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jfischoff/delayOne.hs

Created August 21, 2019 06:04
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delayOne.hs
delayOne :: (MonadHold t m, Reflex t) => Event t a -> m (Event t (a, a))
delayOne e = do
b <- hold Nothing $ Just <$> e
let eOld = W.catMaybes $ b <@ e
pure $ liftF2 (,) eOld e
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