Top Books on Functional Programming
- Domain Modeling Made Functional - Scott Wlaschin - 2018 - Apply FP and DDD together to design business software that's easier to reason about.
- Functional Programming in Scala, 2nd Ed. - Paul Chiusano & Rúnar Bjarnason - 2022 - One of the best “learn FP properly” books: types, purity, and composable design.
- Learn You a Haskell for Great Good! - Miran Lipovača - 2011 - The most fun on-ramp to pure FP thinking — free online.
- Haskell Programming from First Principles - Christopher Allen & Julie Moronuki - 2016 - Rigorous and beginner-friendly: builds deep understanding of types and functional design.
- Category Theory for Programmers - Bartosz Milewski - 2019 - The math foundations behind FP concepts, explained for working programmers — free online.
- Domain-Driven Design - Eric Evans - 2003 - Not an FP book, but pairs extremely well with FP-style modeling of complex domains.