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Books

Best Books on Functional Programming

Master immutable data, pure functions, and elegant code

Functional programming isn't a trend—it's how serious developers write maintainable code. Start with Composing Software if you want practical wisdom.

👑 #1 Pick

Composing Software: An Exploration of Functional Programming and Object Composition in JavaScript

The most practical guide to functional programming for JavaScript developers—no academic fluff

All 5 recommendations

Est. prices as of 21 Mar 2026

#1 · Eric Elliott · Crowd Favorite

Composing Software: An Exploration of Functional Programming and Object Composition in JavaScript

$29.99

The most practical guide to functional programming for JavaScript developers—no academic fluff

✓ Real-world JavaScript examples you can use immediately
✓ Bridges functional and OOP paradigms beautifully
✓ Affordable and packed with actionable insights

✗ JavaScript-focused, so less useful if you code in other languages

#2 · Paul Chiusano & Rúnar Bjarnason · Premium Pick

Functional Programming in Scala

$49.99

The definitive deep-dive into functional programming concepts with Scala as your vehicle

✓ Comprehensive coverage of monads, functors, and advanced concepts
✓ Scala forces you to think functionally—excellent for learning
✓ Exercises build muscle memory for functional patterns

✗ Steep learning curve—assumes some programming maturity
✗ Scala adoption is niche; less immediately applicable than JavaScript books

#3 · Mike Driscoll

Functional Programming in Python

$34.95

Make Python functional without fighting the language's imperative nature

✓ Python developers will recognize familiar tools (map, filter, reduce, lambda)
✓ Practical and approachable
✓ Covers decorators, generators, and functional idioms in Python

✗ Python isn't a true functional language, so some concepts feel forced
✗ Shorter and less comprehensive than competitor books

#4 · Miran Lipovača · Hidden Gem

Learn You a Haskell for Great Good!

$22.99

Pure functional programming explained with humor and hand-drawn illustrations

✓ Haskell forces pure functional thinking—no escaping it
✓ Beautifully written and genuinely fun to read
✓ Best for understanding the mathematical foundations of FP

✗ Haskell is rarely used in production—learning it is more philosophical than practical
✗ Steep initial learning curve with minimal job market payoff

#5 · Daniel P. Friedman & Matthias Felleisen

The Little Schemer

$39.95

Teach yourself to think recursively through elegant Lisp-based puzzles

✓ Unique Socratic teaching method—you figure things out, not just read
✓ Masterclass in recursive thinking and pattern matching
✓ Surprisingly entertaining for a dense technical book

✗ Scheme/Lisp is obsolete for modern development
✗ Very slow pacing—takes patience to work through
✗ Not practical for career advancement