BMFTransitRouteResult.fromMap constructor Null safety

Implementation

BMFTransitRouteResult.fromMap(Map map)
    : assert(
          map != null, // ignore: unnecessary_null_comparison
          'Construct a BMFTransitRouteResult，The parameter map cannot be null !') {
  taxiInfo =
      map['taxiInfo'] == null ? null : BMFTaxiInfo.fromMap(map['taxiInfo']);
  suggestAddrResult = map['suggestAddrResult'] == null
      ? null
      : BMFSuggestAddrInfo.fromMap(map['suggestAddrResult']);
  if (map['routes'] != null) {
    List<BMFTransitRouteLine> tmpRoutes = [];
    map['routes'].forEach((v) {
      tmpRoutes.add(BMFTransitRouteLine.fromMap(v as Map));
    });
    routes = tmpRoutes;
  }
}