mobile static method

String? mobile(
  1. String value, {
  2. int length = 10,
})

Implementation

static String? mobile(String value,{int length=10}) {
  if (value.isEmpty) {
    return 'Mobile number cannot be  empty.';
  } else if (value.length < length) {
    return 'Number must be $length digits long.';
  } else if (value.length > length) {
    return 'Number must be $length digits long.';
  }
  return null;
}