March 14, 2014
Moderately. I actually started playing with the language way, way back in the 90s -- I wrote much of a DARPA bid to build a hypermedia system in Haskell. (Which turned into an educational MUD system written in ADA and Moo -- such are the ways of DARPA.) I haven't done anything real with Haskell, but my focus has been getting more and more functional over the years -- even in C#, I usually teach functional paradigms to the junior programmers. And my current project involves crafting a rather peculiar and streamlined pure-functional language.
It's the language that has taken functional programming most seriously and furthest, far as I can tell. Regardless of whether I'm using it directly, I clearly want to be poaching ideas from it.
Lifelong programmer, currently bootstrapping a Scala-stack startup.