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<oerjan> learn A zygohistomorphic prepromorphism is used when you really need both semi-mutual recursion and history and to repeatedly apply a natural transformation as you get deeper into the functor.
author | HackBot |
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date | Sat, 11 Apr 2015 23:58:23 +0000 |
parents | e037173e0012 |
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2009-06-24.txt:19:07:27: <oerjan> also i have seen so few applicatives that aren't usually extended right on to monads, the only one coming to mind is ZipList (and i recall concluding even those _had_ a monad extension in principle) 2009-06-24.txt:19:08:39: <Gracenotes> ZipList is mah canonical example 2009-06-24.txt:19:28:12: <oerjan> augur: i'm talking about a theoretical Monad instance for ZipList, lambdabot doesn't have it 2009-06-26.txt:05:30:49: <pikhq> > fromZipList $ fmap chr $ (+) <$> (fmap ord ['