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hadronized/Selective.hs

Created March 7, 2019 13:38
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Selective.hs
-- Why not this implementation?
selectM :: (Monad f) => f (Either a b) -> f (a -> b) -> f b
selectM x y = do
e <- x
case e of
Left a -> fmap ($a) y
Right b -> fmap (const b) y
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