Glad you asked! I did this in about 7 minutes, but I could spend a week talking about how lispers, ML, clojure scala and haskell approach this. http://www.reddit.com/r/haskell/comments/qxmh3/what_are_some...

http://stackoverflow.com/questions/tagged/functional-program...

esp this one (Harrop, Ramsey, Brian are FP heavyweights

http://stackoverflow.com/questions/485418/distinctive-traits...