Haskell took me a while, because there weren't many great resources on how to write many kinds of "real" code in Haskell. The quality of material is getting ste

Haskell took me a while, because there weren't many great resources on how to write many kinds of "real" code in Haskell. The quality of material is getting steadily better. I think you've got a good 6-12 months before Haskell is more productive for you than OCaml or a C/Python/Lua stack. If you're coming from Java, you're more productive than you were at 1 month in Haskell (you still know very little Haskell, but you're pwning your former Java-toting self)... but in your case, you already know quite a few high-level languages. So it's not surprising that you get less done in a language that forces you to contend with monads (which aren't as hard as they're made out to be, but they're one more new concept) just to have state. If you're coming from Java, you're more productive in Haskell almost instantaneously, before you really even know it. If you're coming from Python, you're less productive day-by-day because the compiler keeps burning you, but you find long-term development going faster due to fewer code breakages. If you're coming from Ocaml... the short answer is that they're both great languages with more in common than not (although I prefer Haskell) so it's not surprising that it takes a while to get up to your prior speed (because your prior speed is so much higher than that of someone from Java). Real World Haskell is a good book, though a bit slow and dated. Learn You a Haskell is a decent intro book but it has some gaps. I'm working on a Summer Haskell Course at my company and will be publishing the slides. And Chris Allen recommends the CS 194 course that Penn offers (you can find it online). Resources are out there.