getRegions method

@override Future<List<Region>?> getRegions([ String? regionId ])

The function getRegions retrieves a list of regions from a method channel and converts the JSON response into a list of Region objects. @param {String} regionId - The regionId parameter is an optional parameter of type String. It is used to specify a specific region ID for which you want to retrieve the regions. If regionId is not provided, the method will retrieve all regions. @returns The method is returning a Future object that resolves to a List of Region objects.

Implementation

@override
Future<List<Region>?> getRegions([String? regionId]) async {
  final returnVal =
      await methodChannel.invokeMethod<String>('getRegions', regionId);
  List<Region>? regions = [];
  if (returnVal != null) {
    regions = (jsonDecode(returnVal) as List)
        .map((i) => Region.jsonToObj(i))
        .toList();
  }
  return regions;
}