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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: Firefox changed IFRAME behaviour - I need a remedy??
Date: Sun, 04 Aug 2019 11:44:35 +0200
Organization: PointedEars Software (PES)
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Message-ID: <2365295.nEtfeUBsog@PointedEars.de>
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Michael Haufe (TNO) wrote:

> On Friday, August 2, 2019 at 7:59:50 AM UTC-5, dr.j.r...@gmail.com wrote:
>> I use an Object as a Set, and don't need the additional properties
>> of a Set.
> 
> If you want a set, use a Set. Semantics matter. All elements of a set must
> support an equality test. Using an object you can't do this as you are
> forced to represent every member as a string. Example:

JFTR, a Set in OOPLs *is* conceptually, and particularly in ECMAScript Ed. 
6+ *literally*, an object.  It is just not *an Object instance* when built-
in, and it would not be a *plain* Object instance when emulated (yes, this 
is possible using explicit setters and getters, or ES 6+ Proxy [but the
latter is probably pointless]).

<https://www.ecma-international.org/ecma-262/6.0/index.html#sec-set-objects>
<https://www.ecma-international.org/ecma-262/10.0/index.html#sec-set-objects>
 
> <script>
> var fakeSet = Object.create(null)
> 
> fakeSet[undefined] = true
> fakeSet['undefined'] = true
> 
> fakeSet[undefined] === fakeSet['undefined'] // true

Well, this is rather unsurprising, as the previous two assignments are 
already equivalent.  The proof is more convincing if you omit the previous 
“undefined” property access.
 
-- 
PointedEars
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