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Home > Programming > Functional Programming > Swift Functional Programming
Swift Functional Programming
Swift Functional Programming

Swift Functional Programming: Ease the creation, testing, and maintenance of Swift codes , Second Edition

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Swift Functional Programming

Functions and Closures

In the previous chapter, we had an overview of Functional Programming (FP) and the Swift programming language. It introduced some of the key concepts of functions. As functions are the fundamental building blocks in FP, this chapter dives deeper into the subject and explains all the aspects related to the definition and usage of functions in Swift and FP, together with coding examples.

This chapter starts with the Swift function and method syntax, continues with other related topics such as function types and tuples, and finally concludes with FP topics such as first-class functions, higher-order functions, function composition, closures, currying, recursion, and memoization.

This chapter will cover the following topics by coding examples:

  • General syntax of functions
  • Defining and using function parameters
  • Setting internal and external parameters
  • Setting default parameter values
  • Defining and...

What is a function?

Object-oriented programming (OOP) looks very natural to most developers as it simulates a real-life situation of classes or, in other words, blueprints and their instances. However, it brings a lot of complexities and problems such as instance and memory management, complex multithreading, and concurrency programming.

Before OOP became mainstream, we were used to developing in procedural languages. In the C programming language, we did not have objects and classes, and we would use structs and function pointers. FP relies mostly on functions, just as procedural languages relied on procedures. We can develop very powerful programs in C without classes; in fact, most operating systems are developed in C. There are other multipurpose programming languages, such as Go by Google. This is not object-oriented and is getting very popular because of its performance and simplicity.

So, are we going to...

Syntax

In this section, we will deep dive into Swift function and method syntax. Boring stuff alert! To make it a little more interesting, revisit or remember the function definition in mathematics and compare the functions and methods you write to math functions.

If you think that you already know the details or if it is not that interesting for you now, you can fast read or skip this first section, and go to the Return values from functions section of this chapter as it is directly related to FP.

Let's get it over with! We define functions or methods as the following:

accessControl methodForm func functionName(parameter: ParameterType) throws -> ReturnType { }

As we know already, when functions are defined in objects they become methods.

The first step to define a method is to tell the compiler where it can be accessed. This concept is called access control in Swift and there are five levels of access...

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...

Function types

Along with, classes, structs, enums, and protocols, functions can also be used as types in Swift. In this section, we will explore how we can define functions as types and how we can use function types. Let's first discover what the type of the function is and how it is defined.

A function parameter type along with its return type defines the type of the function. For instance, the function type for the following coding example is (Int, Double) -> String:

func functionName(firstParam: Int, secondParam: Double) -> String

We will be able to use function types in the way we use other types. The following code example presents a function type:

var simpleMathOperator: (Double, Double) -> Double

Here, simpleMathOperator is a variable of a function of the (Double, Double) -> Double type. In other words, simpleMathOperator stores a function that accepts two Double parameters and...

What is a function?

Object-oriented programming (OOP) looks very natural to most developers as it simulates a real-life situation of classes or, in other words, blueprints and their instances. However, it brings a lot of complexities and problems such as instance and memory management, complex multithreading, and concurrency programming.

Before OOP became mainstream, we were used to developing in procedural languages. In the C programming language, we did not have objects and classes, and we would use structs and function pointers. FP relies mostly on functions, just as procedural languages relied on procedures. We can develop very powerful programs in C without classes; in fact, most operating systems are developed in C. There are other multipurpose programming languages, such as Go by Google. This is not object-oriented and is getting very popular because of its performance and simplicity.

So, are we going to be able to write very complex applications without classes in Swift? We might wonder...

Syntax

In this section, we will deep dive into Swift function and method syntax. Boring stuff alert! To make it a little more interesting, revisit or remember the function definition in mathematics and compare the functions and methods you write to math functions.

If you think that you already know the details or if it is not that interesting for you now, you can fast read or skip this first section, and go to the Return values from functions section of this chapter as it is directly related to FP.

Let's get it over with! We define functions or methods as the following:

accessControl methodForm func functionName(parameter: ParameterType) throws -> ReturnType { }

As we know already, when functions are defined in objects they become methods.

The first step to define a method is to tell the compiler where it can be accessed. This concept is called access control in Swift and there are five levels of access control. We are going to explain them for methods as follows:

  • open and public access: Any...

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...

Function types

Along with, classes, structs, enums, and protocols, functions can also be used as types in Swift. In this section, we will explore how we can define functions as types and how we can use function types. Let's first discover what the type of the function is and how it is defined.

