Data.Maybe.Last

newtype Last a

Monoid returning the last (right-most) non-Nothing value.

Last (Just x) <> Last (Just y) == Last (Just y)
Last (Just x) <> Last Nothing == Last (Just x)
Last Nothing <> Last Nothing == Last Nothing
mempty :: Last _ == Last Nothing

Constructors

• Last (Maybe a)

Instances

• Newtype (Last a) _
• (Eq a) => Eq (Last a)
• Eq1 Last
• (Ord a) => Ord (Last a)
• Ord1 Last
• (Bounded a) => Bounded (Last a)
• Functor Last
• Invariant Last
• Apply Last
• Applicative Last
• Bind Last
• Monad Last
• Extend Last
• (Show a) => Show (Last a)
• Semigroup (Last a)
• Monoid (Last a)
• Alt Last
• Plus Last
• Alternative Last
• MonadZero Last