map -package:containers -package:bytestring -package:Cabal-syntax -package:basement -package:conduit -package:base -package:ghc -package:insert-ordered-containers -package:charset -package:aeson -package:pipes -package:text -package:unordered-containers -package:vector package:vector-stream

Map a function over a 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