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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. Mathias Bynens‏Verified account @mathias 29 Apr 2019
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      Replying to @jaffathecake @sindresorhus @tabatkins

      While single-line comments aren’t officially supported in CSS, they kind of already work in 99% of use cases:https://www.youtube.com/watch?v=KPL-mA77bDo&t=8m30s …

      5 replies 7 retweets 51 likes
    2. Tierney Cyren  🍑‏ @bitandbang 29 Apr 2019
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      Replying to @mathias @jaffathecake and

      now do the same for JSON 😭

      1 reply 0 retweets 2 likes
    3. Ingvar Stepanyan‏ @RReverser 29 Apr 2019
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      Replying to @bitandbang @mathias and

      { "//comment": "done!" }

      1 reply 0 retweets 1 like
    4. Tierney Cyren  🍑‏ @bitandbang 29 Apr 2019
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      Replying to @RReverser @mathias and

      But that way you’re changing the shape of your JSON and if people are parsing it they’ll end up parsing your comments too :(

      1 reply 0 retweets 0 likes
    5. Ingvar Stepanyan‏ @RReverser 29 Apr 2019
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      Replying to @bitandbang @mathias and

      Yeah I know :( I wish we'd just standardise comments on top of JSON, given how widespread they are in certain implementations. There are more ambitious proposals like JSON5, but for now just comments would be enough.

      1 reply 0 retweets 1 like
    6. Ingvar Stepanyan‏ @RReverser 29 Apr 2019
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      Replying to @RReverser @bitandbang and

      > they’ll end up parsing your comments too :( On the other hand: > JSON.parse(`{ "a": 1, "// comment": "done!", "b": 2 }`, (k, v) => k.startsWith('//') ? undefined : v) > { a: 1, b: 2 } Not anymore! (well, kinda)

      1 reply 0 retweets 0 likes
    7. Tierney Cyren  🍑‏ @bitandbang 29 Apr 2019
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      Replying to @RReverser @mathias and

      JSON.parse is already super expensive and you’re just adding to that by including comments in there and requiring the users to parse them and add additional logic to filter them out 😅

      2 replies 0 retweets 0 likes
    8. Mathias Bynens‏Verified account @mathias 29 Apr 2019
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      Replying to @bitandbang @RReverser and

      JSON.parse expensive? Compared to what? +@tverwaes

      2 replies 0 retweets 7 likes
    9. Tierney Cyren  🍑‏ @bitandbang 29 Apr 2019
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      Replying to @mathias @RReverser and

      Specifically bringing Node.js experience - JSON.parse() blocks the event loop which I'm sure you know isn't awesome. I assume (?) this behavior is different in the browser, though.

      1 reply 0 retweets 0 likes
    10. Christopher Hiller‏ @b0neskull 29 Apr 2019
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      Replying to @bitandbang @mathias and

      I’d be surprised if it didn’t block in a browser

      2 replies 0 retweets 1 like
      Mathias Bynens‏Verified account @mathias 29 Apr 2019
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      Replying to @b0neskull @bitandbang and

      It does. There are however optimization opportunities for things like fetch(url).then(response => response.json()) where browsers could do a streaming parse off the main thread.

      8:50 PM - 29 Apr 2019
      • 5 Likes
      • James Milner Alfredo Lopez Ingvar Stepanyan Wes Souza 🏳️‍🌈 Tierney Cyren 🍑
      2 replies 0 retweets 5 likes
        1. New conversation
        2. Sindre Sorhus‏Verified account @sindresorhus 29 Apr 2019
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          Replying to @mathias @b0neskull and

          Has there been any discussions on introducing `JSON.parseAsync()`?

          3 replies 0 retweets 11 likes
        3. Mathias Bynens‏Verified account @mathias 29 Apr 2019
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          Replying to @sindresorhus @b0neskull and

          It comes up from time to time, but no formal proposal yet.

          2 replies 0 retweets 3 likes
        4. 9 more replies
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        2. Bradley Farias‏ @bradleymeck 29 Apr 2019
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          Replying to @mathias @b0neskull and

          Even with this, reifying generally has to happen on main thread :-/ , the big actual advantage is early bailout and incremental parse during free time.

          1 reply 0 retweets 2 likes
        3. Toon Verwaest‏ @tverwaes 30 Apr 2019
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          Replying to @bradleymeck @mathias and

          My (prototype-based) estimate is that you could move 70% of the cost off the main thread for large JSON trees. For simple JSON objects you just double the cost.

          1 reply 0 retweets 2 likes
        4. 1 more reply

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