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wycats's profile
Yehuda Katz 🥨
Yehuda Katz 🥨
Yehuda Katz  🥨
Verified account
@wycats

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Yehuda Katz  🥨Verified account

@wycats

Tilde Co-Founder, OSS enthusiast and world traveler.

Portland, OR
yehudakatz.com
Joined August 2007

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    1. Benedikt Meurer‏ @bmeurer 25 Dec 2017
      Replying to @littledan @wycats and

      Due to the dynamic nature of JavaScript this could be quite costly in general. You'd have to do secondary lookups on each "affected" property access in scope. Also this will be fun to spec with eval/with/Function.

      1 reply 0 retweets 1 like
    2. Yehuda Katz  🥨‏Verified account @wycats 25 Dec 2017
      Replying to @bmeurer @littledan and

      I think we'd want to define it so that the extensions "win" and can't be changed. This would mean that if you get a hit by the time you're JITing, you can rely on the hit remaining stable.

      1 reply 0 retweets 0 likes
    3. Benedikt Meurer‏ @bmeurer 25 Dec 2017
      Replying to @wycats @littledan and

      That's a minor thing. You still need to intercept every o.x because of could be one of these prototypes (assuming that x was listed in the extensions). And even worse every o[k] because k could evaluate to a property key in the extension list.

      1 reply 0 retweets 2 likes
    4. Benedikt Meurer‏ @bmeurer 25 Dec 2017
      Replying to @bmeurer @wycats and

      Not saying it's not doable, but it comes at a cost.

      1 reply 0 retweets 1 like
    5. Daniel Ehrenberg‏ @littledan 26 Dec 2017
      Replying to @bmeurer @wycats and

      Something in common among the other languages I amdon't aware of which support extensions is that they can be resolved more or less statically

      2 replies 0 retweets 1 like
    6. Yehuda Katz  🥨‏Verified account @wycats 26 Dec 2017
      Replying to @littledan @bmeurer and

      Right. I think if we did this we would want very static resolution. I think that's a fair constraint.

      1 reply 0 retweets 1 like
    7. Yehuda Katz  🥨‏Verified account @wycats 26 Dec 2017
      Replying to @wycats @littledan and

      Incidentally, Ruby's "refinements", which are this feature, are pretty static but could have been more static (and would have been better for it).

      1 reply 0 retweets 1 like
    8. Benedikt Meurer‏ @bmeurer 26 Dec 2017
      Replying to @wycats @littledan and

      Static sounds good from the VMs perspective. Not sure how useful that is in the JavaScript world tho. 🤔

      1 reply 0 retweets 0 likes
    9. Yehuda Katz  🥨‏Verified account @wycats 26 Dec 2017
      Replying to @bmeurer @littledan and

      If it's not static, it becomes very hard to understand. I participated a lot in the Ruby version of this conversation and became very convinced that the feature is more useful when static because it can be understood more easily.

      1 reply 0 retweets 5 likes
    10. Benedikt Meurer‏ @bmeurer 26 Dec 2017
      Replying to @wycats @littledan and

      I can't really speak to that since I don't have the same background as you have, but I find your argument very convincing. 👍

      1 reply 0 retweets 1 like
      Yehuda Katz  🥨‏Verified account @wycats 26 Dec 2017
      Replying to @bmeurer @littledan and

      In cases where user intuitions align with implementation considerations, you can build some awesome shit that isn't slow. I love finding those corners.

      8:15 AM - 26 Dec 2017
      • 1 Retweet
      • 5 Likes
      • Serena Fritsch Donald Pipowitch Robert DeLuca Stefan Penner Benedikt Meurer
      1 reply 1 retweet 5 likes
        1. New conversation
        2. Stefan Penner‏ @stefanpenner 26 Dec 2017
          Replying to @wycats @bmeurer and

          Constraints are liberating!

          2 replies 0 retweets 2 likes
        3. Yehuda Katz  🥨‏Verified account @wycats 26 Dec 2017
          Replying to @stefanpenner @bmeurer and

          They can be yeah!

          0 replies 0 retweets 1 like
        4. End of conversation

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