map -package:containers -package:charset is:exact -package:insert-ordered-containers -package:foldl -package:ghc -package:bytestring -package:aeson -package:basement -package:conduit -package:os-string -package:text package:unordered-containers
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])
HashSet.fromList ["1","2","3"]