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  • Book Overview & Buying Mastering Swift 3 - Linux
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Mastering Swift 3 - Linux

Mastering Swift 3 - Linux

By : Jon Hoffman
4.5 (2)
Buy this Book
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Mastering Swift 3 - Linux

Mastering Swift 3 - Linux

4.5 (2)
By: Jon Hoffman
Buy this Book

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.
Table of Contents (19 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
Lock Free Chapter
1
1. Taking the First Steps with Swift
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1. Taking the First Steps with Swift
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What is Swift?
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Hello World
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Executing Swift code
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Swift and the Swift REPL
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Swift compiler
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Using the Swift Package Manger
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Editors for Swift
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Summary
2
2. Learning About Variables, Constants, Strings, and Operators
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2. Learning About Variables, Constants, Strings, and Operators
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Constants and variables
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Operators
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Summary
3
3. Using Swift Collections and the Tuple Type
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3. Using Swift Collections and the Tuple Type
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Swift collection types
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Mutability
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Arrays
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Dictionaries
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Set
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Tuples
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Summary
4
4. Control Flow and Functions
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4. Control Flow and Functions
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What we have learned so far
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Control flow
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Functions
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Putting it all together
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Summary
5
5. Classes and Structures
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5. Classes and Structures
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What are classes and structures?
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Creating a class or structure
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Custom initializers
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Inheritance
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Overriding methods and properties
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Protocols
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Protocol syntax
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Extensions
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Memory management
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Summary
6
6. Using Protocols and Protocol Extensions
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6. Using Protocols and Protocol Extensions
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Protocols as types
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Polymorphism with protocols
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Type casting with protocols
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Protocol extensions
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Summary
7
7. Protocol-Oriented Design
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7. Protocol-Oriented Design
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Requirements
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Object-oriented design
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Protocol-oriented design
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Summary
8
8. Writing Safer Code with Error Handling
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8. Writing Safer Code with Error Handling
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Error handling prior to Swift 2.0
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Native error handling
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Summary
9
9. Custom Subscripting
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9. Custom Subscripting
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Introducing subscripts
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Subscripts with Swift arrays
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Read and write custom subscripts
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Read-only custom subscripts
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Calculated subscripts
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Subscript values
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External names for subscripts
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Multidimensional subscripts
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When not to use a custom subscript
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Summary
10
10. Using Optional Types
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10. Using Optional Types
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Introducing optionals
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The need for optional types in Swift
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Optional chaining
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Summary
11
11. Working with Generics
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11. Working with Generics
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An introduction to generics
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Generic functions
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Generic types
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Associated types
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Summary
12
12. Working with Closures
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12. Working with Closures
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An introduction to closures
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Simple closures
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Shorthand syntax for closures
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Using closures with Swift's array algorithms
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Changing functionality
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Selecting a closure based on results
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Creating strong reference cycles with closures
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Summary
13
13. Using C Libraries with Swift
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13. Using C Libraries with Swift
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Modules
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Creating a custom module
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Creating the Cpcap module
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Using the Cpcap module
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Linux man pages
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Summary
14
14. Concurrency and Parallelism in Swift
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14. Concurrency and Parallelism in Swift
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Concurrency and parallelism
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Summary
15
15. Swifts Core Libraries
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15. Swifts Core Libraries
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Apple's URL loading system
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Formatter
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Summary
16
16. Swift on Single Board Computers
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16. Swift on Single Board Computers
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The BeagleBone Black
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BeagleBone Black's expansion headers
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Installing Swift
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SwiftyBones3
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Sources directory
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SwiftyBuild
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Blinking an LED with the SBDigitalGPIO type
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TMP36 temperature sensor with the SBAnalog type
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Autonomous robot
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Summary
17
17. Swift Formatting and Style Guide
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17. Swift Formatting and Style Guide
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What is a programming style guide?
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Your style guide
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Summary
18
18. Adopting Design Patterns in Swift
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18. Adopting Design Patterns in Swift
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What are design patterns?
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Creational patterns
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Structural design patterns
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Behavioral design patterns
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Summary

Read and write custom subscripts

Let's see how to define a subscript that is used to read and write to a backend array. Reading and writing to a backend storage class is one of the most common uses for custom subscripts but, as we will see in this chapter, we do not need to have a backend storage class. The following code shows how to use a subscript to read and write to an array:

class MyNames { 
    private var names:[String] = ["Jon", "Kim", "Kailey", "Kara"] 
    subscript(index: Int) -> String { 
        get { 
            return names[index] 
        } 
        set { 
            names[index] = newValue 
        } 
    } 
}

As we can see, the syntax is similar to how we can define properties within a class using the get and set keywords. The difference is that we declare the subscript using the subscript keyword. We then specify one or more inputs and the return type.

We can now use the custom subscript, just like we used subscripts...

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Programming languages
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