Functional Programming for Mortals with Scalaz

License: CC-BY-SA-4.0

Language: Scala

Keywords: book, cats, functional-programming, scala

“Functional Programming in Scala with Cats” is a book aimed at Scala developers with an Object Oriented (OOP) background who wish to learn the Functional Programming (FP) paradigm.


Scala is missing a comprehensive and practical introduction to FP. We do not believe that learning Haskell should be a prerequisite. We also do not accept that the merits of FP are obvious. Therefore, this book justifies every concept with practical examples, in Scala.

We recommend The Red Book as further reading. It is a textbook to learn the fundamentals and write your own FP library in Scala, serving a different purpose than this book.

Call for Action

This book is not yet written. You need to help.

If FP is going to become more than a niche within the Scala community, it needs to be easy to learn and use by the typical OOP developer.

We feel that the best people to write this book are OOP developers who find the existing material lacking. If you are trying to learn FP, you can help out by contributing material as you progress in your journey.

If you are an expert in FP, you can help out by assisting the authors in their journey to understand, e.g. answering questions in drone-dynamic-agents.


This book is libre and distributed under the terms of the Creative Commons BY-SA (copyleft) license, meaning that any derivative works must also be libre. But the book is not free (gratis) to write or produce. If you feel that you have benefited from this book, please contribute or donate to the ENSIME project.

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