max static method

FormFieldValidator<String> max(
  1. int max,
  2. String m
) 
Validatorless.max(4, 'field max 4')

Implementation

static FormFieldValidator<String> max(int max, String m) {
  return (v) {
    if (v?.isEmpty ?? true) return null;
    if ((v?.length ?? 0) > max) return m;
    return null;
  };
}