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++

Good properties, bad properties

Since properties are an abstraction level higher than the examples, it's easy to implement them in a confusing or unclear manner. You already need to pay a lot of attention to example-based tests; you now need to up your efforts in relation to the property-based tests.

First of all, good properties are like good unit tests. We want, therefore to have properties that are as follows:

  • Small
  • Named appropriately and clearly
  • Giving a very clear message when they fail
  • Fast
  • Repeatable

There's one caveat with property-based tests though—since we're using random values, shouldn't we expect random failures? Well, when a property-based test fails, we learn something new about our code, so it's a reason for celebration. We should expect, however, to have fewer failures as time passes by and we remove our bugs. If your property...