Book Image

Swift Functional Programming - Second Edition

By : Dr. Fatih Nayebi
Book Image

Swift Functional Programming - Second Edition

By: Dr. Fatih Nayebi

Overview of this book

Swift is a multi-paradigm programming language enabling you to tackle different problems in various ways. Understanding each paradigm and knowing when and how to utilize and combine them can lead to a better code base. Functional programming (FP) is an important paradigm that empowers us with declarative development and makes applications more suitable for testing, as well as performant and elegant. This book aims to simplify the FP paradigms, making them easily understandable and usable, by showing you how to solve many of your day-to-day development problems using Swift FP. It starts with the basics of FP, and you will go through all the core concepts of Swift and the building blocks of FP. You will also go through important aspects, such as function composition and currying, custom operator definition, monads, functors, applicative functors,memoization, lenses, algebraic data types, type erasure, functional data structures, functional reactive programming (FRP), and protocol-oriented programming(POP). You will then learn to combine those techniques to develop a fully functional iOS application from scratch
Table of Contents (19 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Dedication
Preface

Cases for mutability


Whenever we require to change an immutable object, we will need to create a new, modified copy of it. This might not be costly and tedious for small and simple objects, but will be in cases where we have large or complex objects with lots of properties and operations.

Also, changing an existing object is simpler and much more intuitive than creating a new, modified copy of it for objects with a distinct identity, for instance, a profile of a user. We may want to maintain a single object of a user's profile and modify it when necessary. This might not be a great example as it is hard to see the performance penalty for this case, but the speed of execution can be a very important differentiator for some types of application, such as games. As an example, representing our game characters with mutable objects may make our game run faster than an alternative implementation where we will need to create a new, modified copy of the game character whenever we need to change it...