Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Free Learning
Arrow right icon
Functional Programming with C#
Functional Programming with C#

Functional Programming with C#: Unlock coding brilliance with the power of functional magic

eBook
€8.99 €28.99
Paperback
€35.99
Subscription
Free Trial
Renews at €18.99p/m

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
Product feature icon AI Assistant (beta) to help accelerate your learning
OR
Modal Close icon
Payment Processing...
tick Completed

Shipping Address

Billing Address

Shipping Methods
Table of content icon View table of contents Preview book icon Preview Book

Functional Programming with C#

Getting Started with Functional Programming

Functional programming is a way of thinking about software based on treating computation as the evaluation of mathematical functions. It avoids changing state and mutable data, focusing instead on pure functions, immutability, and composing functions to solve complex problems. By sticking to these principles, functional programming creates code that is more predictable, easier to understand, and less prone to bugs.

But why should you consider adopting functional programming in your projects? The benefits are many, including the following:

  • Increased readability and maintainability: Functional code is often more concise and expressive, making it easier to read and maintain. By focusing on what needs to be done rather than how to do it, functional programming promotes clearer and more readable code.
  • Enhanced testability: Pure functions always produce the same output for a given input and have no side effects, making them easier...

Functional versus imperative versus object-oriented programming

To fully appreciate the power of functional programming, it’s essential to understand how it differs from other paradigms, such as imperative and object-oriented programming.

Imperative programming

Imperative programming is the traditional approach in many languages. It focuses on explicitly specifying the sequence of steps to solve a problem. This style relies heavily on mutable state and side effects, which can make code more prone to bugs and harder to understand as the code base grows.

Object-oriented programming

Object-oriented programming (OOP) organizes code around objects, which encapsulate data and behavior. OOP is great for modeling real-world entities and promoting encapsulation. However, it can sometimes lead to complex hierarchies and tight coupling between objects, making code harder to modify and test.

Functional programming

Functional programming, in contrast, emphasizes pure functions...

How functional programming is supported in C#

C# has evolved significantly over the years, incorporating a range of functional programming features that make it a powerful language for this paradigm. Let’s take a closer look at some of these features and how they support functional programming:

  • Lambda expressions: These provide a concise syntax for creating anonymous functions, enabling easy creation of higher-order functions
  • LINQ: This provides a set of extension methods that enable functional-style operations such as filtering, mapping, and reducing collections
  • Immutable data types: Data types such as strings and tuples guarantee that once created, their values cannot be changed
  • Pattern matching: This allows us to test values against patterns and extract data based on those patterns
  • Delegates and events: These allow you to treat functions as first-class citizens, passing them as arguments and storing them in variables

Throughout this book, we...

How to write functional code in C#

Writing functional code in C# means the implementation of functional concepts and techniques that will help us write functional code:

  • Expressions: By favoring expressions over statements, we can write more declarative code that focuses on the desired result rather than the steps to achieve it.
  • Pure functions: A pure function always produces the same output for a given input and has no side effects. It relies solely on its input parameters and does not modify any external state. Using pure functions, we can create easier code to reason about, test, and parallelize.
  • Honest functions: Honest functions are an extension of pure functions that provide a clear and unambiguous contract. They explicitly communicate their input requirements and potential output scenarios, including error cases. Honest functions enhance code readability, maintainability, and error handling.
  • Higher-order functions: These functions can accept other functions...

A practical example – a book publishing system

Let’s examine an example that demonstrates functional programming concepts using a book publishing system scenario:

public record Book(string Title, string Author, int Year, string Content);
// Pure function to validate a book
private static bool IsValid(Book book) =>
     !string.IsNullOrEmpty(book.Title) &&
     !string.IsNullOrEmpty(book.Author) &&
     book.Year > 1900 &&
     !string.IsNullOrEmpty(book.Content);
// Pure function to format a book
private static string FormatBook(Book book) =>
     $"{book.Title} by {book.Author} ({book.Year})";
// Higher-order function for processing books
private static IEnumerable<T> ProcessBooks<R>(
     IEnumerable<Book> books,
     Func<Book...

How to combine functional and object-oriented paradigms

One of the strengths of C# is its ability to seamlessly combine functional and object-oriented programming paradigms. By leveraging the best of both worlds, we can create code that is modular, reusable, and expressive. Here are some strategies for combining functional and object-oriented programming:

  • Immutable objects: Immutable objects are thread-safe, easier to reason about, and align well with functional programming principles
  • Extension methods: These allow us to enhance the functionality of types without modifying their original implementation, promoting a more functional and compositional approach
  • Higher-order functions as instance methods: This approach helps us to encapsulate behavior and provide a fluent and expressive API for working with objects in a functional manner
  • Dependency injection and composition: By injecting functional dependencies and composing objects based on their behavior, you can achieve...

Meet Steve and Julia

To make our journey through functional programming in C# more engaging and relatable, let’s introduce our main characters: Steve and Julia.

Steve is a middle-level C# software developer who has heard that functional programming can help him write better code, become more valuable at his current job, and gain an advantage over other candidates if he decides to pursue a new opportunity. He’s eager to learn but unsure where to start.

Julia, on the other hand, is already an expert in functional programming in C#. She’s passionate about the paradigm and enjoys sharing her knowledge with others. Throughout the book, Julia will provide Steve with advice, guidance, and practical examples to help him master functional programming concepts.

