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Swift Functional Programming

You're reading from   Swift Functional Programming Ease the creation, testing, and maintenance of Swift codes

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Product type Paperback
Published in Apr 2017
Publisher Packt
ISBN-13 9781787284500
Length 316 pages
Edition 2nd Edition
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Author (1):
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Dr. Fatih Nayebi Dr. Fatih Nayebi
Author Profile Icon Dr. Fatih Nayebi
Dr. Fatih Nayebi
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Table of Contents (12) Chapters Close

Preface 1. Getting Started with Functional Programming in Swift FREE CHAPTER 2. Functions and Closures 3. Types and Type Casting 4. Enumerations and Pattern Matching 5. Generics and Associated Type Protocols 6. Map, Filter, and Reduce 7. Dealing with Optionals 8. Functional Data Structures 9. Importance of Immutability 10. Best of Both Worlds and Combining FP Paradigms with OOP 11. Case Study - Developing an iOS Application with FP and OOP Paradigms

Defining enumerations


In Swift, an enumeration defines a common type for related values and enables us to work with those values in a type-safe way. Values provided for each enumeration member can be a String, Character, Integer, or any floating-point type.

The following example presents a simple definition of an enum:

enum MLSTeam { 
    case montreal 
    case toronto 
    case newYork 
    case columbus 
    case losAngeles 
    case seattle 
} 

let theTeam = MLSTeam.montreal 

enum MLSTeam provides options for MLS teams. We can choose only one of the options each time; in our example, montreal is chosen.

Multiple cases can be defined and separated by a comma on a single line:

enum MLSTeam { 
    case montreal, toronto, newYork, columbus, lA, seattle 
} 
var theTeam = MLSTeam.montreal 

The type of theTeam is inferred when it is initialized with MLSTeam.montreal. As theTeam is already defined, we can change it with a shorter syntax as follows:

theTeam = .newYork 

In Swift, enums are very powerful...

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