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Home > Programming > Application Development > Mastering Swift 5
Mastering Swift 5
Mastering Swift 5

Mastering Swift 5: Deep dive into the latest edition of the Swift programming language , Fifth Edition

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Mastering Swift 5

Learning about Variables, Constants, Strings, and Operators

The first program I ever wrote was written in the BASIC programming language and was the typical Hello World application. This application was exciting at first, but the excitement of printing static text wore off pretty quickly. For my second application, I used BASIC's input command to ask the user for a name and then printed out a custom hello message with the name they entered. At the age of 12, it was pretty cool to display Hello Han Solo. This application led me to create numerous Mad Lib-style applications that prompted the user for various words and then put those words into a story that was displayed after the user had entered all the required words. These applications introduced me to, and taught me, the importance of variables. Every useful application I've created since then has used variables.

In...

Constants and variables

Constants and variables associate an identifier (such as myName or currentTemperature) with a value of a particular type (such as the String or Integer type), where the identifier can be used to retrieve the value. The difference between a constant and a variable is that a variable can be updated or changed, while a constant cannot be changed once a value is assigned to it.

Constants are good for defining values that you know will never change, like the temperature that water freezes at or the speed of light. Constants are also good for defining a value that we use many times throughout our application, such as a standard font size or the maximum number of characters in a buffer. There will be numerous examples of constants throughout this book, and it is recommended that we use constants rather than variables whenever possible.

Variables tend to be more...

Numeric types

Swift contains many of the standard numeric types that are suitable for storing various integer and floating-point values. Let's start off by looking at the integer type.

Integer types

An integer is a whole number and can be either signed (positive, negative, or zero) or unsigned (positive or zero). Swift provides several integer types of different sizes. The following chart shows the value ranges for the different integer types on a 64-bit system:

...

Type

Minimum

Maximum

Int8

-128

127

Int16

-32,768

32,767

Int32

-2,147,483,648

2,147,483,647

Int64

- 9,223,372,036,854,775,808

9,223,372,036,854,775,807

Int

- 9,223,372,036,854,775,808

9,223,372,036,854,775,807

The Boolean type

Boolean values are often referred to as logical values because they can be either true or false. Swift has a built-in Boolean type that accepts one of the two built-in Boolean constants: true and false.

Boolean constants and variables can be defined like this:

let swiftIsCool = true  
var itIsRaining = false

Boolean values are especially useful when working with conditional statements, such as the if, while, and guard statements. For example, what do you think this code would do?

let isSwiftCool = true  
let isItRaining = false  
if isSwiftCool { 
print("YEA, I cannot wait to learn it") 
} 
if isItRaining {  
print("Get a rain coat") 
}

If you answered that this code would print out YEA, I cannot wait to learn it, then you would be correct. This line is printed out because the isSwiftCool Boolean type is set to true. As the isItRaining variable...

The String type

A string is an ordered collection of characters, such as Hello or Swift, and is represented by the String type. We have seen several examples of strings in this book, and therefore the following code should look familiar. This code shows how to define two strings:

var stringOne = "Hello"  
var stringTwo = " World"

We can also create a string using a multiline string literal. The following code shows how we can do that:

var multiLine = """ 
This is a multiline string literal.  
This shows how we can create a string over multiple lines. 
"""

Notice that we put three double quotes around the multiline string. We can use quotes in our multiline string to quote specific text. The following code shows how to do this:

var multiLine = """ 
This is a multiline string literal.  
This shows how we can create...

Tuples

Tuples group multiple values into a single compound type. These values are not required to be of the same type.

The following example shows how to define a tuple:

var team = ("Boston", "Red Sox", 97, 65, 59.9)

In the preceding example, an unnamed tuple was created that contains two strings, two integers, and one double. The values of the tuple can be decomposed into a set of variables, as shown in the following example:

var team = ("Boston", "Red Sox", 97, 65, 59.9)  
var (city, name, wins, losses, percent) = team

In the preceding code, the city variable will contain Boston, the name variable will contain Red Sox, the wins variable will contain 97, the losses variable will contain 65, and finally the percent variable will contain 59.9.

The values of the tuple can also be retrieved by specifying the location of the value. The following...

Enumerations

Enumerations (also known as enums) are a special data type that enables us to group related types together and use them in a type-safe manner. Enumerations in Swift are not tied to integer values as they are in other languages, such as C or Java. In Swift, we are able to define an enumeration with a type (string, character, integer, or floating-point) and then define its actual value (known as the raw value). Enumerations also support features that are traditionally only supported by classes, such as computed properties and instance methods. We will discuss these advanced features in depth in Chapter 7, Classes, Structures, and Protocols. In this section, we will look at the traditional features of enumerations.

