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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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Value versus reference types

In Swift, there are two kinds of types in terms of memory allocation: value and reference.

Value type instances keep a copy of their data. Each type has its own data and is not referenced by another variable. Structures, enums, and tuples are value types; therefore, they do not share data between their instances. Assignments copy the data of an instance to the other and there is no reference counting involved. The following example presents a struct with copying:

struct OurStruct { 
var data: Int = 3
}

var valueA = OurStruct()
var valueB = valueA // valueA is copied to valueB
valueA.data = 5 // Changes valueA, not valueB
print("\(valueA.data), \(valueB.data)") // prints "5, 3"

As seen from the preceding example, changing valueA.data does not change valueB.data.

In Swift, arrays, dictionaries, strings, and sets are all value types.

On the other hand, reference...

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