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Re: Why JavaScript has two zeros

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From Tim Streater <timstreater@greenbee.net>
Newsgroups comp.lang.javascript
Subject Re: Why JavaScript has two zeros
Date Fri, 23 Dec 2016 09:05:53 +0000
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In article <LMKbWltZUGXYFwDf@invalid.uk.co.demon.merlyn.invalid>, Dr J
R Stockton <reply1600@merlyn.demon.co.uk.invalid> wrote:

>In comp.lang.javascript message <1bm6A.536745$IJ6.194196@fx46.am4>, Wed,
>21 Dec 2016 02:55:57, cyber@2trom.com posted:
>
>>abdulapopoola@gmail.com wrote:
>>> Do you know that there are actually two zero value types in
>>>JavaScript (as well as most languages)? Read to know why this matters,
>>>what scenarios to watch out for and some of the quirks of the IEEE 754
>>>standard.
>>>
>>> https://abdulapopoola.com/2016/12/19/why-javascript-has-two-zeros-0-and-0/
>>
>>I imagine that also having -0i and 0i might be too complex for JavaScript.
>
>JavaScript has two zeroes (of equal but distinguishable values) because
>IEEE 754 is a sign-magnitude-exponent representation.  They are the
>reciprocals of the two infinities. Long-established readers with good
>memories should recall at least one occasion on which having two zeroes
>was arithmetically useful.

Not sure I ever found it useful for integers - such as on the CDC 6000
series machines.

-- 
"Once you adopt the unix paradigm, the variants cease to be a problem - you
bitch, of course, but that's because bitching is fun, unlike M$ OS's, where 
bitching is required to keep your head from exploding." - S Stremler in afc

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Why JavaScript has two zeros abdulapopoola@gmail.com - 2016-12-19 21:09 -0800
  Re: Why JavaScript has two zeros "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2016-12-20 11:46 +0100
    Re: Why JavaScript has two zeros John Harris <niam@jghnorth.org.uk.invalid> - 2016-12-20 17:58 +0000
      Re: Why JavaScript has two zeros "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2016-12-20 23:56 +0100
        Re: Why JavaScript has two zeros John Harris <niam@jghnorth.org.uk.invalid> - 2016-12-21 13:59 +0000
  Re: Why JavaScript has two zeros <cyber@2trom.com> - 2016-12-21 02:55 +0000
    Re: Why JavaScript has two zeros Dr J R Stockton <reply1600@merlyn.demon.co.uk.invalid> - 2016-12-22 23:43 +0000
      Re: Why JavaScript has two zeros "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2016-12-23 09:04 +0100
        Re: Why JavaScript has two zeros Dr J R Stockton <reply1600@merlyn.demon.co.uk.invalid> - 2016-12-25 22:15 +0000
        Re: Why JavaScript has two zeros Dr J R Stockton <reply1600@merlyn.demon.co.uk.invalid> - 2016-12-25 23:39 +0000
      Re: Why JavaScript has two zeros Tim Streater <timstreater@greenbee.net> - 2016-12-23 09:05 +0000
      Re: Why JavaScript has two zeros Ram Tobolski <ramtob@gmail.com> - 2016-12-24 02:28 -0800
        Re: Why JavaScript has two zeros Dr J R Stockton <reply1600@merlyn.demon.co.uk.invalid> - 2016-12-25 22:00 +0000
    Re: Why JavaScript has two zeros "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2016-12-26 12:08 -0800
  Why JavaScript has two zeros Ram Tobolski <ramtob@gmail.com> - 2016-12-21 10:20 -0800
  Re: Why JavaScript has two zeros "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2016-12-26 12:03 -0800

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