map -package:containers -package:insert-ordered-containers -package:ghc -package:invertible -package:base-compat-batteries -package:basement -package:os-string -package:dlist -package:hedgehog -package:aeson -package:foldl -package:bytestring -package:amazonka-core -package:monoidal-containers -package:filepath -package:vector package:vector-stream -is:exact

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