Path: csiph.com!feeder.erje.net!2.eu.feeder.erje.net!news.mb-net.net!open-news-network.org!.POSTED.69.235.197.178.dynamic.wless.lssmb00p-cgnat.res.cust.swisscom.ch!not-for-mail
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: why the ! operator can be used to determine a string is null?
Date: Thu, 10 Aug 2017 04:33:17 +0200
Organization: PointedEars Software (PES)
Lines: 32
Message-ID: <1678649.tdWV9SEqCh@PointedEars.de>
References: <omcm6a$rga$1@gioia.aioe.org> <null-20170808165244@ram.dialup.fu-berlin.de> <slrnooju52.303.jon+usenet@sable.unequivocal.eu> <empty-string-20170808184854@ram.dialup.fu-berlin.de> <slrnoolr4r.303.jon+usenet@sable.unequivocal.eu> <XnsA7CCA5CE3CA47eejj99@194.109.6.166> <87zib8g4eb.fsf@bsb.me.uk> <10915888.O9o76ZdvQC@PointedEars.de> <877eycdzm9.fsf@bsb.me.uk> <2062468.ElGaqSPkdT@PointedEars.de> <871sokduyx.fsf@bsb.me.uk>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Mime-Version: 1.0
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 8Bit
Injection-Info: gwaiyur.mb-net.net; posting-host="69.235.197.178.dynamic.wless.lssmb00p-cgnat.res.cust.swisscom.ch:178.197.235.69"; logging-data="11604"; mail-complaints-to="abuse@open-news-network.org"
User-Agent: KNode/4.14.2
Cancel-Lock: sha1:L7PPOj+j8TSYTzX047eZWBUhtRI=
X-Face: %i>XG-yXR'\"2P/C_aO%~;2o~?g0pPKmbOw^=NT`tprDEf++D.m7"}HW6.#=U:?2GGctkL,f89@H46O$ASoW&?s}.k+&.<b';Md8`dH6iqhT)6C^.Px|[=M@7=Ik[_w<%n1Up"LPQNu2m8|L!/3iby{-]A+#YE}Kl{Cw$\U!kD%K}\2jz"QQP6Uqr],./"?;=4v
X-User-ID: U2FsdGVkX1/ZqQFBrO2yy4ralDcyBUkD/tyjgAhrBW+mF4nGwatkDQ==
Face: 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
Xref: csiph.com comp.lang.javascript:33750

Ben Bacarisse wrote:

> Thomas 'PointedEars' Lahn <PointedEars@web.de> writes:
>> Ben Bacarisse wrote:
>>> Thomas 'PointedEars' Lahn <PointedEars@web.de> writes:
>>>> Ben Bacarisse wrote:
>>> <snip>
>>>>> Further complicated by the fact that there is a character called null
>>>>> (sometimes Null, Nul or NULL) so a string can "be null" in that it
>>>>> contains just that character.
>>>> As we are talking about ECMAScript, it is the Unicode character U+0000
>>>> NULL (to my surprise, not “NUL” as in US-ASCII) whose standard
>>>> representation is a boxed “NUL” (AFAIK, it is *never* called “null”,
>>>> “Null” or “Nul”):
>>> If you can find an original copy of the standard you'll see a table of
>>> control characters that gives "Abbreviations" (though most are acronyms)
>>> and, as you say, NUL is the abbreviation for the first one.  After that
>>> table is an explanation that gives the name as "Null" and the
>>> abbreviation as "Nul" (for some reason not in caps).
>> *I have just cited* “an original copy of the standard”, so please cite
>> evidence supporting your claims.
> 
> X3.4-1967 "The American Standard for Information Interchange". 

We are not talking about *that* standard as that has nothing to do with 
ECMAScript; we are talking about the *Unicode* character, therefore the 
corresponding *Unicode* Standard.

-- 
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.