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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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      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
    2. 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
    3. 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
    4. 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
    5. 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
    6. 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
    7. 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
    8. 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
    9. Mathias Bynens‏Verified account @mathias Feb 8
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      Replying to @BrendanEich @littledan

      Still at stage 2. +@gibson042

      1 reply 0 retweets 2 likes
    10. 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
      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.

      11:16 AM - 8 Feb 2020
      1 reply 0 retweets 0 likes
        1. New conversation
        2. ʕ•̫͡•ʕ•̫͡•ʔ‏ @03d5d0a1 Feb 8
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          Replying to @mathias @BrendanEich and

          FYI the sailboat includes a variation selector. It has no visible impact on the rendering of the grapheme as far as I can tell, so maybe it is a poor example.

          1 reply 0 retweets 1 like
        3. BrendanEich‏Verified account @BrendanEich Feb 8
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          Replying to @03d5d0a1 @mathias and

          Still, I need help writing an example. I used the https://gist.github.com/inexorabletash/8c4d869a584bcaa18514729332300356 … polyfill pasted into node, yet whatever locale I use, spreading grapheme segment iteration results in a length of 6. What is the way to count boats? @mathias, we must give the boaters what they want! :-P

          2 replies 0 retweets 1 like
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