To get the most out of this book

This book uses Xcode version 10 and Swift 4.2. If you use a different version of Xcode, you will likely encounter syntax difference. To upgrade the Swift syntax and update the code examples of this book to a newer version of Xcode, you can use Xcode's Edit | Convert | To Current Swift Syntax option.

Visit https://developer.apple.com/xcode/ to download Xcode.