Yes! intersectionWith is just what I needed.
In any case, coming back to your example, why would
you want to use undefined in that particular case?
What makes it an interesting example ?
Best,
Jose
On 28-05-2013 12:32, Johannes Waldmann wrote:
Jose A. Lopes <jose.lopes <at> ist.utl.pt> writes:
unionWith :: Ord k => (a -> b -> c) -> Map k a -> Map
k b -> Map k c
what should be the result of
unionWith undefined (M.singleton False 42) (M.singleton True "bar") ?
perhaps you mean intersectionWith, which already has the type you want.
- J.W.
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José António Branquinho de Oliveira Lopes
Instituto Superior Técnico
Technical University of Lisbon
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