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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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    Mathias Bynens‏Verified account @mathias 3 Jul 2019
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    🤯 JavaScript WeakMaps are not actually weak: they refer strongly to their contents as long as the key is alive. This brings the list of imprecisely-named ECMAScript APIs to: ➡️ Map → OrderedMap ➡️ Set → OrderedSet ➡️ Promise.race → Promise.anySettled ➡️ WeakMap → Ephemeron

    7:45 AM - 3 Jul 2019
    • 105 Retweets
    • 436 Likes
    • vilco Wendel Nascimento Mark Gono Celina Uemura Mariusz Nowak Sagar Matthew otto_xd FUCK V🤮X Jing l malan
    17 replies 105 retweets 436 likes
      1. New conversation
      2.  💖 Taudry Hepburn  💖‏ @tabatkins 3 Jul 2019
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        Replying to @mathias

        Bah, they're plenty weak about the key, it's fine. 😄 But jayzus, Ephemeron would have been a terrible name.

        4 replies 0 retweets 15 likes
      3. Mathias Bynens‏Verified account @mathias 3 Jul 2019
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        Replying to @tabatkins

        IIRC the originally proposed name was in fact EphemeronTable.

        1 reply 0 retweets 3 likes
      4. 1 more reply
      1. New conversation
      2. David Mark Clements‏ @davidmarkclem 3 Jul 2019
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        Replying to @mathias

        I'm now confused about what weak means 😂. What would you have to hypothetically change in WeakMap for it to be weak, and would it be useful functionality?

        2 replies 0 retweets 0 likes
      3. Mathias Bynens‏Verified account @mathias 3 Jul 2019
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        Replying to @davidmarkclem

        It's just that a `WeakMap` only refers weakly to its contents once the key is garbage-collected. Until then, it refers strongly to its contents. `WeakRef`s are the more powerful, truly weak primitive that you really want. cc @ulandeg @mlippautz

        5 replies 0 retweets 10 likes
      4. 3 more replies
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      2. Mateusz Burzyński‏ @AndaristRake 3 Jul 2019
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        Replying to @mathias

        Hm, what would be correct semantics for precisely named Promise.race? 🧐

        2 replies 0 retweets 0 likes
      3. Mathias Bynens‏Verified account @mathias 3 Jul 2019
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        Replying to @AndaristRake

        The name is just not very clear, even within Promise jargon.

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. New conversation
      2. Vihan Bhargava‏ @vihanbh 3 Jul 2019
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        Replying to @mathias

        Maps and sets aren't ordered in JS unless I have a misunderstanding of what you're referring to?

        1 reply 0 retweets 0 likes
      3. Mathias Bynens‏Verified account @mathias 3 Jul 2019
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        Replying to @vihanbh

        They are ordered!

        1 reply 0 retweets 3 likes
      4. 4 more replies
      1. Yehuda Katz  🥨‏Verified account @wycats 3 Jul 2019
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        Replying to @mathias

        Ephemeron would not have been a better name. I'd have preferred SideTable but I was too late in joining TC39.

        0 replies 0 retweets 11 likes
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      2. Jef Poskanzer‏ @jefposk 3 Jul 2019
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        Replying to @mathias

        More reasons for me to stick with ES5.

        1 reply 0 retweets 0 likes
      3. T.J. Crowder‏ @tjcrowder 3 Jul 2019
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        Replying to @jefposk @mathias

        "Many were increasingly of the opinion that they'd all made a big mistake coming down from the trees in the first place, and some said that even the trees had been a bad move, and that no-one should ever have left the oceans." 😀 (meant in gentle good humour)

        1 reply 0 retweets 11 likes
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