Stephen Adams
90bba41618
`o is T` where `T` is an interface implemented by a class hierarchy can be implemented as `o instanceof R` where `R` is the root of the hierarchy. The common case is that `R` is a single implementation class. `is Record` and `is Type` now generally use `instanceof`. Fixes: #51366 Change-Id: I1943533bc53024f3199f71910034d49cf6661b22 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/294320 Commit-Queue: Stephen Adams <sra@google.com> Reviewed-by: Mayank Patke <fishythefish@google.com>
49 lines
1012 B
Dart
49 lines
1012 B
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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// `is` tests against some interface types are compiled to `instanceof` tests.
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/*member: isRecord:function(o) {
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return o instanceof A._Record;
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}*/
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isRecord(o) => o is Record;
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/*member: isRegExp:function(o) {
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return o instanceof A.JSSyntaxRegExp;
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}*/
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isRegExp(o) => o is RegExp;
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/*member: isString:function(o) {
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return typeof o == "string";
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}*/
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isString(o) => o is String;
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/*member: isType:function(o) {
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return o instanceof A._Type;
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}*/
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isType(o) => o is Type;
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/*member: main:ignore*/
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main() {
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final items = [
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1,
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'x',
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true,
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Object(),
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main,
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Type,
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(1, 2),
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(1, 2, 3),
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StringBuffer(),
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RegExp('a'),
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[1],
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];
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for (final item in items) {
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for (final test in [isRecord, isRegExp, isString, isType]) {
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print(test(item));
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}
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}
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}
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