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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

Dissecting pattern matching in functional programming

In functional programming, pattern matching is a form of dispatch to choose the correct variant of the functions to be called. It's actually inspired by a standard mathematical notation with the syntax to express conditional execution. We can start our discussion on matching pattern by borrowing the code from Chapter 1, Tasting Functional Style in C#, when we talked about recursion. The following is the GetFactorial() functional we used to retrieve a factorial value:

public partial class Program 
{ 
  private static intGetFactorial(intintNumber) 
  { 
    if (intNumber == 0) 
    { 
      return 1; 
    } 
    returnintNumber * GetFactorial(intNumber - 1); 
  } 
} 

As we can see in the preceding code, it gives us two definitions. In this case, the dispatcher is chosen based on whether the actual intNumber parameter pattern matches 0 or not. The use of the pattern matching are closer to this if conditional expression since we...

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