map -package:text -package:bytestring -package:blaze-html -package:insert-ordered-containers -package:ghc -package:basement -package:conduit -package:incipit-base -package:monoidal-containers -package:dense-linear-algebra -package:filepath -package:os-string -package:unordered-containers -package:charset -package:base -package:Cabal-syntax -package:integration -package:containers 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