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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. Peter van der Zee‏ @kuvos 3 May 2019
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      Replying to @kuvos @Ghost1240145716

      (My parser has plenty of edge cases it does not yet catch so don't feel obliged to get it fixed or anything. Just found it interesting to match the convo.)

      2 replies 0 retweets 0 likes
    2. Ghost123‏ @Ghost1240145716 3 May 2019
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      Replying to @kuvos

      TBH. Locale I'm playing around with parsing when I get time. This days I'm testing ut decorators, class fields and private methods. A real PITY. Specially decorators. I looked at your source and noticed the complexity with obj expr / pattern parsing. You may separate that logic.

      1 reply 0 retweets 1 like
    3. Peter van der Zee‏ @kuvos 3 May 2019
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      Replying to @Ghost1240145716

      You're right. I kind of got caught by the unexpected complexity of destructuring. Never really recovered from that :( My first order of business is trying to untangle the difference between what is assignable and destructible. That should clear up return values and some more DRY.

      2 replies 0 retweets 0 likes
    4. Ghost123‏ @Ghost1240145716 3 May 2019
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      Replying to @kuvos

      It seems that your bitmasks are to complex. Use a var that only exist inside func for assign and destruct, and not return them. Then use a local destruct var in methods and set the global destruct value at the end. No need to propagate anything. Half of the bitmasks reduced

      1 reply 0 retweets 0 likes
    5. Peter van der Zee‏ @kuvos 3 May 2019
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      Replying to @Ghost1240145716

      Yeah that's fair. I'm not going to use globals for that if I don't have to but I am looking to simplify that. Struggling a little with the model in my head. Stuff can be destructible, assignable destructible (only), not destructible, assignable, and not assignable.

      3 replies 0 retweets 0 likes
    6. Peter van der Zee‏ @kuvos 3 May 2019
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      Replying to @kuvos @Ghost1240145716

      And there's no immediate 1:1 between assignability and destructiblity. Basically a combination of `{a=b}`, `...a=b`, and `[(a)]` all have different flags. And then there's my foolish quest not to have to backtrack, making yield/await cases difficult. And everything, actually :p

      3 replies 0 retweets 0 likes
    7. Ghost123‏ @Ghost1240145716 4 May 2019
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      Replying to @kuvos

      In your for statement parsing, shouldn't you disallow initializers to properly throw on illegal cases like `for ([] = 0 of {});` ? I'm not sure if it's have any side-effects in your code. And maybe this V8 pull is interesting too? https://github.com/v8/v8/commit/0c879d1cd05446fbbc0993a791c62bd6937beb86#diff-ce94396215214c89b0e7af2f4c8a1e37 …

      2 replies 0 retweets 0 likes
    8. Peter van der Zee‏ @kuvos 4 May 2019
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      Replying to @Ghost1240145716

      Checked the spec, which rule says `let` is illegal in a for-of lhs? Unfortunately the linked commit has no details on this either. I think it's valid in sloppy mode? And "obviously" a keyword in strict mode so illegal there (I tried a few cases and my parser does that correctly?)

      1 reply 0 retweets 0 likes
    9. Ghost123‏ @Ghost1240145716 4 May 2019
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      Replying to @kuvos

      This confuses me too :) But it seems to be related to `let` followed by a member expr, but I can't find it in the specs. It seems like `for (let.x in {}) {}` is valid, but `for (let.x of {}) {}` is not.

      1 reply 0 retweets 0 likes
    10. Peter van der Zee‏ @kuvos 4 May 2019
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      Replying to @Ghost1240145716

      cc @marjakh @mathias Can you shed light on this super important hi prio UBN "but do enjoy the weekend" case? :)

      1 reply 0 retweets 0 likes
      Mathias Bynens‏Verified account @mathias 4 May 2019
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      Replying to @kuvos @Ghost1240145716 @marjakh

      The linked bug in the commit message has the details: https://bugs.chromium.org/p/v8/issues/detail?id=9160 … cc @bakkoting @tverwaes

      7:07 AM - 4 May 2019
      1 reply 0 retweets 0 likes
        1. Peter van der Zee‏ @kuvos 4 May 2019
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          Replying to @mathias @Ghost1240145716 and

          Ahhh, yes. Thank you, both.

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