Learning Functional Programming in Go

Function literals, Monads, Lazy evaluation, Currying, and more

About This Book

• Write concise and maintainable code with streams and high-order functions
• Understand the benefits of currying your Golang functions
• Learn the most effective design patterns for functional programming and learn when to apply each of them
• Build distributed MapReduce solutions using Go

Who This Book Is For

This book is for Golang developers comfortable with OOP and interested in learning how to apply the functional paradigm to create robust and testable apps. Prior programming experience with Go would be helpful, but not mandatory.

What You Will Learn

• Learn how to compose reliable applications using high-order functions
• Explore techniques to eliminate side-effects using FP techniques such as currying
• Use first-class functions to implement pure functions
• Understand how to implement a lambda expression in Go
• Compose a working application using the decorator pattern
• Create faster programs using lazy evaluation
• Use Go concurrency constructs to compose a functionality pipeline
• Understand category theory and what it has to do with FP

In Detail

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.

Style and approach

This book takes a pragmatic approach and shows you techniques to write better functional constructs in Golang. We'll also show you how use these concepts to build robust and testable apps.

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