Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/prelude/List/MaximumBy.hs
module List where maximumBy :: (a -> a -> Ordering) -> [a] -> a maximumBy cmp [] = error "List.maximumBy: empty list" maximumBy cmp xs = foldl1 max xs where max x y = case cmp x y of GT -> x _ -> y