maximumBy is:exact

maximumBy :: Foldable t => (a -> a -> Ordering) -> t a -> a

base Data.List Data.Foldable

The largest element of a non-empty structure with respect to the given comparison function. Structure order is used as a tie-breaker: if there are multiple largest elements, the rightmost of them is chosen.

Examples

Basic usage:

>>> maximumBy (compare `on` length) ["Hello", "World", "!", "Longest", "bar"]
"Longest"

WARNING: This function is partial for possibly-empty structures like lists.

maximumBy :: Foldable1 t => (a -> a -> Ordering) -> t a -> a

base Data.Foldable1

The largest element of a non-empty structure with respect to the given comparison function. Structure order is used as a tie-breaker: if there are multiple largest elements, the rightmost of them is chosen.

maximumBy :: (a -> a -> Ordering) -> Vector a -> a

vector Data.Vector Data.Vector.Strict

O(n) Yield the maximum element of the vector according to the given comparison function. The vector may not be empty. In case of a tie, the first occurrence wins. This behavior is different from maximumBy which returns the last tie.

Examples

>>> import Data.Ord

>>> import qualified Data.Vector as V

>>> V.maximumBy (comparing fst) $ V.fromList [(2,'a'), (1,'b')]
(2,'a')

>>> V.maximumBy (comparing fst) $ V.fromList [(1,'a'), (1,'b')]
(1,'a')

maximumBy :: Vector v a => (a -> a -> Ordering) -> v a -> a

vector Data.Vector.Generic

O(n) Yield the maximum element of the vector according to the given comparison function. The vector may not be empty. In case of a tie, the first occurrence wins. This behavior is different from maximumBy which returns the last tie.

Examples

>>> import Data.Ord

>>> import qualified Data.Vector.Strict as V

>>> V.maximumBy (comparing fst) $ V.fromList [(2,'a'), (1,'b')]
(2,'a')

>>> V.maximumBy (comparing fst) $ V.fromList [(1,'a'), (1,'b')]
(1,'a')

maximumBy :: Prim a => (a -> a -> Ordering) -> Vector a -> a

vector Data.Vector.Primitive

O(n) Yield the maximum element of the vector according to the given comparison function. The vector may not be empty. In case of a tie, the first occurrence wins. This behavior is different from maximumBy which returns the last tie.

maximumBy :: Storable a => (a -> a -> Ordering) -> Vector a -> a

vector Data.Vector.Storable

O(n) Yield the maximum element of the vector according to the given comparison function. The vector may not be empty. In case of a tie, the first occurrence wins. This behavior is different from maximumBy which returns the last tie.

maximumBy :: Unbox a => (a -> a -> Ordering) -> Vector a -> a

vector Data.Vector.Unboxed

O(n) Yield the maximum element of the vector according to the given comparison function. The vector may not be empty. In case of a tie, the first occurrence wins. This behavior is different from maximumBy which returns the last tie.

Examples

>>> import Data.Ord

>>> import qualified Data.Vector.Unboxed as VU

>>> VU.maximumBy (comparing fst) $ VU.fromList [(2,'a'), (1 :: Int,'b')]
(2,'a')

>>> VU.maximumBy (comparing fst) $ VU.fromList [(1,'a'), (1 :: Int,'b')]
(1,'a')