Book Image

Hands-On Functional Programming in Rust

By : Andrew Johnson
Book Image

Hands-On Functional Programming in Rust

By: Andrew Johnson

Overview of this book

Functional programming allows developers to divide programs into smaller, reusable components that ease the creation, testing, and maintenance of software as a whole. Combined with the power of Rust, you can develop robust and scalable applications that fulfill modern day software requirements. This book will help you discover all the Rust features that can be used to build software in a functional way. We begin with a brief comparison of the functional and object-oriented approach to different problems and patterns. We then quickly look at the patterns of control flow, data the abstractions of these unique to functional programming. The next part covers how to create functional apps in Rust; mutability and ownership, which are exclusive to Rust, are also discussed. Pure functions are examined next and you'll master closures, their various types, and currying. We also look at implementing concurrency through functional design principles and metaprogramming using macros. Finally, we look at best practices for debugging and optimization. By the end of the book, you will be familiar with the functional approach of programming and will be able to use these techniques on a daily basis.
Table of Contents (12 chapters)

Mutability, Ownership, and Pure Functions

Rust has introduced some new concepts of its own with respect to object ownership. These safeguards protect the developer from certain classes of errors, such as double free memory or hanging pointers, but also create constraints that can feel unmerited at times. Functional programming may help ease some of this conflict by encouraging the use of immutable data and pure functions.

In this chapter, we will look at a case of ownership gone wrong. You will inherit code that has been abandoned as being too difficult to work with. Your job in this chapter will be to address the problems that the previous team were unable to overcome. To achieve this, you will need to use much of what you have learned so far, along with a gained understanding of the specific behaviors and constraints of ownership in Rust.

Learning outcomes:

  • Recognizing anti...