Function SliceLength

x/errors/validation/slice.go:40–58

SliceLength accepts any slice and returns a message if the length is not in the given range.

(min, max int)

// SliceLength accepts any slice and returns a message if the length is not in the given range.
func SliceLength[T any, V SliceType[T]](min, max int) func(s V) string {
	return func(s V) string {
		n := len(s)

		if min == max {
			if n != min {
				return fmt.Sprintf("must be %d elements", min)
			}

			return ""
		}

		if n < min || n > max {
			return fmt.Sprintf("must be between %d and %d elements", min, max)
		}

		return ""
	}
}