All 5 recommendations
Est. prices as of Feb 28, 2026
#1 · Eric Elliott · Crowd Favorite
Composing Software: An Exploration of Functional Programming and Object Composition in JavaScript
$29.99
The modern JavaScript dev's gateway drug to FP—practical, digestible, immediately applicable
- âś“ Uses JavaScript (the language most people actually use)
- âś“ Focuses on composition over theory
- âś“ Free online version available to start
- âś— Requires JavaScript knowledge as prerequisite
- âś— Some readers find the writing style conversational rather than rigorous
#2 · Abelson, Sussman & Sussman · Premium Pick
Structure and Interpretation of Computer Programs (SICP)
$59.99
The 1985 masterpiece that shaped how we think about programming itself
- âś“ Universally considered the definitive text on functional concepts
- âś“ Deep dives into lambda calculus and metaprogramming
- âś“ Exercises that fundamentally rewire your brain
- ✗ Uses Scheme—not practical for production work
- âś— Dense and challenging; expect 100+ hours of study
- âś— Dated examples feel disconnected from modern development
#3 · Paul Chiusano & Rúnar Bjarnason
Functional Programming in Scala
$44.99
The Scala bible that teaches FP through a production-ready language
- âś“ Balances theory with practical Scala implementation
- âś“ Covers type systems and error handling elegantly
- âś“ Exercises force you to actually understand concepts
- ✗ Scala is niche—knowledge doesn't transfer as broadly
- âś— Steep learning curve if unfamiliar with static typing
- âś— Somewhat verbose for quick reference
#4 · Allen & Moronuki · Hidden Gem
Haskell Programming from First Principles
$49.99
Learn pure functional programming from experts who actually explain why it matters
- âś“ Most comprehensive Haskell resource for beginners
- âś“ Philosophical grounding in why FP principles exist
- âś“ Rigorous treatment of monads and type classes
- ✗ Haskell is academic—rarely used in industry
- âś— Very long (1,244 pages) and time-intensive
- âś— Can feel overly theoretical for practical developers
#5 · Brian Lonsdorf · Best Value
Mostly Adequate Guide to Functional Programming
$0 (Free Online)
Accessible, free, and actually fun—perfect for JavaScript developers dipping their toes in
- âś“ Completely free and open source
- âś“ Fun, illustrative writing style with visual concepts
- âś“ JavaScript-based with real-world examples
- âś— Less rigorous than paid alternatives
- âś— Incomplete in some sections
- âś— Skips deeper mathematical foundations