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From: Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups: comp.lang.javascript
Subject: Re: why the ! operator can be used to determine a string is null?
Date: Wed, 09 Aug 2017 16:14:04 +0100
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"Evertjan." <exxjxw.hannivoort@inter.nl.net> writes:

> Jon Ribbens <jon+usenet@unequivocal.eu> wrote on 09 Aug 2017 in 
> comp.lang.javascript:
>
>> Unfortunately people tend to be very imprecise as to the meaning of
>> the phrase "null string", and may variously mean either the actual
>> null value or an empty string.
>
> Indeed, 
> a string is NEVER null, 
> because then it is NOT a string.

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.  It's not a clear way to speak about such
things but we're all guilty of using short-hands now and again.

<snip>
-- 
Ben.