As we progress through the chapters, we’ll follow Steve’s journey as he learns from Julia and applies functional programming techniques to real-world scenarios.

Summary

Congratulations on taking the first step toward mastering functional programming in C#! In this chapter, we’ve explored the differences between functional, imperative, and object-oriented programming paradigms. We’ve also delved into the functional features of C#, such as lambda expressions, LINQ, immutable data types, pattern matching, and delegates, and how they support functional programming.

Furthermore, we’ve introduced the concepts and techniques for writing functional code in C# such as expressions, pure functions, honest functions, higher-order functions, functors, and monads. Finally, we’ve discussed strategies for combining functional and object-oriented programming in C#, allowing us to leverage the best of both paradigms in our projects.

As we progress through the next chapters, we’ll dive deeper into each of these concepts, learning how to write cleaner, more modular, and more testable code using functional principles.

...
Left arrow icon Right arrow icon

Key benefits

  • Master functional programming in C# for expressive, modular code
  • Apply advanced concepts such as error handling and asynchronous programming to overcome real-world challenges
  • Gain practical coding skills through practical application and self-assessment questions
  • Purchase of the print or Kindle book includes a free PDF eBook

Description

In an era where software complexity is increasing by the day, functional programming offers a paradigm that simplifies code maintenance and enhances reliability. Functional Programming with C# takes you on an exhaustive journey into functional programming within C#. The book familiarizes you with the core principles and benefits of functional programming, juxtaposing it with imperative and object-oriented paradigms. You’ll get to grips with the functional features of C# and learn to write expressive, modular code through expressions, pure functions, and higher-order functions. As you advance, you’ll explore advanced concepts such as error handling and asynchronous programming, which will equip you with the practical skills that you need to tackle real-world challenges. By comparing functional programming in C# with other languages and providing additional resources, this book ensures that you’re well-equipped to continue your journey toward mastery in functional programming. By the end of this book, you’ll have gained a thorough understanding of functional programming techniques, such as recursion, memoization, and composition, empowering you to write robust, maintainable code.

Who is this book for?

This book is for intermediate-to-advanced C# developers looking to expand their programming paradigm horizons. Software engineers, developers, and programmers familiar with C# and object-oriented programming who want to delve deeper into functional programming concepts will find this book very useful. This book is ideal for professionals aiming to enhance code modularity, readability, and scalability. While prior knowledge of C# is necessary, beginners with a strong grasp of programming fundamentals can also benefit from the clear explanations and practical exercises provided.

What you will learn

  • Understand the core principles of functional programming
  • Differentiate functional, imperative, and OOP paradigms
  • Write expressive code with higher-order functions
  • Handle errors effectively using functional techniques
  • Utilize asynchronous programming for concurrent tasks
  • Grasp advanced concepts, such as recursion and memoization
Estimated delivery fee Deliver to Slovakia

Premium delivery 7 - 10 business days

€25.95
(Includes tracking information)

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : Jul 31, 2024
Length: 258 pages
Edition : 1st
Language : English
ISBN-13 : 9781805122685
Category :
Languages :
Tools :

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
Product feature icon AI Assistant (beta) to help accelerate your learning
OR
Modal Close icon
Payment Processing...
tick Completed

Shipping Address

Billing Address

Shipping Methods
Estimated delivery fee Deliver to Slovakia

Premium delivery 7 - 10 business days

€25.95
(Includes tracking information)

Product Details

Publication date : Jul 31, 2024
Length: 258 pages
Edition : 1st
Language : English
ISBN-13 : 9781805122685
Category :
Languages :
Tools :

Packt Subscriptions

See our plans and pricing
Modal Close icon
€18.99 billed monthly
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Simple pricing, no contract
€189.99 billed annually
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just €5 each
Feature tick icon Exclusive print discounts
€264.99 billed in 18 months
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just €5 each
Feature tick icon Exclusive print discounts

Frequently bought together


Stars icon
Total 109.97
C# Data Structures and Algorithms
€37.99
Systems Programming with C# and .NET
€35.99
Functional Programming with C#
€35.99
Total 109.97 Stars icon
Banner background image

Table of Contents

17 Chapters
Part 1:Foundations of Functional Programming in C# Chevron down icon Chevron up icon
Chapter 1: Getting Started with Functional Programming Chevron down icon Chevron up icon
Chapter 2: Expressions and Statements Chevron down icon Chevron up icon
Chapter 3: Pure Functions and Side Effects Chevron down icon Chevron up icon
Chapter 4: Honest Functions, Null, and Option Chevron down icon Chevron up icon
Part 2:Advanced Functional Techniques Chevron down icon Chevron up icon
Chapter 5: Error Handling Chevron down icon Chevron up icon
Chapter 6: Higher-Order Functions and Delegates Chevron down icon Chevron up icon
Chapter 7: Functors and Monads Chevron down icon Chevron up icon
Part 3:Practical Functional Programming Chevron down icon Chevron up icon
Chapter 8: Recursion and Tail Calls Chevron down icon Chevron up icon
Chapter 9: Currying and Partial Application Chevron down icon Chevron up icon
Chapter 10: Pipelines and Composition Chevron down icon Chevron up icon
Part 4:Conclusion and Future Directions Chevron down icon Chevron up icon
Chapter 11: Reflecting and Looking Ahead Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon
Get free access to Packt library with over 7500+ books and video courses for 7 days!
Start Free Trial

FAQs

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