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Swift Functional Programming

Swift Functional Programming

By : Nayebi
4.3 (3)
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Swift Functional Programming

Swift Functional Programming

4.3 (3)
By: 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 (12 chapters)
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Pure functions


Pure functions are functions that do not possess any side effects; in other words, they do not change or alter any data or state outside of themselves. Additionally, they do not access any data or state except their provided parameters. Pure functions are like mathematical functions that are pure by nature.

Pure functions return a value that is only determined by its parameter values. Pure functions are easy to test as they rely only on their parameters and do not change or access any data or state outside of themselves. Pure functions are suitable for concurrency as they do not access and change global data or states.

The following list presents examples of pure and not pure functions:

  • Printing a String literal to a console is not pure as it modifies an external state.
  • Reading a file is not pure as it depends on the external state at different times.
  • The length of a String is pure as it does not rely on a state. It only takes a String as input and returns the length as output...

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