| /* |
| * 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 result is correct. |
| * @author kaigorodov |
| */ |
| |
| import "dart:async"; |
| import "../../../Utils/async_utils.dart"; |
| import "../../../Utils/expect.dart"; |
| |
| void check(Iterable data, combine(previous, var element), var expected) { |
| Stream s=new Stream.fromIterable(data); |
| asyncStart(); |
| Future f=s.reduce(combine); |
| f.then((int actual){ |
| Expect.equals(expected, actual); |
| asyncEnd(); |
| }); |
| } |
| |
| main() { |
| check([1,2,3,4], (int previous, int element)=>previous+element, 10); |
| check([1,2,3,4], (int previous, int element)=>previous*element, 24); |
| } |