zipWith package:ghc

When a key is found in both maps, apply a function to the key and values to produce an action and use its result in the merged map.

When a key is found in both maps, apply a function to the key and values and use the result in the merged map.

zipWithMatched
:: (Key -> x -> y -> z)
-> SimpleWhenMatched x y z

When a key is found in both maps, apply a function to the key and values, perform the resulting action, and maybe use the result in the merged map. This is the fundamental WhenMatched tactic.

When a key is found in both maps, apply a function to the key and values and maybe use the result in the merged map.

zipWithMaybeMatched
:: (Key -> x -> y -> Maybe z)
-> SimpleWhenMatched x y z

zipWith3M for NonEmpty lists.

stretchZipWith p z f xs ys stretches ys by inserting z in the places where p returns True