I really enjoyed reading Kyle's book on functional programming. I even use some of the examples from the book in my day to day office job.

The book is written well; It is clear, concise, and has a sequence that is a helpful scaffolding for learning. I believe that this book has improved my manner of communicating with other people, programmers and non - programmers.

I really enjoyed this book as an in depth look and I was confused when the author says you should be. There were times I really got lost, namely when the pure FP style was used. The only reason I don't give it a 5 is some content was a bit difficult to follow and some of the 'why' escaped me.

Very well written, with lots of thought provoking information. The author shares his experience learning FP, which provides for an enjoyable read.

This book delivered on its description. I learned about functional programming through examples in javascript that are relatable to my projects. Of course this book does not solve all my project needs but it gave me a solid base to create functional solutions.

Very approachable guide to a difficult subject. As always Kyle explains topics in depth with helpful examples

really good book. functional programing explained very well

I just started reading and have finished the first two chapters. So far very interesting.

Spectacular!!! I’ve just bought and it is 19% read. It’s amazing book. The author is great and I believe I will read other amazing book from Kyle.

tengo todas las publicaciones de Kyle Simpson y las recomiendo todas. Este es un magnifico libro tanto para todos los niveles

Very disappointed with this book. Kyle is a very knowledgable individual with excellent JavaScript insight. His free books about "You don't know JS" are a fantastic resource which every front-end developer should read. I already know alot about FP (Functional Programming) but after reading this entire book, there is was not much to take away from this book. It is clear Kyle enjoys FP but not sure what the purpose of the book is. It contains plenty of code snippets but nothing to show the power and the brain-bending thought process which it sometimes requires.

I would recommend reading some free introductions to FP online and learn the "proper" way without the confusion produced by this book. You might want to really learn ES6 (destructing, rest, spread and array methods) and truly understand JavaScript and all of its quirks.