| // 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 "../../../Utils/expect.dart"; |
| |
| checkInt(string, expected) { |
| var runes = new Runes(string); |
| var res = runes.fold(0, (int prev, int cur) => prev + cur); |
| Expect.equals(expected, res); |
| } |
| |
| checkString(string, expected) { |
| var runes = new Runes(string); |
| var res = runes.fold("", (prev, cur) => "${prev}${cur}"); |
| Expect.equals(expected, res); |
| } |
| |
| checkConst(string, expected) { |
| var runes = new Runes(string); |
| var res = runes.fold(0, (prev, cur) => 1); |
| Expect.equals(expected, res); |
| } |
| |
| |
| main() { |
| checkInt('', 0); |
| checkInt('\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a', 55); |
| |
| checkString('', ''); |
| checkString('a', '97'); |
| checkString('\x01\x02\x03\x04\x05', "12345"); |
| |
| checkConst('', 0); |
| checkConst('____', 1); |
| } |