isMoney function

String? isMoney(String value, num min, num max, { String symbol = "NGN", })

return an error message if value does not pass the validation validation requires val: not equal null and length must be more or equal to 10 characters

Implementation

// ignore: missing_return
String? isMoney(String value, num min, num max, {String symbol = "NGN"}) {
  try {
    if (value.isEmpty) return "must not be less than ${min.toMoney} $symbol";
    final val =
        int.parse(value.substring(0, value.length - 3).replaceAll(",", ""));
    if (val < min) return "must not be less than ${min.toMoney} $symbol";
    if (val > max) return "must not be more than a ${max.toMoney} $symbol";
    return null;
  } catch (e) {
    debugPrint(e.toString());
  }
  return "";
}