| // 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 with |
| /// no [orElse] function provided, the future will receive an error. |
| /// @author kaigorodov |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| import "IsolateStream.dart" as IsolateStream; |
| |
| check(Iterable data, bool test(var element)) { |
| Stream s = IsolateStream.fromIterable(data); |
| asyncStart(); |
| s.lastWhere(test).then((data) { |
| Expect.fail("data passed: $data"); |
| }, onError: (error) { |
| Expect.isTrue(error is Error); |
| asyncEnd(); |
| }); |
| } |
| |
| main() { |
| check([], (var element) => true); |
| check([1, 2, 3], (var element) => element == null); |
| check([null, null], (var element) => element != null); |
| check(new Iterable.generate(0, (int index) => index), (var element) => false); |
| check( |
| new Iterable.generate(10, (int index) => index), (var element) => false); |
| check(new Iterable.generate(10, (int index) => index * 5), |
| (var element) => element < 0); |
| check(new Iterable.generate(10, (int index) => index * 5), |
| (var element) => element == 300); |
| } |