toString method

@override String toString()

A string representation of this object.

Some classes have a default textual representation, often paired with a static parse function (like int.parse). These classes will provide the textual representation as their string representation.

Other classes have no meaningful textual representation that a program will care about. Such classes will typically override toString to provide useful information when inspecting the object, mainly for debugging or logging.

Implementation

@override
String toString() {
  Map<String, dynamic> obj = {
    'provinceName': provinceName,
    'provinceId': provinceId,
    'cityName': cityName,
    'cityId': cityId,
    'areaName': areaName,
    'areaId': areaId
  };
  obj.removeWhere((key, value) => value == null);

  return json.encode(obj);
}