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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. ʕ•̫͡•ʕ•̫͡•ʔ‏ @03d5d0a1 Feb 8
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      @brendaneich In JavaScript, the following creates an array of four items because the sailboat has a variation selector, forming (I think) a grapheme cluster. Can this behavior be made more intuitive? [...🛥⛵️🚤].length === 4 //true

      1 reply 1 retweet 6 likes
    2. BrendanEich‏Verified account @BrendanEich Feb 8
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      Replying to @03d5d0a1

      No, it can’t change as written. (Don’t break the web.) JS like Java and Win32 date from the mid-‘90s when 16 bits were considered enough for Unicode. Before the Astral Planes, and the sailboats...

      1 reply 0 retweets 1 like
    3. ʕ•̫͡•ʕ•̫͡•ʔ‏ @03d5d0a1 Feb 8
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      Replying to @BrendanEich

      Understood. But given the spread syntax was introduced in ~2015 I would have expected it to "gather the characters" together more intuitively. It looks like three boat characters, but "JavaScript" tells me there are four items. Water under bridge. Wondering about future APIs.

      1 reply 0 retweets 0 likes
    4. BrendanEich‏Verified account @BrendanEich Feb 8
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      Replying to @03d5d0a1

      I wrote “as written” because we cannot change string iteration (DBTW). But we are already living in the future: https://github.com/tc39/proposal-intl-segmenter/blob/master/README.md …

      1 reply 0 retweets 3 likes
    5. BrendanEich‏Verified account @BrendanEich Feb 8
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      Replying to @BrendanEich

      (Spread can’t select nonstandard iterator, but you can. Tagging @mathias @littledan to rewrite your example as I am on phone!)

      1 reply 0 retweets 2 likes
    6. ʕ•̫͡•ʕ•̫͡•ʔ‏ @03d5d0a1 Feb 8
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      Replying to @BrendanEich @mathias @littledan

      Oh OK. Thanks for the explanation.

      1 reply 0 retweets 0 likes
    7. ʕ•̫͡•ʕ•̫͡•ʔ‏ @03d5d0a1 Feb 8
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      Replying to @03d5d0a1 @BrendanEich and

      But didn't the spread operator introduce a new method of iterating strings that was more "unicode compliant" (Unicode codepoints, not graphemes I suppose)? If so DBTW seems moot, given it was new behavior in 2015?

      1 reply 0 retweets 0 likes
    8. Mathias Bynens‏Verified account @mathias Feb 8
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      Replying to @03d5d0a1 @BrendanEich @littledan

      ES2015 introduced `String.prototype[Symbol.iterator]` which iterates over Unicode code points (as opposed to UCS-2/UTF-16 code units, which is how JS indexes strings). Spreading a string just uses that iterator.

      2 replies 0 retweets 1 like
    9. Mathias Bynens‏Verified account @mathias Feb 8
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      Replying to @mathias @BrendanEich @littledan

      You’re right that we could’ve chosen something else than “iterate over code points” back then — but iterating over grapheme clusters (cfr. Intl.Segmenter) is locale-dependent, and thus not a great fit for a general-purpose mechanism in the language.

      1 reply 0 retweets 2 likes
    10. BrendanEich‏Verified account @BrendanEich Feb 8
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      Replying to @mathias @littledan

      What is the status of Intl.Segmenter? I don't see it in Node 10.16.3, for example. Thanks.

      2 replies 0 retweets 1 like
      Mathias Bynens‏Verified account @mathias Feb 8
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      Replying to @BrendanEich @littledan

      Still at stage 2. +@gibson042

      9:50 AM - 8 Feb 2020
      • 2 Likes
      • Vlad Harb BrendanEich
      1 reply 0 retweets 2 likes
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        2. BrendanEich‏Verified account @BrendanEich Feb 8
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          Replying to @mathias @littledan @gibson042

          So how would you rewrite the boats example in the original tweet? What locale to use? [... new Intl.Segmenter('en', {granularity: 'grapheme'}).segment('🛥⛵️🚤'].length

          1 reply 0 retweets 4 likes
        3. Mathias Bynens‏Verified account @mathias Feb 8
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          Replying to @BrendanEich @littledan @gibson042

          I don’t think segmentation of these emoji is particularly locale-specific.

          1 reply 0 retweets 0 likes
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