[Haskell-beginners] a problem with maps

[Ertugrul Soeylemez]

Dennis Raddle <dennis.raddle at gmail.com> wrote:

> Another problem is have is to filter entries in a map. If I have a map
>
> Ord k => Map k [a]
>
> (essentially, which combines data with the same key into a list)
>
> and I have a predicte (k,a) -> Bool
>
> (which takes the key and one element in its list and checks it)
>
> and I need to regenerate the map, what would be a good way to do that?

See the foldWithKey function in Data.Map.


Greets,
Ertugrul


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