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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. Donovan Buck‏ @dtex 2 Jul 2018
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      • Report NetzDG Violation

      When Object.keys is called in @v8js, no guarantees are made about the order of the keys in the returned array. In practice, they are sorted alphanumerically on the first ten characters of the key. Why ten? Twelve would be nice. Sixteen is also a nice number.

      2 replies 0 retweets 0 likes
    2. Mathias Bynens‏Verified account @mathias 3 Jul 2018
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      Replying to @dtex @v8js

      What makes you say that? All JS engines follow the same order as far as I can tell. The spec has a bug: https://github.com/tc39/ecma262/pull/1242 …pic.twitter.com/UBV0hp3mUF

      1 reply 0 retweets 0 likes
    3. Donovan Buck‏ @dtex 3 Jul 2018
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      Replying to @mathias @v8js

      Thanks for that link, that helped me narrow it down. If a key is a String and a valid number it is sorted in ascending numeric order, but only using the first ten characters of the string.pic.twitter.com/BTGxs510QY

      2 replies 0 retweets 0 likes
    4. Donovan Buck‏ @dtex 3 Jul 2018
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      Replying to @dtex @mathias @v8js

      Sidenote: if your curious why I'd wanted to use long numbers as keys, they are timestamps.

      1 reply 0 retweets 1 like
    5. Donovan Buck‏ @dtex 3 Jul 2018
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      Replying to @dtex @mathias @v8js

      Also, I didn't mean to impy "just V8". Behavior is same in other browsers, I was in node.js so I referenced V8 in particular. You're right about spec. If it were in there I wouldn't have shouted into the ether.

      1 reply 0 retweets 0 likes
    6. Donovan Buck‏ @dtex 3 Jul 2018
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      Replying to @dtex @mathias @v8js

      Needed a cup of coffee to digest the GH issue. The point at which they are no longer sorted as ascending array indices is 2^32 (has nothing to do with string length) which make sense. Should that condition be documented in the spec under OrdinaryOwnPropertyKeys?pic.twitter.com/bMtW5TYVKU

      1 reply 0 retweets 0 likes
      Mathias Bynens‏Verified account @mathias 3 Jul 2018
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      Replying to @dtex @v8js

      Exactly! The PR I pointed to fixes the spec to match existing implementations. (Currently, the spec uses integer indices instead of array indices, which essentially moves this cut-off point to a higher number, but no one implements that.)

      7:47 AM - 3 Jul 2018
      1 reply 0 retweets 0 likes
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        2. Donovan Buck‏ @dtex 3 Jul 2018
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          Replying to @mathias @v8js

          Cool, thank you so much! I should have seen it under 6.1.7 in the spec. How lucky am I that you saw my tweet?

          1 reply 0 retweets 1 like
        3. Mathias Bynens‏Verified account @mathias 3 Jul 2018
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          Replying to @dtex @v8js

          Right back at you! Your comments were helpful; they confirmed that increasing this seemingly arbitrary number limit to a greater number would still be confusing, just in a different way. (I tried to make that point here: https://github.com/tc39/ecma262/pull/1242#issuecomment-399687202 … but it didn’t seem to land.)

          1 reply 0 retweets 2 likes
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