Data.Map lacks unionsWithKey

[nomeata]

Hi,

I currently see

union :: Ord k => Map k a -> Map k a -> Map k a
unionWith :: Ord k => (a -> a -> a) -> Map k a -> Map k a -> Map k a
unionWithKey :: Ord k => (k -> a -> a -> a) -> Map k a -> Map k a -> Map k a
unions :: Ord k => [Map k a] -> Map k a
unionsWith :: Ord k => (a -> a -> a) -> [Map k a] -> Map k a

so it would be only consistent to have a

unionsWithKey :: Ord k => (k -> a -> a -> a) -> [Map k a] -> Map k a

as well.

[sjakobi]

unionsWith :: Ord k => (a -> a -> a) -> [Map k a] -> Map k a

This one appears to be gone?!

Here are some slightly related discussions on unordered-containers: haskell-unordered-containers/unordered-containers#240, haskell-unordered-containers/unordered-containers#118

[sjakobi]

unionsWith :: Ord k => (a -> a -> a) -> [Map k a] -> Map k a

This one appears to be gone?!

Not sure why I missed this. We have

unionsWith :: (Foldable f, Ord k) => (a -> a -> a) -> f (Map k a) -> Map k a

today.