| // 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<E> skipWhile(bool test(E value)) |
| /// Returns an [Iterable] that skips leading elements while [test] is satisfied. |
| /// @description Checks that all first elements that satisfy [test] are removed, |
| /// and elements after are retained. |
| /// @author kaigorodov |
| |
| import "dart:collection"; |
| import "../../../Utils/expect.dart"; |
| |
| void check(List a0, bool test(var element)) { |
| DoubleLinkedQueue queue = new DoubleLinkedQueue.from(a0); |
| Iterator it0 = a0.iterator; |
| Iterator it = queue.skipWhile(test).iterator; |
| int skipCount = 0; |
| |
| // skip manually |
| bool hasNext0; |
| while ((hasNext0 = it0.moveNext()) && test(it0.current)) { |
| skipCount++; |
| } |
| |
| // check that the rest of a0 is identical to a |
| int len = 0; |
| for (;;) { |
| bool hasNext = it.moveNext(); |
| Expect.equals(hasNext0, hasNext); |
| if (!hasNext0) break; |
| len++; |
| Expect.equals(it0.current, it.current); |
| hasNext0 = it0.moveNext(); |
| } |
| Expect.equals(a0.length - skipCount, len); |
| } |
| |
| main() { |
| List a0 = [1, 3, 7, 4, 5, 6]; |
| check(a0, (var element) => element == 1); |
| check(a0, (var element) => true); |
| check(a0, (var element) => false); |
| check(a0, (var element) => element > 4); |
| check(a0, (var element) => element < 4); |
| check(a0, (var element) => element == 4); |
| } |