Sergey G. Grekhov
82b78916fd
Change-Id: If31c487e3ebe2c1ae847aff7c8994580b8b6f2f6 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/309660 Reviewed-by: Alexander Thomas <athom@google.com> Commit-Queue: Alexander Thomas <athom@google.com>
50 lines
1.2 KiB
Dart
50 lines
1.2 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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// This test captures the changes introduced in 2.29 of the patterns proposal.
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import 'dart:collection';
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import "package:expect/expect.dart";
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main() {
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var map = {'a': 1, 'b': 2};
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// Map patterns don't access length.
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Expect.isTrue(switch (NoLengthMap(map)) { {'a': _} => true, _ => false });
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// Map patterns match even if there are extra keys.
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Expect.equals(
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'a b',
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switch (map) {
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{'a': _, 'b': _} => 'a b',
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{'a': _} => 'a',
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{'b': _} => 'b',
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_ => '???'
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});
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}
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class NoLengthMap extends MapBase<String, int> {
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final Map<String, int> _inner;
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NoLengthMap(this._inner);
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@override
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int get length => throw UnsupportedError('No length!');
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@override
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int? operator [](Object? key) => _inner[key];
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@override
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void operator []=(String key, int value) => _inner[key] = value;
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@override
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void clear() => _inner.clear();
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@override
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Iterable<String> get keys => _inner.keys;
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@override
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int? remove(Object? key) => _inner.remove(key);
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}
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