map -package:Cabal -package:base -package:case-insensitive -package:blaze-html -is:exact -package:aeson is:exact 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])