map -package:containers -package:base-prelude -package:basement -package:aeson -package:amazonka-core -package:foldl -package:ghc -package:charset -package:conduit -package:monoidal-containers -package:psqueues -package:text -package:hedgehog -package:Cabal-syntax -package:vector -package:filepath 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