map -package:containers -package:Cabal-syntax -package:integration -package:conduit -package:basement -package:ghc -package:hedgehog -package:bytestring -package:aeson -package:regex-tdfa -package:invertible -package:blaze-html -package:monoidal-containers -package:charset -package:foldl -package:vector -package:filepath -package:case-insensitive 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