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Mastering Swift 3 - Linux

Book Description

Learn to build fast and robust applications on the Linux platform with Swift

About This Book

  • Create robust applications by building a strong foundation in the Swift Language
  • Utilize Swift 3 on the embedded Linux platform for IoT and Robotic projects
  • Build more flexible and high-performing applications on desktop, server, and embedded Linux platforms

Who This Book Is For

This book is for Linux developers who are interested in quickly learning how to use Swift to create exciting applications on Linux platforms.

What You Will Learn

  • Install Swift on the Linux platform
  • Explore the power of the Swift language
  • Get to know the proper design techniques
  • Understand Swift’s new Core Library
  • Implement popular design patterns with Swift
  • Integrate C libraries with Swift
  • Using Swift on Single-Board Computers
  • Learn how to add concurrency to your application with Grand Central Dispatch
  • Learn how to work with Swift Generics
  • Learn how to use the Protocol-Oriented design paradigm

In Detail

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.

Style and approach

This easy-to-follow, code-rich guide is filled with examples that demonstrate how to put the concepts into practice. You’ll also get design patterns and best practices to get you writing better applications on the Linux platform.

Downloading the example code for this book. You can download the example code files for all Packt books you have purchased from your account at http://www.PacktPub.com. If you purchased this book elsewhere, you can visit http://www.PacktPub.com/support and register to have the code file.

