Beginning Swift

Master the fundamentals of programming in Swift 4

Rob Kerr, Kåre Morstøl

• Publisher: Packt Publishing
• Year: 2018
• ISBN:
  9781789538649
• Edition: 1
• Topic: Computer Science
• Subtopic: Programming
• Index: Computer Science

Swift greatly simplifies the process of developing applications for Apple devices. This book provides you with the essential skills to help you get started with developing applications using Swift.

Key Features

• Teaches you how to correctly structure and architect software using Swift
• Uses real-world examples to connect the theory to a professional setting
• Imparts expertise in the core Swift standard library

Book Description

Take your first foray into programming for Apple devices with Swift.Swift is fundamentally different from Objective-C, as it is a protocol-oriented language. While you can still write normal object-oriented code in Swift, it requires a new way of thinking to take advantage of its powerful features and a solid understanding of the basics to become productive.

What you will learn

• Explore the fundamental Swift programming concepts, language structure, and the Swift programming syntax
• Learn how Swift compares to other computer languages and how to transform your thinking to leverage new concepts such as optionals and protocols
• Master how to use key language elements, such as strings and collections
• Grasp how Swift supports modern application development using advanced features, such as built-in Unicode support and higher-order functions

Who this book is for

If you are seeking fundamental Swift programming skills, in preparation for learning to develop native applications for iOS or macOS, this book is the best for you. You don't need to have any prior Swift knowledge; however, object-oriented programming experience is desired.

Beginning Swift

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Table of Contents

Beginning Swift

Why Subscribe?

PacktPub.com

Contributors

About the Authors

Packt is Searching for Authors Like You

Preface

What This Book Covers

What You Need for This Book

Who This Book is for

Conventions

Reader Feedback

Customer Support

Downloading the Example Code

Errata

Piracy

Questions

1. Swift Basics

Lesson objectives

Swift Program Structure

Hello, World!

Swift Variables and Constants

Declaring Swift Variables

Variables Versus Constants

Type Inference

Variable Naming

Working with Variables

Tuples

Creating a Tuple

Optionals

Declaring an Optional

Working with Optionals

Optional nil Values

Accessing Optional Values

Force Unwrapping an Optional

Conditionally Unwrapping Optionals

Using Optionals

The Swift guard Statement

Activity: Variable Summary

Swift Data Types

Numeric Data Types

Int on 64-Bit Versus 32-Bit Platforms

Built-In Numeric Data Types

Choosing the Appropriate Numeric Data Type

Declaring and Assigning Integer Variables

Declaring and Assigning Floating Point Numbers

Numeric Literal Grouping

Numeric Type Conversions

Using Numeric Types

Boolean

Character

Assigning a Character

Constructing a Character Literal

String

Instantiating a String

String Concatenation

Extracting Characters

String Length

Activity: Data Type Summary

Enums

Basic Enum Syntax

Enum with Raw Values

Activity: Using Swift Enums

Summary

2. Swift Operators and Control Flow

Lesson objectives

Swift Operators

Assignment Operator

Arithmetic Operators

Standard Arithmetic Operators

Remainder Operator

Unary minus Operator

Compound Assignment Operators

Comparison Operators

Equality

Inequality

Comparison between Two Values

Ternary Conditional Operator

Logical Operators

Bitwise Operators

Nil-Coalescing Operator

Range Operators

Closed Range Operator

Half-Open Range Operator

One-Sided Range Operator

Activity: Operators

Branching

The if Statement

Condition Lists

Optional Unwrapping with if

The switch Statement

switch Statement Rules

The break Keyword

The fallthrough Keyword

Matching Non-Scalar Values

Multiple Patterns in a Single Case

Using the where Statement within case

Evaluating Optionals with a switch Statement

Activity: Converting Code from if to switch

Loops

The for…in Statement

Iterating over Objects

Iterating over Array Objects with index

The for Loop where Clause

The break Control Transfer Statement

The continue Control Transfer Statement

The while Loop

The repeat…while Loop

Activity: Implementing Loops

Summary

3. Functions, Classes, and Structs

Lesson Objectives

Functions

Defining a Function

Argument Labels

Excluding Argument Labels

Parameter Default Values

Activity: Implementing a Function

Returning Values from Functions

Using @discardableResult

Function Attributes

Variadic Parameters

inout Parameters

Recursion

Functions as Parameters

Closures

Creating a Function to Receive Content from an Asynchronous Web Service Call

Error Handling

The do…catch Statement

Multiple catch Blocks

Using do without catch

The guard Statement

Activity: Exception Handling

Object-Oriented Features

Object-Oriented Principles

Classes Versus Structs

Illustration

Defining Classes and Structures

Activity: Creating a Customer Struct and Class

Summary

Challenge

4. Collections

Lesson Objectives

Arrays

Working with Arrays

Index

Common Operations with Index

ArraySlice

Creating Slices

Activity: Working with Arrays

Sets

Working with Sets

Combining Sets

Comparing Sets

Activity: Removing Duplicates from a Sequence

Dictionaries

Working with Dictionaries

Activity: Using Dictionaries

Summary

5. Strings

Lesson Objectives

String Fundamentals

Character

Collection

Index

Working with String Index

Debugging

Activity: All Indices of a Character

Using Strings

Creating Strings

Common Operations

Activity: All Ranges of a Substring

Activity: Counting Words, Sentences, and Paragraphs

Substring

Creating Substrings

Parsing Strings

Converting NSRange to Range

Activity: CamelCase

Summary

6. Functional Programming and Lazy Operations

Lesson Objectives

Function Type

Functional Methods

filter

Using the filter Method

map

Using the map Method

flatMap

Using the flatMap Method

reduce

Using the reduce Function

Activity: Using Functional Programming

Lazy Operations

Lazy Sequences

Sequence Internals

Creating Lazy Operations

sequence(first:next:)

sequence(state:next:)

Activity: Implementing a Lazy Version of a Method

Swifty Code

Naming

Organizing Code

Miscellaneous

Writing Swifty Code

Summary

Further Study

Challenge

Index

Beginning Swift

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