map -package:containers -package:imports -package:dense-linear-algebra -package:basement -package:base-prelude -package:aeson -package:bytestring -package:insert-ordered-containers -package:monoidal-containers -package:conduit -package:regex-tdfa -package:os-string -package:amazonka-core -package:unordered-containers -package:vector -package:invertible 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