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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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 Nayebi Nayebi
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Nayebi
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Table of Contents (19) Chapters Close

Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Dedication
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

Immutability


An immutable object is an object whose state cannot be modified after it is initiated. This quality of immutable objects is essential in multi-threaded applications because it allows a thread to act on the data represented by immutable objects without worrying about changes from other threads. In addition, immutability provides lots of benefits, such as referential transparency and low coupling, which we will talk about in upcoming sections.

An object is considered immutable if the object itself, and in fact all of its properties, are immutable. In some cases, an object is considered immutable even if some of its internal properties change but the object's state appears to be immutable from an external point of view. For instance, an object that uses the memoization technique to cache the results of resource-greedy calculations can be considered as an immutable object.

Immutable objects have the following features:

  • They are simple to construct, test, and use
  • They are simple to understand...
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