8. Writing Safer Code with Error Handling | Mastering Swift 3 - Linux

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Mastering Swift 3 - Linux

By : Jon Hoffman

4.5 (2)

Mastering Swift 3 - Linux

4.5 (2)

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.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Taking the First Steps with Swift

1. 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

2. Learning About Variables, Constants, Strings, and Operators

Constants and variables

Operators

Summary

3. Using Swift Collections and the Tuple Type

3. Using Swift Collections and the Tuple Type

Swift collection types

Mutability

Arrays

Dictionaries

Set

Tuples

Summary

4. Control Flow and Functions

4. Control Flow and Functions

What we have learned so far

Control flow

Functions

Putting it all together

Summary

5. Classes and Structures

5. 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

6. Using Protocols and Protocol Extensions

Protocols as types

Polymorphism with protocols

Type casting with protocols

Protocol extensions

Summary

7. Protocol-Oriented Design

7. Protocol-Oriented Design

Requirements

Object-oriented design

Protocol-oriented design

Summary

8. Writing Safer Code with Error Handling

8. Writing Safer Code with Error Handling

Error handling prior to Swift 2.0

Native error handling

Summary

9. Custom Subscripting

9. 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

10. Using Optional Types

Introducing optionals

The need for optional types in Swift

Optional chaining

Summary

11. Working with Generics

11. Working with Generics

An introduction to generics

Generic functions

Generic types

Associated types

Summary

12. Working with Closures

12. 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

13. 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

14. Concurrency and Parallelism in Swift

Concurrency and parallelism

Summary

15. Swifts Core Libraries

15. Swifts Core Libraries

Apple's URL loading system

Formatter

Summary

16. Swift on Single Board Computers

16. 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

17. Swift Formatting and Style Guide

What is a programming style guide?

Your style guide

Summary

18. Adopting Design Patterns in Swift

18. Adopting Design Patterns in Swift

What are design patterns?

Creational patterns

Structural design patterns

Behavioral design patterns

Summary

Native error handling

Languages such as Java and C# generally refer to the error handling process as exception handling; within the Swift documentation, Apple refers to this process as error handling. While, externally, Java and C# exception handling may look very similar to Swift's error handling, there are some significant differences that those familiar with exception handling in the other languages will notice throughout this chapter.

Representing errors

Before we can really understand how error handling works in Swift, we must first see how we would represent an error. In Swift, errors are represented by values of types that conform to the Error protocol. Swift's enumerations are very well suited to modeling error conditions because, generally, we have a finite number of error conditions to represent.

Let's look at how we would use an enumeration to represent an error. For this, we will define a fictitious error named MyError with three error conditions: Minor, Bad, and Terrible:

enum MyError...

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