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Add Control.Foldl.NonEmpty.nonEmpty #186

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Nov 28, 2022
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Add Control.Foldl.NonEmpty.nonEmpty #186

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5 changes: 5 additions & 0 deletions src/Control/Foldl/NonEmpty.hs
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Expand Up @@ -155,6 +155,11 @@ fromFold :: Fold a b -> Fold1 a b
fromFold (Fold step begin done) = Fold1 (\a -> Fold step (step begin a) done)
{-# INLINABLE fromFold #-}

-- | Fold all values within a non-empty container into a `NonEmpty` list
nonEmpty :: Fold1 a (NonEmpty a)
nonEmpty = Fold1 (\a -> fmap (a :|) Foldl.list)
{-# INLINEABLE nonEmpty #-}

-- | Fold all values within a non-empty container using (`<>`)
sconcat :: Semigroup a => Fold1 a a
sconcat = Fold1 (\begin -> Fold (<>) begin id)
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