Book Image

Learn C# Programming

By : Marius Bancila, Raffaele Rialdi, Ankit Sharma
5 (1)
Book Image

Learn C# Programming

5 (1)
By: Marius Bancila, Raffaele Rialdi, Ankit Sharma

Overview of this book

The C# programming language is often developers’ primary choice for creating a wide range of applications for desktop, cloud, and mobile. In nearly two decades of its existence, C# has evolved from a general-purpose, object-oriented language to a multi-paradigm language with impressive features. This book will take you through C# from the ground up in a step-by-step manner. You'll start with the building blocks of C#, which include basic data types, variables, strings, arrays, operators, control statements, and loops. Once comfortable with the basics, you'll then progress to learning object-oriented programming concepts such as classes and structures, objects, interfaces, and abstraction. Generics, functional programming, dynamic, and asynchronous programming are covered in detail. This book also takes you through regular expressions, reflection, memory management, pattern matching, exceptions, and many other advanced topics. As you advance, you'll explore the .NET Core 3 framework and learn how to use the dotnet command-line interface (CLI), consume NuGet packages, develop for Linux, and migrate apps built with .NET Framework. Finally, you'll understand how to run unit tests with the Microsoft unit testing frameworks available in Visual Studio. By the end of this book, you’ll be well-versed with the essentials of the C# language and be ready to start creating apps with it.
Table of Contents (20 chapters)

More functional programming concepts

At the beginning of this chapter, we looked at general functional programming concepts, mainly higher-order functions and immutability. In this section, we will explore several more functional programming concepts and techniques—partial function application, currying, closures, monoids, and monads.

Partial function application

Partial function application is the process of taking a function with N parameters and one argument and returning another function with N-1 parameters after fixing the argument into one of the function's parameters. It is, of course, possible that the invocation is done with more than just one argument, say, M, in which case the returned function will have N-M parameters.

To understand how this works, let's start with a function that has several parameters and is returning a string (containing the value of the arguments):

string AsString(int a, double b, string c)
{
    return...