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Swift 4 Protocol-Oriented Programming

You're reading from   Swift 4 Protocol-Oriented Programming Bring predictability, performance, and productivity to your Swift applications

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Product type Paperback
Published in Oct 2017
Publisher Packt
ISBN-13 9781788470032
Length 210 pages
Edition 3rd Edition
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Author (1):
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Jon Hoffman Jon Hoffman
Author Profile Icon Jon Hoffman
Jon Hoffman
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Toc

Table of Contents (15) Chapters Close

Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
1. Starting with the Protocol FREE CHAPTER 2. Our Type Choices 3. Extensions 4. Generics 5. Object-Oriented Programming 6. Protocol-Oriented Programming 7. Adopting Design Patterns in Swift 8. Case Studies

Conforming to the Equatable protocol


In this section, we will show 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.

Note

If you will be comparing instances of a custom type, 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 would be considered the same place.

To implement the Equatable protocol, we could create a global function. However, that...

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