We will define an enumeration that contains a list of Planets, like this:

enum Planets {  
  case mercury  
  case venus  
  case earth  
  case mars  
 ...

Operators

An operator is a symbol or combination of symbols that we can use to check, change, or combine values. We have used operators in most of the examples so far in this book, but we did not specifically call them operators. In this section, we will show you how to use most of the basic operators that Swift supports.

Swift supports most standard C operators and also improves on some of them to eliminate several common coding errors. For example, the assignment operator does not return a value, which prevents it from being used where we are meant to use the equality operator, which is two equal signs (==).

Let's look at the operators in Swift.

Assignment operator

The assignment operator initializes or updates a variable...

Summary

In this chapter, we covered topics ranging from variables and constants to data types and operators. The items in this chapter will act as the foundation for every application that you write; therefore, it is important to understand the concepts we discussed here.

In this chapter, we have seen that we should prefer constants to variables when the value is not going to change. Swift will give you a compile time warning if you set but never change a variable's value. We also saw that we should prefer type inference over declaring a type.

Numeric and string types, which are implemented as primitives in other languages, are named types that are implemented with structures in Swift. In future chapters, you will see why this is important. One of the most important things to remember from this chapter is that, if a variable contains a nil value, you must declare it as an...

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Key benefits

  • Fifth edition of this bestselling book, improved and updated to cover the latest version of the Swift 5 programming language
  • Get to grips with popular and modern design techniques to write easy-to-manage Swift code
  • Learn how to use core Swift features such as concurrency, generics, and copy-on-write in your code

Description

Over the years, the Mastering Swift book has established itself amongst developers as a popular choice as an in-depth and practical guide to the Swift programming language. The latest edition is fully updated and revised to cover the new version: Swift 5. Inside this book, you'll find the key features of Swift 5 easily explained with complete sets of examples. From the basics of the language to popular features such as concurrency, generics, and memory management, this definitive guide will help you develop your expertise and mastery of the Swift language. Mastering Swift 5, Fifth Edition will give you an in-depth knowledge of some of the most sophisticated elements in Swift development, including protocol extensions, error handling, and closures. It will guide you on how to use and apply them in your own projects. Later, you'll see how to leverage the power of protocol-oriented programming to write flexible and easier-to-manage code. You will also see how to add the copy-on-write feature to your custom value types and how to avoid memory management issues caused by strong reference cycles.

Who is this book for?

This book is for developers who want to delve into the newest version of Swift. If you are a developer and learn best by looking at and working with code, then this book is for you. A basic understanding of Apple's tools would be beneficial but not mandatory. All examples should work on the Linux platform as well.

What you will learn

  • Understand core Swift components, including operators, collections, control flows, and functions
  • Learn how and when to use classes, structures, and enumerations
  • Understand how to use protocol-oriented design with extensions to write easier-to-manage code
  • Use design patterns with Swift, to solve commonly occurring design problems
  • Implement copy-on-write for you custom value types to improve performance
  • Add concurrency to your applications using Grand Central Dispatch and Operation Queues
  • Implement generics to write flexible and reusable code
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Length: 370 pages
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ISBN-13 : 9781789139860
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Category :
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Languages :
Swift
Concepts :
Application Development
Tools :
iOS

