To get the most out of this book

To follow along with the examples in this book, you will need a computer running macOS Catalina (specifically version 10.15.4) or greater. You also need an Apple ID to download and install Xcode 12 from the Mac App Store. The chapter on server-side Swift (Chapter 8, Server-Side Swift) also requires a system running Ubuntu 20.04 LTS.

The code in this book has been tested against Swift 5.3, but should work with any newer versions of Swift.

Software/hardware covered in the book	OS requirements
macOS	10.15.4+ (Catalina)
Xcode	12+
Ubuntu (for Chapter 8, Server-Side Swift)	20.04 LTS

If you are using the digital version of this book, we advise you to type the code yourself or access the code via the GitHub repository (link available in the next section). Doing so will help you avoid any potential errors related to the copying and pasting of code.

Download the example code files

You can download the example code files for this book from GitHub at https://github.com/PacktPublishing/Swift-Cookbook-Second-Edition. In case there's an update to the code, it will be updated on the existing GitHub repository.

We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

Code in Action

Code in Action videos for this book can be viewed at http://bit.ly/3shdTeQ.

Download the color images

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it here: https://static.packt-cdn.com/downloads/9781839211195_ColorImages.pdf.

Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "We can substitute Grumble wherever we would use [Pug] or Array<Pug>."

A block of code is set as follows:

let fraction = rating / total 
let ratingOutOf5 = fraction * 5 
let roundedRating = round(ratingOutOf5) // Rounds to the nearest 
  // integer.

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

class ProgrammeFetcher { 
     
    typealias FetchResultHandler = (String?, Error?) -> Void 
     
    func fetchCurrentProgrammeName(forChannel channel: Channel, 
                                   resultHandler: FetchResultHandler) { 
        // Get next programme 
        let programmeName = "Sherlock" 
        resultHandler(programmeName, nil) 
    } 

Any command-line input or output is written as follows:

$ mkdir css
$ cd css

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Select System info from the Administration panel."

Warnings or important notes appear like this.

Tips and tricks appear like this.