map -package:vector -package:basement -package:conduit -package:case-insensitive -package:dlist -package:aeson -package:Cabal-syntax -package:charset -package:foldl -package:invertible -package:os-string -package:dense-linear-algebra -package:base -package:psqueues -package:insert-ordered-containers -package:monoidal-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