| // 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. |
| |
| // @dart = 2.9 |
| |
| /// @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 resulting Iterable runs through the elements |
| /// returned by f for each element of this, in order. |
| /// @author kaigorodov |
| |
| import "../../../Utils/expect.dart"; |
| import "dart:collection"; |
| |
| Iterable f(int element) { |
| List<int> res = new List<int>(element); |
| for (int k = 0; k < element; k++) { |
| res[k] = element; |
| } |
| return res; |
| } |
| |
| main() { |
| DoubleLinkedQueue<int> queue = new DoubleLinkedQueue<int>(); |
| |
| for (int k = 0; k < 10; k++) { |
| queue.add(k); |
| } |
| |
| Iterator expanded = queue.expand(f).iterator; |
| int expected = 1; |
| while (expanded.moveNext()) { |
| Expect.equals(expected, expanded.current); |
| for (int k = 1; k < expected; k++) { |
| Expect.isTrue(expanded.moveNext()); |
| Expect.equals(expected, expanded.current); |
| } |
| expected++; |
| } |
| |
| } |