| // Copyright (c) 2016, 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.md file. |
| |
| const int max = 100; |
| |
| main() { |
| var closures = []; |
| var closures2 = []; |
| var last; |
| for (int i = 0; i < max; i++) { |
| closures.add(() => last = i); |
| closures2.add(() { |
| if (last != max - 1) throw "last: $last != ${max - 1}"; |
| }); |
| } |
| int sum = 0; |
| for (Function f in closures) { |
| sum += f(); |
| } |
| for (Function f in closures2) { |
| f(); |
| } |
| // This formula is credited to Gauss. Search for "Gauss adding 1 to 100". |
| int expectedSum = (max - 1) * max ~/ 2; |
| if (expectedSum != sum) { |
| throw new Exception("Unexpected sum = $sum != $expectedSum"); |
| } |
| } |