Re: Firefox changed IFRAME behaviour - I need a remedy??

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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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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
FAQ: <http://PointedEars.de/faq> | <http://PointedEars.de/es-matrix>
<https://github.com/PointedEars> | <http://PointedEars.de/wsvn/>
Twitter: @PointedEars2 | Please do not cc me./Bitte keine Kopien per E-Mail.

Thread

Firefox changed IFRAME behaviour - I need a remedy?? dr.j.r.stockton@gmail.com - 2019-07-20 12:53 -0700
  Re: Firefox changed IFRAME behaviour - I need a remedy?? Andrew Poulos <ap_prog@hotmail.com> - 2019-07-21 15:15 +1000
  Re: Firefox changed IFRAME behaviour - I need a remedy?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2019-07-22 03:07 -0700
  Re: Firefox changed IFRAME behaviour - I need a remedy?? Martin Honnen <martin.honnen@gmx.de> - 2019-07-22 16:20 +0200
    Re: Firefox changed IFRAME behaviour - I need a remedy?? dr.j.r.stockton@gmail.com - 2019-07-30 08:20 -0700
  Re: Firefox changed IFRAME behaviour - I need a remedy?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2019-07-30 18:24 -0700
    Re: Firefox changed IFRAME behaviour - I need a remedy?? dr.j.r.stockton@gmail.com - 2019-07-31 04:14 -0700
      Re: Firefox changed IFRAME behaviour - I need a remedy?? dr.j.r.stockton@gmail.com - 2019-07-31 05:32 -0700
        Re: Firefox changed IFRAME behaviour - I need a remedy?? "R.Wieser" <address@not.available> - 2019-07-31 18:22 +0200
          Re: Firefox changed IFRAME behaviour - I need a remedy?? dr.j.r.stockton@gmail.com - 2019-08-02 02:37 -0700
            Re: Firefox changed IFRAME behaviour - I need a remedy?? "R.Wieser" <address@not.available> - 2019-08-02 13:38 +0200
              Re: Firefox changed IFRAME behaviour - I need a remedy?? dr.j.r.stockton@gmail.com - 2019-08-02 05:59 -0700
                Re: Firefox changed IFRAME behaviour - I need a remedy?? "R.Wieser" <address@not.available> - 2019-08-02 17:55 +0200
                Re: Firefox changed IFRAME behaviour - I need a remedy?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2019-08-02 15:57 -0700
                Re: Firefox changed IFRAME behaviour - I need a remedy?? dr.j.r.stockton@gmail.com - 2019-08-03 06:11 -0700
                Re: Firefox changed IFRAME behaviour - I need a remedy?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2019-08-04 11:44 +0200
              Re: Firefox changed IFRAME behaviour - I need a remedy?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2019-08-02 15:10 -0700
                Re: Firefox changed IFRAME behaviour - I need a remedy?? "R.Wieser" <address@not.available> - 2019-08-03 08:59 +0200
                OT: Re: Firefox changed IFRAME behaviour - I need a remedy?? dr.j.r.stockton@gmail.com - 2019-08-03 05:18 -0700
                Re: OT: Re: Firefox changed IFRAME behaviour - I need a remedy?? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2019-08-03 15:27 +0200
                Re: OT: Re: Firefox changed IFRAME behaviour - I need a remedy?? dr.j.r.stockton@gmail.com - 2019-08-03 09:28 -0700
                Re: OT: Re: Firefox changed IFRAME behaviour - I need a remedy?? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2019-08-04 12:32 +0200
                Re: Firefox changed IFRAME behaviour - I need a remedy?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2019-08-04 11:30 +0200
                Re: Firefox changed IFRAME behaviour - I need a remedy?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2019-08-04 15:31 -0700
                Re: Firefox changed IFRAME behaviour - I need a remedy?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2019-08-05 13:48 +0200
                Re: Firefox changed IFRAME behaviour - I need a remedy?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2019-08-05 16:51 -0700
                Re: Firefox changed IFRAME behaviour - I need a remedy?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2019-08-07 01:42 +0200
                Re: Firefox changed IFRAME behaviour - I need a remedy?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2019-08-07 01:47 -0700
                Re: Firefox changed IFRAME behaviour - I need a remedy?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2019-08-08 20:56 +0200
                Re: Firefox changed IFRAME behaviour - I need a remedy?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2019-08-08 13:16 -0700
                Re: Firefox changed IFRAME behaviour - I need a remedy?? Martin Leese <please@see.Web.for.e-mail.INVALID> - 2019-08-08 23:57 -0600
                Re: Firefox changed IFRAME behaviour - I need a remedy?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2019-08-09 12:48 +0200
                Re: Firefox changed IFRAME behaviour - I need a remedy?? dr.j.r.stockton@gmail.com - 2019-08-05 06:37 -0700
                Re: Firefox changed IFRAME behaviour - I need a remedy?? John G Harris <niam@jghnorth.org.uk.invalid> - 2019-08-05 18:46 +0100
                Re: Firefox changed IFRAME behaviour - I need a remedy?? dr.j.r.stockton@gmail.com - 2019-08-06 03:39 -0700
                Re: Firefox changed IFRAME behaviour - I need a remedy?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2019-08-05 17:30 -0700
            Re: Firefox changed IFRAME behaviour - I need a remedy?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2019-08-02 15:05 -0700
      Re: Firefox changed IFRAME behaviour - I need a remedy?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2019-07-31 18:58 -0700
        Re: Firefox changed IFRAME behaviour - I need a remedy?? dr.j.r.stockton@gmail.com - 2019-08-02 05:01 -0700
          Re: Firefox changed IFRAME behaviour - I need a remedy?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2019-08-02 16:07 -0700
            Re: Firefox changed IFRAME behaviour - I need a remedy?? dr.j.r.stockton@gmail.com - 2019-08-03 08:19 -0700
              Re: Firefox changed IFRAME behaviour - I need a remedy?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2019-08-03 18:42 -0700
                Re: Firefox changed IFRAME behaviour - I need a remedy?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2019-08-04 11:27 +0200

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