1 // |reftest| shell-option(--enable-symbols-as-weakmap-keys) skip-if(release_or_beta||!xulRuntime.shell) -- symbols-as-weakmap-keys is not released yet, requires shell-options
2 // Copyright (C) 2022 Igalia, S.L. All rights reserved.
3 // This code is governed by the BSD license found in the LICENSE file.
5 esid: sec-weakset-iterable
7 Returns the new WeakSet adding Symbol values from the iterable parameter.
9 WeakSet ( [ _iterable_ ] )
11 d. Let _status_ be Completion(Call(_adder_, _set_, « _nextValue_ »)).
13 WeakSet.prototype.add ( _value_ ):
14 6. Append _value_ as the last element of _entries_.
15 features: [Symbol, WeakSet, symbols-as-weakmap-keys]
16 includes: [compareArray.js]
19 var first = Symbol('a description');
20 var second = Symbol('a description');
22 var realAdd = WeakSet.prototype.add;
23 WeakSet.prototype.add = function(value) {
25 return realAdd.call(this, value);
27 var s = new WeakSet([first, second, Symbol.hasInstance]);
31 [first, second, Symbol.hasInstance],
32 "add() was called 3 times, on the two unregistered and one well-known symbols in order"
35 WeakSet.prototype.add = realAdd;