I read this book a year ago, so I’d like to revisit it and provide more thorough feedback. I figure my Rust knowledge will transfer well, and I’m planning on learning Gleam, so it can’t hurt!

Overview

This book is an accessible and witty take on functional programming—it isn’t a “tome!” It’s written in JavaScript, so the barrier to entry isn’t too high

Since the included exercises use Node 10, so it was a bit jarring moving back to a life without modules. The book is being updated to ES6 if you’d like to help!

The book holds well—I highly recommend it to anyone looking to dip their feet into Functional Programming

The Case for Purity

If you read any part of this book, read “The Case for Purity”.

Pure functions are

• cacheable
• testable
• portable
• transparent (can tell all dependencies from function signature)
• parallelizable