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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. Franziska Hinkelmann, Ph.D.‏ @fhinkel 9 Dec 2018
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      When I don't know that Array.prototype.fill() is a thing https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fill …pic.twitter.com/ccF9V5eNXu

      3 replies 12 retweets 95 likes
    2. Benedikt Meurer‏ @bmeurer 9 Dec 2018
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      Replying to @fhinkel

      There's a tiny difference: the first one creates a packed backing store, whereas the fill() solution creates a holey backing store. May or may not matter though.

      5 replies 0 retweets 5 likes
    3. Kamil Tomšík‏ @cztomsik 10 Dec 2018
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      Replying to @bmeurer @fhinkel

      but Array(n).fill(0).slice() should return packed smis again, right? BTW: isn't better to use typed arrays here? What is the cost of typed arrays?

      1 reply 0 retweets 1 like
    4. Benedikt Meurer‏ @bmeurer 10 Dec 2018
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      Replying to @cztomsik @fhinkel

      I think slice() would also give you holey_smi_elements. This is probably the perfect use case for typed arrays, indeed. cc @mathias

      1 reply 0 retweets 0 likes
    5. Mathias Bynens‏Verified account @mathias 10 Dec 2018
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      Replying to @bmeurer @cztomsik @fhinkel

      Even with slice, it’s still HOLEY in @v8js. To avoid holeyness, start with a (hole-free) array literal and push to it: https://v8.dev/blog/elements-kinds#avoid-creating-holes …pic.twitter.com/6njfYqraE9

      3 replies 2 retweets 12 likes
    6. Sam Saccone‏Verified account @samccone 10 Dec 2018
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      Replying to @mathias @bmeurer and

      🧀[]

      2 replies 0 retweets 5 likes
    7. Mathias Bynens‏Verified account @mathias 10 Dec 2018
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      Replying to @samccone @bmeurer and

      happy to champion your spec proposal

      1 reply 0 retweets 5 likes
    8. Sam Saccone‏Verified account @samccone 10 Dec 2018
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      Replying to @mathias @bmeurer and

      I'm torn between that and Array.from({🧀})

      1 reply 0 retweets 5 likes
    9. Benedikt Meurer‏ @bmeurer 10 Dec 2018
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      Replying to @samccone @mathias and

      📦.with(0)

      1 reply 0 retweets 3 likes
      Mathias Bynens‏Verified account @mathias 10 Dec 2018
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      Replying to @bmeurer @samccone and

      📦.with(NaN) // what computer scientists call “NaN-boxing”

      2:47 AM - 10 Dec 2018
      • 4 Likes
      • Kristofer Baxter Sven Sauleau Sam Saccone Benedikt Meurer
      0 replies 0 retweets 4 likes

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