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Change foldM type signature to more closely match foldl #111

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Oct 15, 2020
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Change foldM type signature to more closely match foldl #111

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4 changes: 2 additions & 2 deletions src/Data/Foldable.purs
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Expand Up @@ -177,8 +177,8 @@ fold = foldMap identity
-- |
-- | Note: this function is not generally stack-safe, e.g., for monads which
-- | build up thunks a la `Eff`.
foldM :: forall f m a b. Foldable f => Monad m => (a -> b -> m a) -> a -> f b -> m a
foldM f a0 = foldl (\ma b -> ma >>= flip f b) (pure a0)
foldM :: forall f m a b. Foldable f => Monad m => (b -> a -> m b) -> b -> f a -> m b
foldM f b0 = foldl (\b a -> b >>= flip f a) (pure b0)

-- | Traverse a data structure, performing some effects encoded by an
-- | `Applicative` functor at each value, ignoring the final result.
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