How to use this book

Each chapter of this book presents some theory on the topic at hand, along with plenty of Swift code to demonstrate the practical applications of what you're learning.

Since this is a book for beginners, we suggest reading it in order the first time. After that, the book will make a great reference for you to return to and refresh your memory on particular topics.

All the code in this book is platform-neutral; that means it isn't specific to iOS, macOS or any other platform. The code runs in playgrounds, which you'll learn about in the very first chapter.

As you read through the book, you can follow along and type the code into your own playground. That means you'll be able to play with the code by making changes and see the results immediately.

You'll find mini-exercises throughout the book, which are short exercises about the topic at hand. There are also challenges at the end of each chapter, which are either programming questions or longer coding exercises to test your knowledge.

You'll get the most out of this book if you follow along with these exercises and challenges.