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mathias's profile
Mathias Bynens
Mathias Bynens
Mathias Bynens
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@mathias

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Mathias BynensVerified account

@mathias

I work on @ChromeDevTools & @v8js at Google and on ECMAScript through TC39. ♥ JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.

Munich, Germany
mths.be
Joined January 2007

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    1. Ed Moore‏ @_edmoore 17 Jul 2019
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      Can someone explain why the difference? #LazyWeb #Chrome #Firefoxpic.twitter.com/6ADPytXEk0

      1 reply 2 retweets 7 likes
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    2. Ed Moore‏ @_edmoore 17 Jul 2019
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      Interesting. Chrome and Firefox seem to pass the sorting arguments differentlypic.twitter.com/WGbuUqFkxu

      1 reply 0 retweets 1 like
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    3. Ed Moore‏ @_edmoore 17 Jul 2019
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      @mathias @BrendanEich Which one is meant to be correct?

      1 reply 0 retweets 0 likes
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    4. BrendanEich‏Verified account @BrendanEich 17 Jul 2019
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      Replying to @_edmoore @mathias

      Those are not “consistent comparison functions” (defined by spec, see link), so results are implementation-defined. See https://www.ecma-international.org/ecma-262/9.0/index.html#sec-array.prototype.sort …

      2 replies 0 retweets 2 likes
    5. Ed Moore‏ @_edmoore 17 Jul 2019
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      Replying to @BrendanEich @mathias

      Shouldn't something like `[1,2,3].sort(() => -1)` do the same thing in all browsers?

      1 reply 0 retweets 0 likes
    6. BrendanEich‏Verified account @BrendanEich 17 Jul 2019
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      Replying to @_edmoore @mathias

      “If comparefn is not undefined and is not a consistent comparison function for the elements of this array (see below), the sort order is implementation-defined.”

      1 reply 0 retweets 6 likes
    7. Mathias Bynens‏Verified account @mathias 18 Jul 2019
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      Replying to @BrendanEich @_edmoore

      Think of it this way: behind the scenes, the JS engine is comparing the elements in the array. ➡️ is 1 less than 2? ➡️ is 2 less than 1? Since your comparison function always returns -1, the answer is always "yes". This doesn't make sense.

      2 replies 1 retweet 9 likes
    8. Ujjwal Sharma‏ @ryzokuken 18 Jul 2019
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      Replying to @mathias @BrendanEich @_edmoore

      @mathias would the normative change to make Array#sort stable explicitly improve the situation in cases like these?

      1 reply 0 retweets 0 likes
    9. BrendanEich‏Verified account @BrendanEich 18 Jul 2019
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      Replying to @ryzokuken @mathias @_edmoore

      Not necessarily, because the comparison function is inconsistent. This is an error on the programmer’s part but not easy to catch at runtime. It is in any case not important for interoperability, as far as I know.

      1 reply 0 retweets 5 likes
      Mathias Bynens‏Verified account @mathias 18 Jul 2019
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      Replying to @BrendanEich @ryzokuken @_edmoore

      Brendan is (of course) correct. Stability is only guaranteed for consistent comparison functions.

      1:35 AM - 18 Jul 2019
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      • Ed Moore Ujjwal Sharma Tripurari Shankar
      1 reply 0 retweets 3 likes
        1. Ujjwal Sharma‏ @ryzokuken 18 Jul 2019
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          Replying to @mathias @BrendanEich @_edmoore

          Okay, thanks!

          0 replies 0 retweets 0 likes
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