| // Copyright (c) 2011, 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 Iterable expand(Iterable f(E element)) |
| /// Expands each element of this [Iterable] into zero or more elements. |
| /// The resulting [Iterable] runs through the elements returned by [f] for each |
| /// element of this, in order. |
| /// @description Checks that the method expands each element of this Iterable |
| /// into zero or more elements. |
| /// @author kaigorodov |
| |
| import "../../../Utils/expect.dart"; |
| import "dart:collection"; |
| |
| main() { |
| DoubleLinkedQueue queue = new DoubleLinkedQueue(); |
| |
| for (int k = 0; k < 10; k++) { |
| Expect.equals(0, queue.expand((element) => []).length); |
| Expect.equals(k, queue.expand((element) => [element]).length); |
| Expect.equals(2 * k, queue.expand((element) => [element, element]).length); |
| queue.add(k); |
| } |
| } |