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Functional C#

You're reading from   Functional C# Uncover the secrets of functional programming using C# and change the way you approach your applications

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Product type Paperback
Published in Dec 2016
Publisher Packt
ISBN-13 9781785282225
Length 370 pages
Edition 1st Edition
Languages
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Author (1):
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Wisnu Anggoro Wisnu Anggoro
Author Profile Icon Wisnu Anggoro
Wisnu Anggoro
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Table of Contents (12) Chapters Close

Preface 1. Tasting Functional Style in C# 2. Walkthrough Delegates FREE CHAPTER 3. Expressing Anonymous Methods with Lambda Expressions 4. Extending Object Functionality with Extension Methods 5. Querying Any Collection Easily with LINQ 6. Enhancing the Responsiveness of the Functional Program with Asynchronous Programming 7. Learning Recursion 8. Optimizing the Code using Laziness and Caching Techniques 9. Working with Pattern 10. Taking an Action in C# Functional Programming 11. Coding Best Practice and Testing the Functional Code

Summary

The honest signature is important not only in functional approach but also every time we code, since, basically, the signature has to deliver all the information about the possible accepted input values and possible produced output. By implementing honest signature, we will be aware of the value we pass into the method parameter. We have to ensure that we have an immutable class as well in order to get functional because mutable operations will make our code dishonest.

Although we have to avoid side-effects in our pure function, it's nearly impossible to really avoid side-effects in our code. What we can do then is deal with it. We can use the command-query separation (CQS) principle to separate methods that generate side-effects and methods that don't. If the method returns a value, it will be a query and doesn't mutate anything. If the method returns nothing, it must be a command and will leave some side-effects in the system.

We can also separate our code into...

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