unionWith package:bytestring-trie

unionWith :: (a -> a -> a) -> Trie a -> Trie a -> Trie a
bytestring-trie Data.Trie.Convenience
Take the union of two tries, using a function to resolve conflicts. The resulting trie is constructed strictly, but the results of the combining function are evaluated lazily.
unionWith' :: (a -> a -> a) -> Trie a -> Trie a -> Trie a
bytestring-trie Data.Trie.Convenience
A variant of unionWith which evaluates the combining function strictly.
wip_unionWith :: (a -> a -> a) -> Trie a -> Trie a -> Trie a
bytestring-trie Data.Trie.Internal
Take the union of two tries, using a function to resolve conflicts. The resulting trie is constructed strictly, but the results of the combining function are evaluated lazily.