map -package:containers -package:dlist -package:conduit -package:basement -package:Cabal-syntax -package:aeson -package:os-string -package:monoidal-containers -package:insert-ordered-containers -package:unordered-containers -package:vector 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