| /* |
| * 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 this stream ends without finding a match and a |
| * defaultValue function is provided, the result of calling [orElse] becomes |
| * the value of the future. |
| * @author kaigorodov |
| */ |
| library lastWhere_A02_t01; |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| void check<T>(Stream<T> s, bool test(T element), Object expected) { |
| AsyncExpect.value(expected, s.lastWhere(test, orElse: () => expected)); |
| } |
| |
| void test(CreateStreamFunction create) { |
| check(create([]), (element) => true, 1); |
| check(create([1, 2, 3]), (int element) => element == null, null); |
| check(create(new Iterable.generate(0, (int index) => index)), |
| (int element) => false, 0); |
| check(create(new Iterable.generate(0, (int index) => index)), |
| (int element) => true, 0); |
| check(create(new Iterable.generate(10, (int index) => index)), |
| (int element) => false, 22); |
| check(create(new Iterable.generate(10, (int index) => index * 5)), |
| (int element) => element < 0, 33); |
| } |