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mbloms/coscan.hs

Last active December 16, 2017 13:45
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ComonadScan
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coscan.hs
class Comonad w => ComonadScan w where
scanW :: (a -> w b -> a) -> a -> w b -> w a
scanW f acc w = (duplicate w)
instance ComonadScan Tree where
scanW f acc w@(Node _ as) = let acc' = f acc w in Node acc' (map (scanW f acc') as)
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