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

Custom initializers


Initializers are called when we initialize a new instance of a particular type (a class or structure). Initialization is the process of preparing an instance for use. The initialization process can include setting initial values for stored properties, verifying external resources are available, or setting up the UI properly. Initializers are generally used to ensure that the instance of the class or structure is properly initialized prior to first use.

Initializers are special methods that are used to create a new instance of a type. We define an initializer exactly as we would define other methods, but we must use the init keyword as the name of the initializer to tell the compiler that this method is an initializer. In its simplest form, the initializer does not accept any arguments. Let's look at the syntax used to write a simple initializer:

init() { 
  //Perform initialization here 
} 

This format works for both classes and structures. By default, all...