map -package:containers -package:basement -package:psqueues -package:Cabal-syntax -package:incipit-base -package:monoidal-containers -package:pipes -package:os-string -package:filepath -package:conduit -package:regex-tdfa -package:vector package:vector-stream
Map a monadic function over a
Stream
Execute a monadic action for each element of the
Stream
Apply monadic function to each element and drop all Nothings