A function parameter type along with its return type defines the type of the function. For instance, the function type for the following coding example is (Int, Double) -> String:

func functionName(firstParam: Int, secondParam: Double) -> String

We will be able to use function types in the way we use other types. The following code example presents a function type:

var simpleMathOperator: (Double, Double) -> Double

Here, simpleMathOperator is a variable of a function of the (Double, Double) -> Double type. In other words, simpleMathOperator stores a function that accepts two Double parameters and returns a Double value.

To make it a little easier to read, we could define typealias for the function...

First-class functions

In the Function types section of this chapter, we saw that we can define function types and store and pass functions around. In practice, this means that Swift treats functions as values. To explain this, we will need to examine a couple of examples:

let name: String = "Grace"

In this code example, we create a constant of the String type name and store a value ("Grace") into it.

When we define a function, we need to specify the type of parameter, as follows:

func sayHello(name: String) { 
    print("Hello, \(name)") 
}

In this example, our name parameter is of the String type. This parameter could be any other value type or reference type. Simply, it could be Int, Double, Dictionary, Array, Set, or it could be an object type such as an instance of class, struct, or enum.

Now, let's call this function:

sayHello(name: "Your name") // or 
sayHello(name: name)

Here, we pass a value for this parameter. In other words, we pass one of the previously mentioned types with their respective...

Higher-order functions

As we have seen in the Defining and using function parameters and Function types sections of this chapter, functions can accept functions as parameters in Swift. Functions that can accept other functions as parameters are called higher-order functions. This concept, along with first-class functions, empowers FP and function decomposition.

As this topic is essential in FP, we will go through another simple example.

Suppose that we need to develop two functions that add and subtract two Int values as follows:

func subtractTwoValues(a: Int, b: Int) -> Int { 
    return a - b 
} 

func addTwoValues(a: Int, b: Int) -> Int { 
    return a + b 
}

Also, we need to develop functions to calculate the square and triple of two Int values as follows:

func square(a: Int) -> Int { 
    return a * a 
} 

func triple(a: Int) -> Int { 
    return a * a * a // or return square(a) * a 
}

Suppose we need another function that subtracts the two squared values:

func subtractTwoSquaredValues...

Function composition

In the previous section, we saw an example of higher-order functions that could accept two different functions and execute them in a predefined order. This function was not so flexible in the sense that it would break if we wanted to combine two accepted functions differently. Function composition can solve this issue and make it even more flexible. To present this concept, we will examine an example of non-functional composition first, and then we will introduce functional composition.

Suppose that, in our application, we need to interact with a backend RESTful API and receive a String value that contains a list of prices in order. The backend RESTful API is being developed by a third-party and is not designed properly. Unfortunately, it returns a String with numbers in it separated by commas, as follows:

"10,20,40,30,80,60"

We need to format the content that we receive before using it. We will extract elements from String and create an array, and then we will append...

Closures

Closures are great tools for FP as they are functions without the func keyword and name. Like functions, closures are self-contained blocks of code that provide a specific functionality and can be stored, passed around, and used in the code. Closures capture the constants and variables of the context in which they are defined. Although closures are the equivalent of blocks in Objective-C, they have a simpler syntax in Swift compared to the C and Objective-C block syntax. Nested functions, which we have covered in a previous section, are special cases of closures. Closures are reference types that can be stored as variables, constants, and type aliases. They can be passed to and returned from functions.

Closure syntax

A general closure syntax is as follows:

 { (parameters) -> ReturnType in // body of closure }

A closure definition starts with {, then we define the closure type, and finally we use the in keyword to separate the closure definition from its implementation.

After the in...

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Key benefits

  • Written for the latest version of Swift, this is a comprehensive guide that introduces iOS, Web and macOS developers to the all-new world of functional programming that has so far been alien to them
  • Get familiar with using functional programming alongside existing OOP techniques so you can get the best of both worlds and develop clean, robust, and scalable code
  • Develop a case study on example backend API with Swift and Vapor Framework and an iOS application with Functional Programming, Protocol-Oriented Programming, Functional Reactive Programming, and Object-Oriented Programming techniques

Description

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

Who is this book for?

Meant for a reader who knows object-oriented programming, has some experience with Objective-C/Swift programming languages and wants to further enhance his skills with functional programming techniques with Swift 3.x.

