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

Choosing between fluent syntax and query expression syntax


From our preceding discussion, we found two types of querying syntaxes so far. Let's discuss this further by distinguishing these two syntaxes.

IEnumerable<int> queryInt = 
  intList.Select(i => i * 2); 
int queryIntCount = queryInt.Count(); 

The preceding code snippet is the fluent syntax type. We invoke the Select and Count operators by invoking their extension method in the Enumerable class. Using the fluent syntax, we can also chain the method so it will approach functional programming as follows:

IEnumerable<int> queryInt = 
  intList 
    .Select(i => i * 2); 
    .Count(); 

Another syntax type we can use in querying data in LINQ is query expression syntax. We applied this syntax type when we discussed deferred execution in the previous topic. The code snippet of the query expression syntax is as follows:

IEnumerable<Member> memberQuery = 
  from m in memberList ...