main function
void
main()
Implementation
void main() async {
List<MultiPolygonField> multiPolygonFields = [];
final jsonData = await File('./multipolygon.json').readAsString().then((fileContents) => json.decode(fileContents));
for (var elem in jsonData) {
multiPolygonFields.add(MultiPolygonField.fromJson(Map<String, dynamic>.from(elem)));
}
print(multiPolygonFields);
}