map -package:containers -package:insert-ordered-containers -package:dense-linear-algebra -package:invertible -package:bytestring -package:conduit -package:integration -package:basement -package:psqueues -package:foldl -package:regex-tdfa -package:aeson -package:case-insensitive -package:unordered-containers -package:ghc -package:os-string -package:text 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