insert module:Data.Set is:exact -package:linear-base -package:set-monad -package:multimap

insert :: Ord a => a -> Set a -> Set a
containers Data.Set Data.Set.Internal
Insert an element in a set. If the set already contains an element equal to the given value, it is replaced with the new value.
insert :: Ord a => a -> NESet a -> NESet a
nonempty-containers Data.Set.NonEmpty
O(log n). Insert an element in a set. If the set already contains an element equal to the given value, it is replaced with the new value.