| /* |
| * Copyright (c) 2013, 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 T fold<T>(T initialValue, T combine(T previousValue, E element)) |
| * Reduces a collection to a single value by iteratively combining each element |
| * of the collection with an existing value using the provided function. |
| * Uses initialValue as the initial value, then iterates through the elements |
| * and updates the value with each element using the combine function. |
| * @description Checks that the returned value is correct. |
| * @author msyabro |
| */ |
| |
| import "dart:typed_data"; |
| import "../../../Utils/expect.dart"; |
| |
| checkInt(List<int> list, int expected) { |
| var l = new Int8List.fromList(list); |
| var res = l.fold(0, (prev, cur) => prev + cur); |
| Expect.equals(expected, res); |
| } |
| |
| checkString(List<int> list, String expected) { |
| var l = new Int8List.fromList(list); |
| var res = l.fold("", (prev, cur) => "${prev}${cur}"); |
| Expect.equals(expected, res); |
| } |
| |
| checkConst(List<int> list, int expected) { |
| var l = new Int8List.fromList(list); |
| var res = l.fold(0, (prev, cur) => 1); |
| Expect.equals(expected, res); |
| } |
| |
| |
| main() { |
| checkInt([], 0); |
| checkInt([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 55); |
| checkInt([10, -1, -2, -3, -4], 0); |
| |
| checkString([], ""); |
| checkString([1], "1"); |
| checkString([1, 2, 3, 4, 5], "12345"); |
| |
| checkConst([], 0); |
| checkConst([1, 2, 3], 1); |
| } |