You have to know what is a computer and have basic knowledge of how to use a Mac. You have to be curious about how things work. We will start from the basics of the Swift programming language and Xcode. Most of the book is related to iOS, and it would be nice to have an iOS device to see your mobile applications working on a real device.

You need enough time and patience to go through the book and to experiment with the code, which can be found on GitHub.

You can download the example code files for this book from your account at www.packtpub.com. If you purchased this book elsewhere, you can visit www.packtpub.com/support and register to have the files emailed directly to you.

You can download the code files by following these steps:

1. Log in or register at www.packtpub.com.
2. Select the SUPPORT tab.
3. Click on Code Downloads & Errata.
4. Enter the name of the book in the Search box and follow the onscreen instructions.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

• WinRAR/7-Zip for Windows
• Zipeg/iZip/UnRarX for Mac
• 7-Zip/PeaZip for Linux

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/Learn-Swift-by-Building-Applications. 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!

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it from http://www.packtpub.com/sites/default/files/downloads/LearnSwiftbyBuildingApplications_ColorImages.pdf.

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: "This code creates a place in the memory, called text, where we store the text, Hello world!."

A block of code is set as follows:

func generateGreeting(greet:String, thing:String = "world") -> String {
    return greet + thing + "!"
}
print(generateGreeting(greet: "Hello "))
print(generateGreeting(greet: "Hello ", thing: " Swift 4"))

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

let number = 5
let divisor = 3
let remainder = number % divisor //remainder is again integer
let quotient = number / divisor // quotient is again integer

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

swift package init --type library

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: "Also, add an action to the Sign In With Email button."