| /* |
| * Copyright (c) 2017, 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. |
| * 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 ngl@unipro.ru |
| */ |
| |
| import "dart:typed_data"; |
| import "../../../Utils/expect.dart"; |
| |
| Int32x4 i32x4p(n) => new Int32x4(n, n + 1, n + 2, n + 3); |
| |
| void checkInt(List<Int32x4> list, int expected) { |
| var l = new Int32x4List.fromList(list); |
| var res = l.fold(0, (num prev, cur) => prev + cur.x); |
| Expect.equals(expected, res); |
| } |
| |
| void checkString(List<Int32x4> list, String expected) { |
| var l = new Int32x4List.fromList(list); |
| var res = l.fold("yz", (prev, cur) => "${prev}${cur.y}${cur.z}"); |
| Expect.equals(expected, res); |
| } |
| |
| void checkConst(List<Int32x4> list, int expected) { |
| var l = new Int32x4List.fromList(list); |
| var res = l.fold(2, (prev, cur) => 1); |
| Expect.equals(expected, res); |
| } |
| |
| main() { |
| checkInt([], 0); |
| checkInt([i32x4p(1)], 1); |
| checkInt([i32x4p(1), i32x4p(5), i32x4p(9), i32x4p(13)], 28); |
| |
| checkString([], "yz"); |
| checkString([i32x4p(1)], "yz23"); |
| checkString([i32x4p(1), i32x4p(5), i32x4p(9), i32x4p(13)], "yz236710111415"); |
| |
| checkConst([], 2); |
| checkConst([i32x4p(2)], 1); |
| checkConst([i32x4p(1), i32x4p(5), i32x4p(9), i32x4p(13)], 1); |
| } |