Swift 4 Programming Cookbook

Overview of this book

Swift 4 is an exciting, multi-platform, general-purpose programming language. Being open source, modern and easy to use has made Swift one of the fastest growing programming languages. If you interested in exploring it, then this book is what you need. The book begins with an introduction to the basic building blocks of Swift 4, its syntax and the functionalities of Swift constructs. Then, introduces you to Apple's Xcode 9 IDE and Swift Playgrounds, which provide an ideal platform to write, execute, and debug the codes thus initiating your development process. Next, you'll learn to bundle variables into tuples, set order to your data with an array, store key-value pairs with dictionaries and you'll learn how to use the property observers. Later, explore the decision-making and control structures in Swift and learn how to handle errors in Swift 4. Then you'll, examine the advanced features of Swift, generics and operators, and then explore the functionalities outside of the standard library, provided by frameworks such as Foundation and UIKit. Also, you'll explore advanced features of Swift Playgrounds. At the end of the book, you'll learn server-side programming aspect of Swift 4 and see how to run Swift on Linux and then investigate Vapor, one of the most popular server-side frameworks for Swift.

Preface

What this book covers

What you need for this book

Free Chapter

Swift Building Blocks

Introduction

Your first Swift program

Strings, Ints, Floats, and Bools

Optionals, unwrap, and force unwrap

Structs

Building on the Building Blocks

Introduction

Bundling variables into tuples

Ordering your data with arrays

Containing your data with sets

Storing key-value pairs with Dictionaries

Subscripts for custom types

Changing your name with typealias

Getting property changing notifications using property observers

Controlling access with access control

Extending functionality with extensions

Data Wrangling with Swift Control Flow

Introduction

Making decisions with if/else

Switch it up

For the love of loops

While loops

Try, throw, do and, catch - Swift error handling

Checking up front with guard

Doing it later with defer

Bailing out with fatalError and precondition

Generics, Operators, and Nested Types

Introduction

Using generics with types

Using generics with functions

Using generics with protocols

Advanced operators

Option set

Create custom operators

Nested types

Beyond the Standard Library

Introduction

Foundation

Networking

JSON

XML

Cocoa Touch

Swift Playgrounds

Introduction

Using Swift Playgrounds for UI

Import Resources into Playgrounds

Import Code into Playgrounds

Multi-Page Playgrounds

Server-Side Swift

Introduction

Swift on Ubuntu

Building a REST API using Vapor

Persistence with Vapor using Postgres

Hosting your Vapor app on Heroku

Performance and Responsiveness in Swift

Introduction

Value and reference semantics

Dispatch Queues

Concurrent queues and dispatch groups

Operations

Customer Reviews

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Containing your data with sets

The next collection type we will look at is a set. Sets differ from arrays in two important ways. The elements in a set are stored unordered, and each unique element is only held once. In this recipe, we will look at how we can create and manipulate sets.

How to do it...

Let's take a look at the following steps:

First, let's look at how sets only store unique elements:

let fibonacciArray: Array<Int> = [1, 1, 2, 3, 5, 8, 13, 21, 34] 
let fibonacciSet: Set<Int> = [1, 1, 2, 3, 5, 8, 13, 21, 34] 
print(fibonacciArray.count) // 10 
print(fibonacciSet.count) // 9

Elements can be inserted and removed, and you can check whether a set contains an element using the following:

var...

Swift 4 Programming Cookbook

Swift 4 Programming Cookbook

Overview of this book

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