Book Image

Mastering Swift 5.3 - Sixth Edition

By : Jon Hoffman
Book Image

Mastering Swift 5.3 - Sixth Edition

By: Jon Hoffman

Overview of this book

Over the years, Mastering Swift has proven itself among developers as a popular choice for an in-depth and practical guide to the Swift programming language. This sixth edition comes with the latest features, an overall revision to align with Swift 5.3, and two new chapters on building swift from source and advanced operators. From the basics of the language to popular features such as concurrency, generics, and memory management, this in-depth guide will help you develop your expertise and mastery of the language. As you progress, you will gain practical insights into some of the most sophisticated elements in Swift development, including protocol extensions, error handling, and closures. The book will also show you how to use and apply them in your own projects. In later chapters, you will understand how to use the power of protocol-oriented programming to write flexible and easier-to-manage code in Swift. Finally, you will learn how to add the copy-on-write feature to your custom value types, along with understanding how to avoid memory management issues caused by strong reference cycles. By the end of this Swift book, you will have mastered the Swift 5.3 language and developed the skills you need to effectively use its features to build robust applications.
Table of Contents (23 chapters)
21
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22
Index

Implementing the Equatable protocol

In this section, we will demonstrate how we can conform to the Equatable protocol using extensions. When a type conforms to the Equatable protocol, we can use the equal-to (==) operator to compare for equality and the not-equal-to (!=) operator to compare for inequality.

If you will be comparing instances of a custom type, then it is a good idea to have that type conform to the Equatable protocol because it makes comparing instances very easy.

Let's start off by creating the type that we will compare. We will name this type Place:

struct Place {
    let id: String
    let latitude: Double 
    let longitude: Double
}

In the Place type, we have three properties that represent the ID of the place and the latitude and longitude coordinates for its location. If there are two instances of the Place type that have the same ID and coordinates, then they will be considered the same place.

To implement the Equatable...