| // 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. |
| |
| /// @assertion Future<T> lastWhere (bool test(T element), |
| /// {@deprecated dynamic defaultValue(), T orElse()}) |
| /// |
| /// Finds the last element in this stream matching test. |
| /// |
| /// If this stream emits an error, the returned future is completed with that |
| /// error, and processing stops. |
| /// |
| /// Otherwise as firstWhere, except that the last matching element is found |
| /// instead of the first. That means that a non-error result cannot be provided |
| /// before this stream is done. |
| /// |
| /// The defaultValue parameter is deprecated, and orElse should be used instead. |
| /// @description Checks that if element is found, it is passed to the resulting |
| /// future. [orElse] is omitted. |
| /// @author a.semenov@unipro.ru |
| |
| library lastWhere_A01_t01; |
| import "../../../Utils/expect.dart"; |
| |
| void test(CreateStreamFunction create) { |
| AsyncExpect.value(3, create([1, 2, 3]).lastWhere((element) => true)); |
| AsyncExpect.value(3, create([1, 2, 3]).lastWhere((int? element) => element != null)); |
| AsyncExpect.value(null, create([1, 2, 3, null]).lastWhere((e) => e == null)); |
| AsyncExpect.value(3, create([1, 2, 3]).lastWhere((element) => element > 0)); |
| AsyncExpect.value( |
| 45, |
| create(new Iterable.generate(10, (int index) => index * 5)) |
| .lastWhere((int element) => element != 30) |
| ); |
| AsyncExpect.value( |
| 30, |
| create(new Iterable.generate(10, (int index) => index * 5)) |
| .lastWhere((int element) => element == 30) |
| ); |
| } |