Book Image

Functional C#

Book Image

Functional C#

Overview of this book

Functional programming makes your application faster, improves performance, and increases your productivity. C# code is written at a higher level of abstraction, so that code will be closer to business requirements, abstracting away many low-level implementation details. This book bridges the language gap for C# developers by showing you how to create and consume functional constructs in C#. We also bridge the domain gap by showing how functional constructs can be applied in business scenarios. We’ll take you through lambda expressions and extension methods, and help you develop a deep understanding of the concepts and practices of LINQ and recursion in C#. By the end of the book, you will be able to write code using the best approach and will be able to perform unit testing in functional programming, changing how you write your applications and revolutionizing your projects.
Table of Contents (19 chapters)
Functional C#
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

The advantages of using lambda expression in functional programming


Lambda expressions are not only a powerful way to provide a shorthand notation for anonymous methods, but they are also used in functional programming. In this section, we will go through the advantages of using the lambda expression in the context of functional programming.

First-class functions

In Chapter 1, Tasting Functional Style in C#, we discussed the idea of first-class functions when we were discussing functional programming. If functions are fire class Functions, functions obey value semantics. They can be passed as a parameter, returned from a function, and so on. If we go back to the earlier topic about lambda expressions, we have a project named SimpleLambdaExpression.csproj, which has the following simple lambda expression:

public partial class Program 
{ 
  static Func<string, string> displayMessageDelegate = 
    str => String.Format(Message: {0}", str); 
} 

Then, we can add...