Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.javascript > #40277

Re: Decimal numeric string to hexadecimal numeric string?

Show key headers only | View raw

Michael Haufe (TNO) wrote:

> On Wednesday, June 30, 2021 at 5:51:16 PM UTC-5, Thomas 'PointedEars' Lahn
> wrote:
>> parseInt() should not be called without a radix value because then the
>> interpretation of the string depends on its prefix. This is a FAQ.
> 
> The FAQ should be updated.

I am still waiting for, and am looking forward to, your pull requests 
*shrug*

<https://github.com/PointedEars/FAQ-cljs>

> This now depends on the browser version.

Not really, see below.
 
> With the following:
> 
> parseInt("070")
> 
> I see these results:
> 
> Brave (Chromium 91):  70
> Firefox : 89: 70
> IE 11: 70
> IE 10: 70
> IE 9: 70
> IE 8: 56
> IE 7: 56
> IE 5: 56
> 
> <https://codepen.io/mlhaufe/pen/jOmERVg?editors=1000>
> 
> (When testing on older browsers use the debug view)

The interpretation of octal string literals by parseInt() without “radix” 
argument *always* depended on the "browser version", more precisely the 
ECMAScript implementation supported, and the version of the script engine 
used, by the runtime environment.  That is *the* reason why the FAQ 
recommends to specify the “radix” argument since time immemorial:

<http://PointedEars.de/scripts/faq/cljs/#parseIntBase>

Compare

<https://www.ecma-international.org/wp-content/uploads/ECMA-262_3rd_edition_december_1999.pdf#page=89>

with

<https://www.ecma-international.org/wp-content/uploads/ECMA-262_5th_edition_december_2009.pdf#page=114>


Microsoft Internet Explorer/MSHTML 5.0 through 8.0 support/use Microsoft 
JScript 5.0 through 5.8.x which implement ECMAScript Ed. 3/5.x¹; whereas 
IE/MSHTML 9 and 10 support/use JScript 9.0 and 10.0.x, which implement 
ECMAScript Ed. 5.x.

The latest version of Firefox supports Mozilla JavaScript 78 and later
(I have only Firefox 78 here), and uses a recent version of Mozilla 
SpiderMonkey, which implements ECMAScript 2020 or later.

Chromium 91 supports Google JavaScript 9.0.257.29 or later, and uses Google 
V8, which implements ECMAScript 2020 or later.

So your results are unsurprising (but valuable²) to me.  See also:

<http://PointedEars.de/es-matrix#version-info>


BTW, it is July in Europe now, so ECMAScript 2021 was "released" :-o

<https://262.ecma-international.org/>

_______
¹  Here we can see that an ECMAScript implementation does not always meet
   what is unambiguously specified in the Edition that it claims to
   implement.
²  Strangely enough, I do not have a test case for that in the ECMAScript
   Support Matrix yet: <http://PointedEars.de/es-matrix/?filter=parseInt>
-- 
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.

Back to comp.lang.javascript | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Decimal numeric string to hexadecimal numeric string? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-06-17 14:28 -0700
  Re: Decimal numeric string to hexadecimal numeric string? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2021-06-17 21:38 -0700
    Re: Decimal numeric string to hexadecimal numeric string? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-06-19 00:39 -0700
  Re: Decimal numeric string to hexadecimal numeric string? Scott Sauyet <scott@sauyet.com> - 2021-06-18 05:59 -0700
    Re: Decimal numeric string to hexadecimal numeric string? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-06-19 00:45 -0700
      Re: Decimal numeric string to hexadecimal numeric string? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-06-19 11:42 +0100
        Re: Decimal numeric string to hexadecimal numeric string? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2021-07-01 00:51 +0200
          Re: Decimal numeric string to hexadecimal numeric string? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2021-06-30 17:39 -0700
            Re: Decimal numeric string to hexadecimal numeric string? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-07-01 01:50 +0100
              Re: Decimal numeric string to hexadecimal numeric string? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2021-07-01 12:46 +0200
            Re: Decimal numeric string to hexadecimal numeric string? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2021-07-01 12:43 +0200

csiph-web