lo/docs/data/core-maxbyerr.md

name, slug, sourceRef, category, subCategory, playUrl, variantHelpers, similarHelpers, position, signatures

name	slug	sourceRef	category	subCategory	playUrl	variantHelpers	similarHelpers	position	signatures
MaxByErr	maxbyerr	find.go#L528	core	find	https://go.dev/play/p/s-63-6_9zqM	core#find#maxbyerr	core#find#maxby core#find#max core#find#maxindex core#find#maxindexby core#find#min core#find#minby core#find#minindex core#find#minindexby	221	func MaxByErr[T any](collection []T, comparison func(a T, b T) (bool, error)) (T, error)

Searches the maximum value of a collection using the given comparison function. Returns zero value and nil error when empty.

If the comparison function returns an error, iteration stops and the error is returned.

type Point struct{ X int }
max, err := lo.MaxByErr([]Point{{1}, {5}, {3}}, func(a, b Point) (bool, error) {
    return a.X > b.X, nil
})
// {5}, <nil>

Example with error:

type Point struct{ X int }
max, err := lo.MaxByErr([]Point{{1}, {5}, {3}}, func(a, b Point) (bool, error) {
    if a.X == 5 {
        return false, fmt.Errorf("cannot compare with 5")
    }
    return a.X > b.X, nil
})
// {1}, error("cannot compare with 5")

Note: the comparison function is inconsistent with most languages, since we use the opposite of the usual convention.

See https://github.com/samber/lo/issues/129