| /* |
| * 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 dynamic fold(initialValue, combine(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. |
| * Use initialValue as the initial value, and the function combine |
| * to create a new value from the previous one and an element. |
| * @description Checks that the returned value is correct. |
| * @author msyabro |
| */ |
| import "dart:typed_data"; |
| import "../../../Utils/expect.dart"; |
| |
| checkInt(list, expected) { |
| var l = new Float64List.fromList(list); |
| var res = l.fold(0, (prev, cur) => prev + cur); |
| Expect.equals(expected, res); |
| } |
| |
| checkString(list, expected) { |
| var l = new Float64List.fromList(list); |
| var res = l.fold("", (prev, cur) => "${prev}${cur}"); |
| Expect.equals(expected, res); |
| } |
| |
| checkConst(list, expected) { |
| var l = new Float64List.fromList(list); |
| var res = l.fold(0, (prev, cur) => 1); |
| Expect.equals(expected, res); |
| } |
| |
| |
| main() { |
| checkInt([], 0); |
| checkInt([1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0], 55.0); |
| checkInt([10.0, -1.0, -2.0, -3.0, -4.0], 0.0); |
| |
| checkString([], ""); |
| checkString([1.0], "1.0"); |
| checkString([1.0, 2.0, 3.0, 4.0, 5.0], "1.02.03.04.05.0"); |
| |
| checkConst([], 0); |
| checkConst([1.0, 2.0, 3.0], 1); |
| } |