Book Image

Learning Functional Programming in Go

By : Lex Sheehan
Book Image

Learning Functional Programming in Go

By: Lex Sheehan

Overview of this book

Lex Sheehan begins slowly, using easy-to-understand illustrations and working Go code to teach core functional programming (FP) principles such as referential transparency, laziness, recursion, currying, and chaining continuations. This book is a tutorial for programmers looking to learn FP and apply it to write better code. Lex guides readers from basic techniques to advanced topics in a logical, concise, and clear progression. The book is divided into four modules. The first module explains the functional style of programming: pure functional programming, manipulating collections, and using higher-order functions. In the second module, you will learn design patterns that you can use to build FP-style applications. In the next module, you will learn FP techniques that you can use to improve your API signatures, increase performance, and build better cloud-native applications. The last module covers Category Theory, Functors, Monoids, Monads, Type classes and Generics. By the end of the book, you will be adept at building applications the FP way.
Table of Contents (21 chapters)
Title Page
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Index

Summary


FP is a programming style that is declarative. It is more readable and usually requires much less code than our imperative or object-oriented implementation options.

In this chapter, we implemented the Map, Filter, and Reduce high-order functions. We studied closures and looked at how currying enables function composition.

Our Reduce implementation demonstrated how to use Goroutines and a Go channel to perform lazy evaluation. We managed its concurrency using a WaitGroup variable and some common sense.

In the next chapter, we'll consider the API software design. We'll look at how to build composable systems using interfaces and closures to enforce the single responsibility principle and
 the open/close principle.