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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. Matthew Phillips‏ @matthewcp 16 Jul 2019
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      What's the most efficient way to do a String Builder in JS? [].join() vs. str.substr vs. ? Specifically I want to create a string with holes that I plan to fill later of unknown size, is there a way to do with this typed arrays maybe?

      1 reply 0 retweets 2 likes
    2. dominik kundel  🐼 😴‏ @DKundel 16 Jul 2019
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      Replying to @matthewcp

      This seems like a question for @bmeurer or @mathias

      1 reply 0 retweets 2 likes
      Mathias Bynens‏Verified account @mathias 16 Jul 2019
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      Replying to @DKundel @matthewcp @bmeurer

      Mathias Bynens Retweeted Benedikt Meurer

      See https://twitter.com/bmeurer/status/1102452256794906625 …, although there have been some changes in V8 since then. For the holey string use case, a TypedArray doesn’t sound like a bad idea to me (if you’re okay with the overhead of concerting between code points and strings). Can you give more details?

      Mathias Bynens added,

      Benedikt Meurer @bmeurer
      ✍️ Wrote down some findings regarding string concatenation performance in JavaScript. Seems like this is still an area that could use some work. 🤔 🔗 https://bit.ly/fast-string-concatenation-in-javascript … pic.twitter.com/2Mu8VEJG9g
      11:37 AM - 16 Jul 2019
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      • Lotfire ༻ᵏᵘᵐᵃᵛⁱˢ༄༜ Matthew Phillips
      2 replies 0 retweets 3 likes
        1. New conversation
        2. Matthew Phillips‏ @matthewcp 16 Jul 2019
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          Replying to @mathias @DKundel @bmeurer

          I'm parsing a vdom structure and turning it into a string of HTML (a typed array would be fine too). I need to do analysis on the entire thing for optimization, so I need to leave holes. I really need a string#splice equivalent.

          1 reply 0 retweets 0 likes
        3. Matthew Phillips‏ @matthewcp 16 Jul 2019
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          Replying to @matthewcp @mathias and

          I can't use a typed array.fill() because the hole will be filled by either 0 or N items (where N is a known value).

          0 replies 0 retweets 0 likes
        4. End of conversation
        1. Mathias Bynens‏Verified account @mathias 16 Jul 2019
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          Replying to @mathias @DKundel and

          In general though, start with writing code that you think makes sense and is readable. If it’s slower than you’d expect, let us know and file a V8 bug at http://v8.dev/bug !

          0 replies 0 retweets 3 likes
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