What you will learn

  • Understand what functional programming is and why it matters
  • Understand custom operators, function composition, currying, recursion, and memoization
  • Explore algebraic data types, pattern matching, generics, associated type protocols, and type erasure
  • Get acquainted with higher-kinded types and higher-order functions using practical examples
  • Get familiar with functional and non-functional ways to deal with optionals
  • Make use of functional data structures such as semigroup, monoid, binary search tree, linked list, stack, and lazy list
  • Understand the importance of immutability, copy constructors, and lenses
  • Develop a backend API with Vapor
  • Create an iOS app by combining FP, OOP, FRP, and POP paradigms
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Apr 26, 2017
Length: 316 pages
Edition : 2nd
Language : English
ISBN-13 : 9781787284500
Vendor :
Apple
Category :
Programming
Languages :
Swift
Concepts :
Functional Programming
Tools :
Xcode

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Publication date : Apr 26, 2017
Length: 316 pages
Edition : 2nd
Language : English
ISBN-13 : 9781787284500
Vendor :
Apple
Category :
Programming
Languages :
Swift
Concepts :
Functional Programming
Tools :
Xcode

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Table of Contents

11 Chapters
Getting Started with Functional Programming in Swift Chevron down icon Chevron up icon
Getting Started with Functional Programming in Swift
Why functional programming matters
What is FP?
The Swift programming language
Summary
Functions and Closures Chevron down icon Chevron up icon
Functions and Closures
What is a function?
Syntax
Pure functions
Function types
First-class functions
Higher-order functions
Function composition
Closures
Function currying
Recursion
Memoization
Summary
Types and Type Casting Chevron down icon Chevron up icon
Types and Type Casting
Kinds of types
Value versus reference types
Equality versus identity
Equatable and Comparable
Type checking and casting
Summary
Enumerations and Pattern Matching Chevron down icon Chevron up icon
Enumerations and Pattern Matching
Defining enumerations
Algebraic data types
Pattern matching
Summary
Generics and Associated Type Protocols Chevron down icon Chevron up icon
Generics and Associated Type Protocols
What are Generics and what kind of problems do they solve?
Type constraints
Generic data structures
Associated type protocols
Type erasure
Extending Generic types
Subclassing Generic classes
Generics manifesto
Summary
Map, Filter, and Reduce Chevron down icon Chevron up icon
Map, Filter, and Reduce
Higher-kinded types
The map function
The flatMap method
The filter function
The reduce function
The apply function
The join function
Chaining higher-order functions
The zip function
Practical examples
Summary
Dealing with Optionals Chevron down icon Chevron up icon
Dealing with Optionals
Optional types
Unwrapping optionals
Guard
Implicitly-unwrapped optionals
Nil-coalescing
Optional chaining
Dealing with Optionals' functionally
Error handling
Summary
Functional Data Structures Chevron down icon Chevron up icon
Functional Data Structures
Semigroups
Monoids
Trees
Lists
Stacks
Lazy lists
Summary
Importance of Immutability Chevron down icon Chevron up icon
Importance of Immutability
Immutability
Immutable variables
Reference types versus value types
Benefits of immutability
Cases for mutability
An example
Copy constructors and lenses
Summary
Best of Both Worlds and Combining FP Paradigms with OOP Chevron down icon Chevron up icon
Best of Both Worlds and Combining FP Paradigms with OOP
OOP paradigms
OOP design principles
POP
Functional reactive programming
Mixing OOP and FP
Summary
Case Study - Developing an iOS Application with FP and OOP Paradigms Chevron down icon Chevron up icon
Case Study - Developing an iOS Application with FP and OOP Paradigms
Requirements
High-level design
Backend development
iOS application development
Summary

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Rating distribution
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scalzo giordano antonio Apr 28, 2017
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Detailed introduction to functional programming in Swift
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José Rafael Moraes Garcia da Rocha Oct 17, 2017
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Very well written, makes a complex subject become simple
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Nayebi
Dr. Fatih Nayebi has more than 15 years of industry experience in software engineering and architecture in various fields. He has developed numerous applications with Visual Basic, C++, C#, Java, MATLAB, Python, Objective-C, and Swift. He has been designing and developing enterprise and consumer iOS applications since the release of first iOS SDK. He is also an enthusiastic Node, Scala, and Haskell developer. Aside from industry, Fatih earned his Ph.D. degree in software engineering from cole de technologie suprieure, Universit du Qubec by researching on Mobile Human-Computer Interaction, Software Engineering, and Machine Learning. His specialties include applied predictive and optimization models, human-computer interaction, functional programming, machine learning, and mobile application architecture and development. Fatih currently works as a Director, Consulting at CGI Group Inc, Montreal, and continues to his academic research and publications as a postdoctoral researcher at cole de technologie suprieure. You can find him talking on Swift and Functional Programming at meetups such as http://www.meetup.com/swift-mtl/, on GitHub at https://github.com/conqueror, on Twitter as @thefatih, and on Instagram as @thefatih.
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FAQs

What is the digital copy I get with my Print order? Chevron down icon Chevron up icon

When you buy any Print edition of our Books, you can redeem (for free) the eBook edition of the Print Book you’ve purchased. This gives you instant access to your book when you make an order via PDF, EPUB or our online Reader experience.

What is the delivery time and cost of print book? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela