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ethagnawl/bind-confusion.hs

Created May 10, 2017 16:47
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bind type confusion
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bind-confusion.hs
-- (>>=) :: Monad m => m a -> (a -> m b) -> m b
-- why are `a` and `b` different? i guess that signature means
-- they _can_ be but don't _need_ to be.
Just 5 >>= (\a -> Just (10 + a)) -- Just 15
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