| // Copyright (c) 2011, 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. |
| |
| // @dart = 2.9 |
| |
| /// @assertion Stream transform(StreamTransformer<T, dynamic> streamTransformer) |
| /// Chains this stream as the input of the provided StreamTransformer. |
| /// Returns the result of streamTransformer.bind itself. |
| /// @description Checks that data events are produced according to transform. |
| /// @author ilya |
| |
| library transform_A01_t02; |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| List<int> input = [1, 2, 3, 4, 5]; |
| List<int> expected = [1, 2, 3, 6, 5, 10]; |
| |
| // transform: skip evens, produce number and its double |
| StreamTransformer<int, int> createMyTransformer() { |
| return new StreamTransformer.fromHandlers ( |
| handleData: (int event, EventSink<int> sink) { |
| if (event.isOdd) { |
| sink.add(event); |
| sink.add(event * 2); |
| } |
| } |
| ); |
| } |
| |
| void test(CreateStreamFunction create) { |
| AsyncExpect.data(expected, create(input).transform(createMyTransformer())); |
| } |