| // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| /// @assertion Stream asyncMap(dynamic convert(T event)) |
| /// Creates a new stream with each data event of this stream asynchronously |
| /// mapped to a new event. |
| /// |
| /// This acts like map, except that convert may return a Future, and in that |
| /// case, the stream waits for that future to complete before continuing with |
| /// its result. |
| /// |
| /// Stream<S> map<S>(S convert(T event)) |
| /// ... |
| /// Error and done events are passed through unchanged to the returned stream. |
| /// |
| /// @description Checks that each error thrown by [convert] is passed to returned |
| /// stream. |
| /// @author a.semenov@unipro.ru |
| |
| library asyncMap_A03_t02; |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| void test(CreateStreamFunction create) { |
| Stream<String> stream1 = create(["a", "b", "c"]); |
| AsyncExpect.events([], ["a", "b", "c"], stream1.asyncMap((e) => throw e)); |
| |
| Stream<int> stream2 = create([1, 2, 3, 4, 5]); |
| AsyncExpect.events( |
| [1, 3, 5], // expected data |
| [2, 4], // expected errors |
| stream2.asyncMap((int e) => e.isOdd ? e : throw e) // stream |
| ); |
| } |