I had the opposite experience with learning J. After a couple of days meditating about concept of rank (here is the most relevant part of the excellent book - h

I had the opposite experience with learning J. After a couple of days meditating about concept of rank (here is the most relevant part of the excellent book - http://www.jsoftware.com/help/jforc/declarations.htm#_Toc191734321 http://www.jsoftware.com/help/jforc/declarations.htm#_Toc191...) it went much easier. On the other hand, with Haskell I can even write monads myself now, but I hardly see their usefulness yet.