如何从Dart（Dartz）中的任一类型轻松提取Left或Right

好的，这里是我的问题的解决方案：

提取/检索数据

final Either<ServerException, TokenModel> result = await repository.getToken(...);result.fold( (exception) => DoWhatYouWantWithException,  (tokenModel) => DoWhatYouWantWithModel);//Other way to 'extract' the dataif (result.isRight()) {  final TokenModel tokenModel = result.getOrElse(null);}

测试异常

//You can extract it from below, or test it directly with the typeexpect(() => result, throwsA(isInstanceOf<ServerException>()));