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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. 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

      17 replies 105 retweets 436 likes
    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
      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

      8:21 AM - 3 Jul 2019
      • 10 Likes
      • vilco Ivan Bunčić _sean of who Hugo David Wo Patrick Smith Paul Melero Rob Palmer Joe Savona
      5 replies 0 retweets 10 likes
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        2. koush‏Verified account @koush 3 Jul 2019
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          Replying to @mathias @davidmarkclem @mlippautz

          Weak references can be constructed with weak maps. I am fairly sure weak maps *are* the lower level implementation, since this pattern also exists in java.pic.twitter.com/HeYCe5Y1qd

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

          That example leaks, though. The point of WeakRefs is that you can keep `weakreference` around forever without preventing its target from being garbage-collected.

          1 reply 0 retweets 1 like
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        2. Shu-yu Guo (郭纾宇)‏ @_shu 3 Jul 2019
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          Replying to @mathias @davidmarkclem @mlippautz

          WeakRefs are often too powerful though. WeakMaps really should continue to be used for use cases where they are sufficient

          1 reply 0 retweets 5 likes
        3. Mathias Bynens‏Verified account @mathias 3 Jul 2019
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          Replying to @_shu @davidmarkclem @mlippautz

          Definitely. I’m not hating on WeakMaps — just on their name 🤓

          0 replies 0 retweets 3 likes
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        2. Daniel C-137‏ @pubkeypubkey 3 Jul 2019
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          Replying to @mathias @davidmarkclem @mlippautz

          The reason why the proposal for weakPointers was not implemented is, that in javascript you shell not be allowed to detect when the garbage collector has run. This was argumented as security measurement. Just FYI

          1 reply 0 retweets 1 like
        3. Daniel C-137‏ @pubkeypubkey 3 Jul 2019
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          Replying to @pubkeypubkey @mathias and

          In node there is a hack for weak pointers as native plugin btw.

          0 replies 0 retweets 0 likes
        4. End of conversation
        1. Francis Avila‏ @favila 3 Jul 2019
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          Replying to @mathias @davidmarkclem @mlippautz

          WeakMaps have one use case: keeping library-specific metadata on mutable objects it does not control (usually a DOM node). I remember needing that all the time in the jQuery era of webdev (when I could rarely use it!); not so much in the React era.

          0 replies 0 retweets 0 likes
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        1. phillip kerman‏ @phillip 3 Jul 2019
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          Replying to @mathias @davidmarkclem @mlippautz

          I've just always known weak to be about garbage collection. Is this the only language that uses weak this way? Even if it was, I'm not sure the name is all that bad. Your replacement for race is spot on though.

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