map -package:containers -package:dlist -package:conduit -package:basement -package:dense-linear-algebra -package:monoidal-containers -package:blaze-html -package:imports -package:foldl -package:pipes -package:psqueues -package:bytestring -package:charset -package:vector -package:case-insensitive -package:ghc 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