Book Image

Hands-On Functional Programming with C++

By : Alexandru Bolboaca
Book Image

Hands-On Functional Programming with C++

By: Alexandru Bolboaca

Overview of this book

Functional programming enables you to divide your software into smaller, reusable components that are easy to write, debug, and maintain. Combined with the power of C++, you can develop scalable and functional applications for modern software requirements. This book will help you discover the functional features in C++ 17 and C++ 20 to build enterprise-level applications. Starting with the fundamental building blocks of functional programming and how to use them in C++, you’ll explore functions, currying, and lambdas. As you advance, you’ll learn how to improve cohesion and delve into test-driven development, which will enable you in designing better software. In addition to this, the book covers architectural patterns such as event sourcing to help you get to grips with the importance of immutability for data storage. You’ll even understand how to “think in functions” and implement design patterns in a functional way. By the end of this book, you’ll be able to write faster and cleaner production code in C++ with the help of functional programming.
Table of Contents (23 chapters)
Free Chapter
1
Section 1: Functional Building Blocks in C++
7
Section 2: Design with Functions
12
Section 3: Reaping the Benefits of Functional Programming
17
Section 4: The Present and Future of Functional Programming in C++

Test-Driven Development for Functional Programming

Test-driven development (TDD) is a very useful method for designing software. The method is as follows—we first write one single test that fails, then we implement the minimum code to make the test pass, and finally we refactor. We do this in small cycles in quick succession.

We will look at how pure functions simplify tests and provide an example of applying TDD with functions. Pure functions allow us to write simple tests because they always return the same values for the same input parameters; therefore, they are equivalent to big data tables. We can therefore write tests that emulate data tables for inputs and the expected outputs.

The following topics will be covered in this chapter:

  • How to use data-driven tests to take advantage of pure functions
  • Understanding the basics of the TDD cycle
  • How to design a pure function...