| // 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> reduce(T combine(T previous, T element)) |
| /// Reduces a sequence of values by repeatedly applying combine. |
| /// @description Checks that the combine method is not called for the first |
| /// element in stream. |
| /// @author a.semenov@unipro.ru |
| |
| library reduce_A01_t04; |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| void test(CreateStreamFunction create) { |
| List<int> log = []; |
| |
| int combine(int p, int e) { |
| log.add(p); |
| log.add(e); |
| return p + e; |
| } |
| |
| Stream<int> s = create([1, 2, 3, 4]); |
| asyncStart(); |
| s.reduce(combine).then( |
| (value) { |
| Expect.equals(10, value); |
| Expect.listEquals([1, 2, 3, 3, 6, 4], log); |
| asyncEnd(); |
| } |
| ); |
| } |