cattleSlaveLesson method

String? cattleSlaveLesson(
  1. String? text
)

Implementation

String? cattleSlaveLesson(String? text) {
  if (text == null || text.isEmpty) {
    return 'Email address is required';
  }
  if (!text.isEmail) {
    return 'Has to be a valid email address.';
  }
  return null;
}