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Table of Contents

19 Chapters
Taking the First Steps with Swift Chevron down icon Chevron up icon
Taking the First Steps with Swift
What is Swift?
Swift features
Playgrounds
Swift language syntax
Hello World
Summary
Learning about Variables, Constants, Strings, and Operators Chevron down icon Chevron up icon
Learning about Variables, Constants, Strings, and Operators
Constants and variables
Numeric types
The Boolean type
The String type
Tuples
Enumerations
Operators
Summary
Optional Types Chevron down icon Chevron up icon
Optional Types
Introducing optionals
The need for optional types in Swift
Defining an optional
Using optionals
Summary
Using Swift Collections Chevron down icon Chevron up icon
Using Swift Collections
Swift collection types
Arrays
Dictionaries
Set
Summary
Control Flow Chevron down icon Chevron up icon
Control Flow
What have we learned so far?
Curly brackets
Parentheses
Control flow
Conditional statements
Using case and where statements with conditional statements
Control transfer statements
Summary
Functions Chevron down icon Chevron up icon
Functions
Using a single parameter function
Using a multi-parameter function
Defining a parameter's default values
Returning multiple values from a function
Adding external parameter names
Using variadic parameters
Inout parameters
Omitting argument labels
Putting it all together
Summary
Classes, Structures, and Protocols Chevron down icon Chevron up icon
Classes, Structures, and Protocols
What are classes and structures?
Value versus reference types
Creating a class or structure
Properties
Methods
Access controls
Inheritance
Protocols
Extensions
Optional chaining
Summary
Using Protocols and Protocol Extensions Chevron down icon Chevron up icon
Using Protocols and Protocol Extensions
Protocols as types
Polymorphism with protocols
Type casting with protocols
Protocol extensions
Do I need to use protocols?
Swift's standard library
Summary
Protocol Oriented Design Chevron down icon Chevron up icon
Protocol Oriented Design
Requirements
Object-oriented design
Protocol-oriented design
Structures versus classes
The array structure
Summary
Generics Chevron down icon Chevron up icon
Generics
Introducing generics
Conditionally adding extensions with generics
Conditional conformance
Summary
Availability and Error Handling Chevron down icon Chevron up icon
Availability and Error Handling
Native error handling
The availability attribute
Summary
Custom Subscripting Chevron down icon Chevron up icon
Custom Subscripting
Introducing subscripts
Subscripts with Swift arrays
Dynamic member lookup
Summary
Working with Closures Chevron down icon Chevron up icon
Working with Closures
An introduction to closures
Summary
Concurrency and Parallelism in Swift Chevron down icon Chevron up icon
Concurrency and Parallelism in Swift
Concurrency and parallelism
Grand Central Dispatch
Using the Operation and OperationQueue types
Summary
Custom Types Chevron down icon Chevron up icon
Custom Types
Value types and reference types
Copy-on-write
Implementing the equatable protocol
Summary
Memory Management Chevron down icon Chevron up icon
Memory Management
How ARC works
Strong reference cycles
Summary
Swift Formatting and Style Guider Chevron down icon Chevron up icon
Swift Formatting and Style Guider
What is a programming style guide?
Your style guide
Summary
Adopting Design Patterns in Swift Chevron down icon Chevron up icon
Adopting Design Patterns in Swift
What are design patterns?
Summary
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Rating distribution
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.8
(29 Ratings)
5 star 37.9%
4 star 27.6%
3 star 17.2%
2 star 13.8%
1 star 3.4%
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Amazon Customer Dec 01, 2020
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I am new to Swift but have moderate experience in other languages, this book was very appropriate for my skill level. Hoffman uses meaningful examples that are succinct and effective.
Amazon Verified review Amazon
Agatha Yeung Nov 08, 2020
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is a good introduction for beginners. Also helpful if you know other languages (c#, java, python etc) and want to quickly learn Swift.
Amazon Verified review Amazon
Hobbes Doo Jun 16, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book is a great reference to the Swift 5 language. It's great for beginners with some programming knowledge and experienced developers looking to learn Swift. My only complaint is that there are several errors throughout the book. If they were just typos I wouldn't mind, like "form" instead of "from", but they're code errors that would confuse a beginner and even hinder the understanding of the language. For example, in one chapter it shows a range type with a value 1..<20, meaning, the values go from 1 to 19, but the book says "0 to 19", and so on. Although annoying, this is not enough reason to not give this book and its author 5 stars. I'm really enjoying how well things are explained and with great examples, easy to follow.
Amazon Verified review Amazon
Daniel Kimball Jul 02, 2020
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Im new to swift and this is a great introduction.I’m learning a lot quickly so 5 stars. I wish the book had practice challenges and also there are errors here and there in chapter 7
Amazon Verified review Amazon
Jack N. Hatfield Feb 07, 2022
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Very complete coverage of Swift. Shows the strength and beauty of this new language. Easy to use, safe and new features that no doubt will be incorporated in other languages.
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About the author

Profile icon Jon Hoffman
Jon Hoffman
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Jon has over 28 years of experience in the Engineering and IT fields, including over 15 years spent in leadership and management roles. During this time, he has consistently delivered projects on time and within budget. Jon is recognized for successfully leading cross-functional agile teams, combining technical expertise with a strategic vision to guide projects from start to finish. He attributes much of his success to his ability to build highly productive teams that emphasize collaboration, communication, and a clear sense of purpose. Jon has developed extensively for the iOS platform since 2008. This includes several apps that he has published in the App Store, apps that he has written for third parties, and numerous enterprise applications. He has also developed mobile applications for the Android and Windows platforms. What really drives Jon are the challenges that the field of information technology provides and there is nothing more exhilarating to him than overcoming a challenge. Outside of his professional endeavors, Jon enjoys spending quality time with his kids and partner. Residing in Tallahassee, Florida, he takes full advantage of the outdoor activities available in the area. Paddle boarding, hiking, running, and biking are activities that Jon particularly enjoys, reflecting his passion for an active and adventurous lifestyle.
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Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela