map -package:containers -package:case-insensitive -package:aeson -package:dlist -package:basement -package:conduit -package:pipes -package:filepath -package:imports -package:bytestring -package:invertible -package:ghc -package:psqueues -package:text -package:amazonka-core -package:dense-linear-algebra -package:base-compat -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