Johnni Winther
7914382b50
In response to https://github.com/dart-lang/language/pull/2960 TEST=existing expectation tests Change-Id: I5c0d9070b98074c167dea0a0b9a0d576d4aa33d3 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/291825 Reviewed-by: Slava Egorov <vegorov@google.com> Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
43 lines
1.0 KiB
Dart
43 lines
1.0 KiB
Dart
// Copyright (c) 2023, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'dart:collection';
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class NegativeLengthList<E> with ListMixin<E> {
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final List<E> _list;
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NegativeLengthList(this._list);
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int get length => _list.length <= 0 ? -1 : _list.length;
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void set length(int value) {
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_list.length = value;
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}
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E operator [](int index) => _list[index];
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void operator []=(int index, E value) {
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_list[index] = value;
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}
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}
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int switchList(List<int> list) => switch (list) {
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[_, _, ...] => 2,
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[_] => 1,
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[] => 0,
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};
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main() {
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expect(0, switchList([]));
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expect(1, switchList([0]));
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expect(2, switchList([0, 1]));
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expect(0, switchList(NegativeLengthList([])));
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expect(1, switchList(NegativeLengthList([0])));
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expect(2, switchList(NegativeLengthList([0, 1])));
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}
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expect(expected, actual) {
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if (expected != actual) throw 'Expected $expected, actual $actual';
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}
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