Proposal: Add `restriction` to Data.Map and Data.IntMap

[Joachim Breitner]

Hi,

Am Donnerstag, den 14.07.2016, 00:45 -0400 schrieb David Feuer:
> Data.IntMap.restriction :: IntSet -> IntMap a -> IntMap a
> Data.Map.restriction :: Ord k => Set k -> Map k a -> Map k a
> 
> In each case, the map is filtered to contain only the keys that are
> also found in the set. This can be implemented efficiently using a
> slightly stripped-down version of Data.Map.intersection.

+1

I believe I needed that in the past.

Joachim
-- 

Joachim “nomeata” Breitner
  mail at joachim-breitner.de • https://www.joachim-breitner.de/
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  Debian Developer: nomeata at debian.org
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