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Add map function #32

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Add map function #32

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8 changes: 7 additions & 1 deletion src/Data/NonEmpty.purs
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Expand Up @@ -27,6 +27,7 @@ import Data.Ord (class Ord1, compare1)
import Data.Semigroup.Foldable as F1
import Data.Traversable (class Traversable, traverse, sequence)
import Data.TraversableWithIndex (class TraversableWithIndex, traverseWithIndex)
import Prelude as Prelude

-- | A non-empty container of elements of type a.
-- |
Expand Down Expand Up @@ -71,6 +72,11 @@ head (x :| _) = x
tail :: forall f a. NonEmpty f a -> f a
tail (_ :| xs) = xs

-- | Useful for functorish non-functors like `Set`.
-- > NonEmpty.map Set.map (_ + 1)
map :: forall a b f. ((a -> b) -> f a -> f b) -> (a -> b) -> NonEmpty f a -> NonEmpty f b
map mapper f (a :| as) = (f a :| mapper f as)

instance showNonEmpty :: (Show a, Show (f a)) => Show (NonEmpty f a) where
show (a :| fa) = "(NonEmpty " <> show a <> " " <> show fa <> ")"

Expand All @@ -90,7 +96,7 @@ instance ord1NonEmpty :: Ord1 f => Ord1 (NonEmpty f) where
c -> c

instance functorNonEmpty :: Functor f => Functor (NonEmpty f) where
map f (a :| fa) = f a :| map f fa
map f (a :| fa) = f a :| Prelude.map f fa

instance functorWithIndex
:: FunctorWithIndex i f
Expand Down