map -package:containers -package:bytestring -package:monoidal-containers -package:charset -package:psqueues -package:conduit -package:base-prelude -package:basement -package:text -package:base-compat-batteries -package:unordered-containers -package:case-insensitive -package:filepath -package:dlist -package:amazonka-core -package:hedgehog -package:regex-tdfa 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