mirror of https://github.com/tc39/test262.git
27 lines
763 B
JavaScript
27 lines
763 B
JavaScript
// Copyright (C) 2016 the V8 project authors. All rights reserved.
|
|
// This code is governed by the BSD license found in the LICENSE file.
|
|
/*---
|
|
es6id: 23.2.1
|
|
description: Subclassing the Set object
|
|
info: >
|
|
23.2.1 The Set Constructor
|
|
|
|
...
|
|
|
|
The Set constructor is designed to be subclassable. It may be used as the
|
|
value in an extends clause of a class definition. Subclass constructors that
|
|
intend to inherit the specified Set behaviour must include a super call to the
|
|
Set constructor to create and initialize the subclass instance with the
|
|
internal state necessary to support the Set.prototype built-in methods.
|
|
---*/
|
|
|
|
class S extends Set {}
|
|
|
|
var set = new S([{}, {}]);
|
|
|
|
assert.sameValue(set.size, 2);
|
|
|
|
set.add({});
|
|
|
|
assert.sameValue(set.size, 3);
|