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Add hmap #31

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Add hmap 
Useful for changing the type of the underlying collection.
The 'h' in "hmap" is for higher-order.
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@colehaus
colehaus committed Apr 8, 2018
commit 21108b5eba3ce1e6ca07ed92b54ef9fdd1af65fb
3 changes: 3 additions & 0 deletions src/Data/NonEmpty.purs
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Expand Up @@ -71,6 +71,9 @@ head (x :| _) = x
tail :: forall f a. NonEmpty f a -> f a
tail (_ :| xs) = xs

hmap :: forall f g. (f ~> g) -> NonEmpty f ~> NonEmpty g
hmap f (a :| as) = (a :| f as)

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

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