Get started with Bluefin by Tom Ellis #FnConf 2025

Tom Ellis introduces Bluefin, a Haskell effect system that represents effects using value-level handles rather than type-level signatures.

Bluefin is a new effect system for Haskell which provides a simple interface to composable and efficient effects. Unlike existing effect systems, it represents effects by value-level "handles" or "capabilities", not at the type level. This short tutorial will show you how to get comfortable and write your first programs with Bluefin. More details: confengine.com/conferences/functional-conf-2025/proposal/212… Conference Link: functionalconf.com