| // 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 Iterable<T> expand<T>(Iterable<T> f(E element)) |
| /// Expand each element of this Iterable into zero or more elements. |
| /// The resulting Iterable will run through the elements returned by f for each |
| /// element of this, in iteration order. |
| /// @description Checks that the returned [Iterable] contains correct elements |
| /// and has the correct length. |
| /// @author msyabro |
| |
| |
| import "dart:typed_data"; |
| import "../../../Utils/expect.dart"; |
| |
| check(List<int> list) { |
| var l = new Uint8List.fromList(list); |
| |
| var res = l.expand((element) => [element * 2]); |
| Expect.equals(list.length, res.length); |
| for (int i = 0; i < list.length; ++i) { |
| Expect.equals(list[i] * 2, res.elementAt(i)); |
| } |
| |
| res = l.expand((element) => [element, element + 1]); |
| Expect.equals(list.length * 2, res.length); |
| for (int i = 0; i < list.length; ++i) { |
| Expect.equals(list[i], res.elementAt(2 * i)); |
| Expect.equals(list[i] + 1, res.elementAt(2 * i + 1)); |
| } |
| |
| res = l.expand((element) => [] ); |
| Expect.equals(0, res.length); |
| } |
| |
| main() { |
| check([]); |
| check([1]); |
| check([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]); |
| } |