Book Image

Mastering Swift 3 - Linux

By : Jon Hoffman
Book Image

Mastering Swift 3 - Linux

By: Jon Hoffman

Overview of this book

Swift is a modern, fast, and safe programming language created by Apple. Writing Swift is interactive and fun, the syntax is concise yet expressive, and the code runs lightning-fast. Swift’s move to open source has been embraced with open arms and has seen increased adoption in the Linux platform. Our book will introduce you to the Swift language, further delving into all the key concepts you need to create applications for desktop, server, and embedded Linux platforms. We will teach you the best practices to design an application with Swift 3 via design patterns and Protocol-Oriented Programming. Further on, you will learn how to catch and respond to errors within your application. When you have gained a strong knowledge of using Swift in Linux, we’ll show you how to build IoT and robotic projects using Swift on single board computers. By the end of the book, you will have a solid understanding of the Swift Language with Linux and will be able to create your own applications with ease.

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Table of Contents (24 chapters)
Mastering Swift 3 - Linux
Mastering Swift 3 - Linux
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Taking the First Steps with Swift
Taking the First Steps with Swift
What is Swift?
Hello World
Executing Swift code
Swift and the Swift REPL
Swift compiler
Using the Swift Package Manger
Editors for Swift
Summary
2
Learning About Variables, Constants, Strings, and Operators
Learning About Variables, Constants, Strings, and Operators
Constants and variables
Operators
Summary
3
Using Swift Collections and the Tuple Type
Using Swift Collections and the Tuple Type
Swift collection types
Mutability
Arrays
Dictionaries
Set
Tuples
Summary
4
Control Flow and Functions
Control Flow and Functions
What we have learned so far
Control flow
Functions
Putting it all together
Summary
5
Classes and Structures
Classes and Structures
What are classes and structures?
Creating a class or structure
Custom initializers
Inheritance
Overriding methods and properties
Protocols
Protocol syntax
Extensions
Memory management
Summary
6
Using Protocols and Protocol Extensions
Using Protocols and Protocol Extensions
Protocols as types
Polymorphism with protocols
Type casting with protocols
Protocol extensions
Summary
7
Protocol-Oriented Design
Protocol-Oriented Design
Requirements
Object-oriented design
Protocol-oriented design
Summary
8
Writing Safer Code with Error Handling
Writing Safer Code with Error Handling
Error handling prior to Swift 2.0
Native error handling
Summary
9
Custom Subscripting
Custom Subscripting
Introducing subscripts
Subscripts with Swift arrays
Read and write custom subscripts
Read-only custom subscripts
Calculated subscripts
Subscript values
External names for subscripts
Multidimensional subscripts
When not to use a custom subscript
Summary
10
Using Optional Types
Using Optional Types
Introducing optionals
The need for optional types in Swift
Optional chaining
Summary
11
Working with Generics
Working with Generics
An introduction to generics
Generic functions
Generic types
Associated types
Summary
12
Working with Closures
Working with Closures
An introduction to closures
Simple closures
Shorthand syntax for closures
Using closures with Swift's array algorithms
Changing functionality
Selecting a closure based on results
Creating strong reference cycles with closures
Summary
13
Using C Libraries with Swift
Using C Libraries with Swift
Modules
Creating a custom module
Creating the Cpcap module
Using the Cpcap module
Linux man pages
Summary
14
Concurrency and Parallelism in Swift
Concurrency and Parallelism in Swift
Concurrency and parallelism
Summary
15
Swifts Core Libraries
Swifts Core Libraries
Apple's URL loading system
Formatter
Summary
16
Swift on Single Board Computers
Swift on Single Board Computers
The BeagleBone Black
BeagleBone Black's expansion headers
Installing Swift
SwiftyBones3
Sources directory
SwiftyBuild
Blinking an LED with the SBDigitalGPIO type
TMP36 temperature sensor with the SBAnalog type
Autonomous robot
Summary
17
Swift Formatting and Style Guide
Swift Formatting and Style Guide
What is a programming style guide?
Your style guide
Summary
18
Adopting Design Patterns in Swift
Adopting Design Patterns in Swift
What are design patterns?
Creational patterns
Structural design patterns
Behavioral design patterns
Summary

Chapter 10. Using Optional Types

When I first started using Swift, the concept that I had the most trouble learning was optional types. Coming from an Objective-C, C, Java, and Python background, I was able to relate most of Swift's features to how things worked in one of the other languages that I knew, but optionals were different. There really was nothing like optionals in the other languages that I used, so it took a lot of reading to fully understand them. While we covered optionals in Chapter 2, Learning About Variables, Constants, Strings, and Operators, which gave a brief overview of what optionals are, we really need to cover them in more detail to fully understand what optionals are, how to properly use them, and why they are so important in the Swift language.

In this chapter, we will cover the following topics:

  • An introduction to optional types

  • The need for optional types in Swift

  • Unwrapping an optional

  • Optional binding

  • Optional chaining

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