they really are, they will transform the way you think about and write code.

Let's begin by looking at how we would use protocol extensions with a very simplistic example. We will start off by defining a protocol called DogProtocol as follows:

protocol DogProtocol { 
    var name: String {get set} 
    var color: String {get set} 
} 

With this protocol, we are saying that any type that conforms to the DogProtocol protocol, must have the two properties of the String type, with names of: name and color. Now let's define the three types that conform to this protocol. We will name these types...