| // 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<E> where(bool test(E element)) |
| /// Returns a lazy [Iterable] with all elements that satisfy the predicate [test]. |
| /// @description Checks that the returned [Iterable] contains all elements |
| /// from [this] that satisfy [test], and all other elements are skipped. |
| /// @author msyabro |
| |
| import "../../../Utils/expect.dart"; |
| |
| void check(string, bool test (int element)) { |
| var runes = new Runes(string); |
| var res = runes.where(test); |
| |
| var count = 0; |
| |
| for(int i = 0 ; i < string.length; ++i) { |
| if(test(runes.elementAt(i))) { |
| Expect.equals(runes.elementAt(i), res.elementAt(count)); |
| ++count; |
| } |
| } |
| Expect.equals(count, res.length); |
| } |
| |
| main() { |
| check('', (e) => true); |
| check('a', (e) => false); |
| check('\x01\x01\x01\x02\x01\x01', (e) => e == 1 ); |
| check('\x00\x01\x02\x03\x04\x05', (e) => e < 5 ); |
| check('\x00\x01\x02\x03\x04\x05', (e) => e > 0 ); |
| check('\x00\x01\x02\x03\x04\x05', (e) => e != 2 ); |
| } |