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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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    Mathias Bynens‏Verified account @mathias 3 Sep 2018
    • Report Tweet
    • Report NetzDG Violation

    Array.prototype.sort is now stable in @v8js v7.0 / Chrome 70! 🎉 Previously, V8 used an unstable QuickSort for arrays with more than 10 elements. Now, we use the stable TimSort algorithm. Demo: https://mathiasbynens.be/demo/sort-stability …pic.twitter.com/zrynE48Vcp

    7:45 AM - 3 Sep 2018
    • 669 Retweets
    • 2,038 Likes
    • Alexandre Victoor Alberto War 第4金曜日は粗大ごみの日 Raymond Etornam Paul Pajo 🧢 [Jan/3➞₿ 🔑∎] #Insulin4All {#HODL} Brodevhood Web Frameworks Briefly Matt Harrison Akash Dhanagundi
    43 replies 669 retweets 2,038 likes
      1. New conversation
      2. Mathias Bynens‏Verified account @mathias 3 Sep 2018
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        Although not technically a spec violation, stable sort was one of the oldest and most popular developer requests in our @v8js bug tracker (issue #90!): https://bugs.chromium.org/p/v8/issues/detail?id=90 … Kudos to @nimODota for making it happen!

        4 replies 3 retweets 40 likes
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      3. Mathias Bynens‏Verified account @mathias 3 Sep 2018
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        • Report NetzDG Violation

        Fingers crossed @ChakraCore eventually switches to a stable sorting algorithm, too. Then we could update the Array.prototype.sort spec to require stability and call it a day. One can dream… (@ChakraCore’s sort is currently only stable for arrays with 512 or fewer elements.)

        7 replies 7 retweets 71 likes
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      4. Mathias Bynens‏Verified account @mathias 1 Nov 2018
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        Update: @ChakraCore just landed a stable MergeSort, making its Array.prototype.sort stable — even for arrays with more than 512 elements! https://github.com/Microsoft/ChakraCore/commit/c565b12f0aada9fc188cea5eb5243699d27c56e6 … When this ships in Edge, Array.prototype.sort is finally 100% stable in all browsers! 🎉

        1 reply 16 retweets 62 likes
        Show this thread
      5. End of conversation
      1. New conversation
      2. Miguel Andrade‏ @maskedwarrior 29 Jan 2019
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        Replying to @mathias @v8js

        How can one detect if sort is stable?

        1 reply 0 retweets 0 likes
      3. Mathias Bynens‏Verified account @mathias 29 Jan 2019
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        Replying to @maskedwarrior @v8js

        It’s not possible to fully “prove” it with a test, but you can observe it with code like the one in my tweet. Here are the Test262 tests I wrote:https://github.com/tc39/test262/pull/1977 …

        1 reply 0 retweets 0 likes
      4. 4 more replies
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      2. darek‏ @darek61778194 4 Sep 2018
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        Replying to @mathias @v8js

        This gonna break some apps, right?

        1 reply 0 retweets 0 likes
      3. Mathias Bynens‏Verified account @mathias 4 Sep 2018
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        Replying to @darek61778194 @v8js

        I doubt it. Which apps rely on sort being unstable?

        1 reply 0 retweets 2 likes
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      2. Ali Ghassemi‏ @AliGTheOtherOne 17 Oct 2018
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        Replying to @mathias @v8js

        Lots of badly written sort functions will start breaking now. A common one is `[3,1,2].sort( (a, b) => a > b );` Oh well, now is as good as any time to make this change I guess.

        1 reply 0 retweets 2 likes
      3. Mathias Bynens‏Verified account @mathias 17 Oct 2018
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        Replying to @AliGTheOtherOne @v8js

        What do you mean by “breaking”? Inconsistent comparison functions can result in an arbitrary order for “equal” elements, with or without this change.

        1 reply 0 retweets 0 likes
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      2. Yaffle‏ @4esn0k 3 Sep 2018
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        Replying to @mathias @v8js

        https://github.com/v8/v8/blob/master/third_party/v8/builtins/array-sort.tq … ?

        1 reply 0 retweets 0 likes
      3. Mathias Bynens‏Verified account @mathias 3 Sep 2018
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        Replying to @4esn0k

        Indeed. Expect a @v8js blog post with more details soon!

        1 reply 0 retweets 0 likes
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