Strict mode Passingnon-Strict mode Passing
Features:
- ∅
// Copyright (C) 2015 the V8 project authors. All rights reserved. // This code is governed by the BSD license found in the LICENSE file. /*--- esid: sec-weakset.prototype.add description: Returns `this` when new value is duplicate. info: | WeakSet.prototype.add ( value ) 1. Let S be this value. ... 6. Repeat for each e that is an element of entries, a. If e is not empty and SameValueZero(e, value) is true, then i. Return S. ... ---*/ var foo = {}; var s = new WeakSet([foo]); assert.sameValue(s.add(foo), s, '`s.add(foo)` returns `s`');