Table of Contents

  1. Mastering Swift 3 - Linux
    1. Mastering Swift 3 - Linux
    2. Credits
    3. About the Author
    4. About the Reviewers
    5. www.PacktPub.com
      1. Why subscribe?
    6. Preface
      1. What this book covers
      2. What you need for this book
      3. Who this book is for
      4. Conventions
      5. Reader feedback
      6. Customer support
        1. Downloading the example code
        2. Downloading the color images of this book
        3. Errata
        4. Piracy
        5. Questions
    7. 1. Taking the First Steps with Swift
      1. What is Swift?
        1. Swift's features
        2. Installing Swift 3 for Linux
        3. Swift language syntax
        5. Semicolons
        6. Parentheses
        7. Curly brackets
        8. Assignment operators do not return a value
        9. Spaces are optional in conditional and assignment statements
      2. Hello World
      3. Executing Swift code
      4. Swift and the Swift REPL
      5. Swift compiler
      6. Using the Swift Package Manger
      7. Editors for Swift
      8. Summary
    8. 2. Learning About Variables, Constants, Strings, and Operators
      1. Constants and variables
        1. Defining constants and variables
        2. Type safety
        3. Type inference
        4. Explicit types
        5. Numeric types
          1. Integers
          2. Floating point
        6. The Boolean type
        7. The String type
        8. Optional variables
        9. Enumerations
      2. Operators
        1. The assignment operator
        2. Comparison operators
        3. Arithmetic operators
        4. The remainder operator
        5. Compound assignment operators
        6. The ternary conditional operator
        7. The logical NOT operator
        8. The logical AND operator
        9. The logical OR operator
      3. Summary
    9. 3. Using Swift Collections and the Tuple Type
      1. Swift collection types
      2. Mutability
      3. Arrays
        1. Creating and initializing arrays
        2. Accessing the array elements
        3. Counting the elements of an array
        4. Is the array empty?
        5. Appending to an array
        6. Inserting a value into an array
        7. Replacing elements in an array
        8. Removing elements from an array
        9. Adding two arrays
        10. Reversing an array
        11. Retrieving a subarray from an array
        12. Making bulk changes to an array
        13. Algorithms for arrays
          1. Sort
          2. Sorted
          3. Filter
          4. Map
          5. forEach
        14. Iterating over an array
      4. Dictionaries
        1. Creating and initializing dictionaries
        2. Accessing dictionary values
        3. Counting key or values in a dictionary
        4. Is the dictionary empty?
        5. Updating the value of a key
        6. Adding a key-value pair
        7. Removing a key-value pair
      5. Set
        1. Initializing a set
        2. Inserting items into a set
        3. The number of items in a set
        4. Checking whether a set contains an item
        5. Iterating over a set
        6. Removing items in a set
        7. Set operations
      6. Tuples
      7. Summary
    10. 4. Control Flow and Functions
      1. What we have learned so far
        1. Curly brackets
        2. Parentheses
      2. Control flow
        1. Conditional statements
          1. The if statement
          2. Conditional code execution with the if...else statement
        2. The for loop
          1. Using the for...in loop
        3. The while loop
          1. Using the while loop
          2. Using the repeat...while loop
        4. The switch statement
        5. Using case and where statements with conditional statements
          1. Filtering with the where statement
          2. Filtering with the for…case statement
          3. Using the if...case statement
        6. Control transfer statements
          1. The continue statement
          2. The break statement
          3. The fallthrough statement
          4. The guard statement
      3. Functions
        1. Using a single-parameter function
        2. Using a multi-parameter function
        3. Defining a parameter's default values
        4. Returning multiple values from a function
        5. Returning optional values
        6. Adding external parameter names
        7. Using variadic parameters
        8. Inout parameters
        9. Nesting functions
      4. Putting it all together
      5. Summary
    11. 5. Classes and Structures
      1. What are classes and structures?
        1. Similarities between classes and structures
        2. Differences between classes and structures
        3. Value versus reference types
      2. Creating a class or structure
        1. Properties
        2. Stored properties
        3. Computed properties
        4. Property observers
        5. Methods
      3. Custom initializers
        1. Internal and external parameter names
        2. Failable initializers
      4. Inheritance
      5. Overriding methods and properties
        1. Overriding methods
        2. Overriding properties
        3. Preventing overrides
      6. Protocols
      7. Protocol syntax
        1. Property requirements
        2. Method requirements
      8. Extensions
      9. Memory management
        1. How ARC works
        2. Strong reference cycles
      10. Summary
    12. 6. Using Protocols and Protocol Extensions
      1. Protocols as types
      2. Polymorphism with protocols
      3. Type casting with protocols
      4. Protocol extensions
      5. Summary
    13. 7. Protocol-Oriented Design
      1. Requirements
      2. Object-oriented design
      3. Protocol-oriented design
        1. Protocol inheritance
        2. Protocol composition
        3. Animal - protocol-oriented design
        4. Using the where statement with protocols
      4. Summary
    14. 8. Writing Safer Code with Error Handling
      1. Error handling prior to Swift 2.0
      2. Native error handling
        1. Representing errors
        2. Throwing errors
        3. Catching errors
      3. Summary
    15. 9. Custom Subscripting
      1. Introducing subscripts
      2. Subscripts with Swift arrays
      3. Read and write custom subscripts
      4. Read-only custom subscripts
      5. Calculated subscripts
      6. Subscript values
      7. External names for subscripts
      8. Multidimensional subscripts
      9. When not to use a custom subscript
      10. Summary
    16. 10. Using Optional Types
      1. Introducing optionals
      2. The need for optional types in Swift
        1. Defining an optional
        2. Using optionals
          1. Forced unwrapping optionals
          2. Optional binding
          3. Returning optionals from functions, methods, and subscripts
          4. Using optionals as a parameter in a function or method
          5. Optional types with tuples
      3. Optional chaining
        1. The nil coalescing operator
      4. Summary
    17. 11. Working with Generics
      1. An introduction to generics
      2. Generic functions
      3. Generic types
      4. Associated types
      5. Summary
    18. 12. Working with Closures
      1. An introduction to closures
      2. Simple closures
      3. Shorthand syntax for closures
      4. Using closures with Swift's array algorithms
      5. Changing functionality
      6. Selecting a closure based on results
      7. Creating strong reference cycles with closures
      8. Summary
    19. 13. Using C Libraries with Swift
      1. Modules
      2. Creating a custom module
      3. Creating the Cpcap module
      4. Using the Cpcap module
      5. Linux man pages
      6. Summary
    20. 14. Concurrency and Parallelism in Swift
      1. Concurrency and parallelism
        1. GCD
        2. Helper functions
          1. Creating queues
            1. Creating and using a concurrent queue
            2. Creating and using a serial queue
          2. async versus sync
          3. Executing code on the main queue function
          4. Using asyncAfter
      2. Summary
    21. 15. Swifts Core Libraries
      1. Apple's URL loading system
        1. URLSession
        2. URLSessionConfiguration
        3. URLSessionTask
        4. URL
        5. URLRequest
        6. HTTPURLResponse
        7. REST web services
        8. Making an HTTP GET request
        9. Making an HTTP POST request
      2. Formatter
        1. DateFormatter
        2. NumberFormatter
        3. FileManager
      3. Summary
    22. 16. Swift on Single Board Computers
      1. The BeagleBone Black
      2. BeagleBone Black's expansion headers
      3. Installing Swift
      4. SwiftyBones3
      5. Sources directory
      6. SwiftyBuild
      7. Blinking an LED with the SBDigitalGPIO type
      8. TMP36 temperature sensor with the SBAnalog type
      9. Autonomous robot
      10. Summary
    23. 17. Swift Formatting and Style Guide
      1. What is a programming style guide?
      2. Your style guide
        1. Do not use semicolons at the end of statements
        2. Do not use parentheses for conditional statements
        3. Naming
          1. Custom types
          2. Functions and methods
          3. Constants and variables
          4. Indenting
        5. Using the self keyword
        6. Constants and variables
        7. Optional types
          1. Use optional binding
          2. Use optional chaining over optional binding for multiple unwrapping
        8. Use type inference
        9. Use shorthand declaration for collections
        10. Use switch rather than multiple if statements
        11. Don't leave commented-out code in your application
      3. Summary
    24. 18. Adopting Design Patterns in Swift
      1. What are design patterns?
      2. Creational patterns
        1. The singleton design pattern
          1. Understanding the problem
          2. Understanding the solution
          3. Implementing the singleton pattern
        2. The builder design pattern
          1. Understanding the problem
          2. Understanding the solution
          3. Implementing the builder pattern
      3. Structural design patterns
        1. The bridge pattern
          1. Understanding the problem
          2. Understanding the solution
          3. Implementing the bridge pattern
        2. The façade pattern
          1. Understanding the problem
          2. Understanding the solution
          3. Implementing the façade pattern
        3. The proxy design pattern
          1. Understanding the problem
          2. Understanding the solution
          3. Implementing the proxy pattern
      4. Behavioral design patterns
        1. The command design pattern
          1. Understanding the problem
          2. Understanding the solution
          3. Implementing the command pattern
        2. The strategy pattern
          1. Understanding the problem
          2. Understanding the solution
          3. Implementing the strategy pattern
      5. Summary