map -package:Cabal -package:base -package:text -package:pipes -package:containers -package:regex-tdfa -package:bytestring package:unordered-containers is:exact
Transform this map by applying a function to every value.
Transform this set by applying a function to every value.
The resulting set may be smaller than the source.
>>> HashSet.map show (HashSet.fromList [1,2,3])