Dart construct API request URL with default GET params

main.dart

main() {
  Map <String, String> args = {'filter_visibility' : 'false' };
  

  print( getMediaAssetCollectionArgs( args ) );
 
  print( getRequestURi( getMediaAssetCollectionArgs( args ) ) );
}

Map getMediaAssetCollectionArgs( Map args ) {
  Map <String, String> defaults = { 'filter_playability' : 'true' };
  Map <String, String> combined = {};

  combined.addAll( defaults );
  combined.addAll( args );

  return combined;
}

String getRequestURi( Map<String, String> args ) { 
  Uri uri = new Uri(
      scheme: 'https',
      host: 'localhost',
      port: 8080,
      path: 'myapp',
      queryParameters: args
  );
  
  return uri.toString();
}