| // 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 correct value is returned. |
| /// @author ngl@unipro.ru |
| |
| |
| import "dart:typed_data"; |
| import "../../../Utils/expect.dart"; |
| |
| Float64x2 f64x2(v) => new Float64x2.splat(v); |
| |
| checkDouble(List<Float64x2> list, double expected) { |
| var l = new Float64x2List.fromList(list); |
| var res = l.fold(0, (num prev, cur) => prev + cur.x + cur.y); |
| Expect.equals(expected, res); |
| } |
| |
| checkString(List<Float64x2> list, String expected) { |
| var l = new Float64x2List.fromList(list); |
| var res = l.fold("res", (prev, cur) => "${prev} ${cur.x + cur.y}"); |
| Expect.equals(expected, res); |
| } |
| |
| checkConst(List<Float64x2> list, int expected) { |
| var l = new Float64x2List.fromList(list); |
| var res = l.fold(0, (prev, cur) => 11); |
| Expect.equals(expected, res); |
| } |
| |
| main() { |
| checkDouble([], 0.0); |
| checkDouble([f64x2(1.0), f64x2(2.0)], 6.0); |
| checkDouble([f64x2(1.0), f64x2(3.0), f64x2(5.0), f64x2(7.0), f64x2(9.0)], |
| 50.0); |
| |
| checkString([], "res"); |
| checkString([f64x2(1.1), f64x2(2.1)], "res 2.2 4.2"); |
| checkString([f64x2(1.1), f64x2(3.1), f64x2(5.1), f64x2(7.1), f64x2(9.1)], |
| "res 2.2 6.2 10.2 14.2 18.2"); |
| |
| checkConst([], 0); |
| checkConst([f64x2(1.0), f64x2(2.0)], 11); |
| checkConst([f64x2(1.0), f64x2(3.0), f64x2(5.0), f64x2(7.0), f64x2(9.0)], 11); |
| } |