22 Jul
2011
22 Jul
'11
11:38 p.m.
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?