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qntm's profile
quarantine 'em
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@qntm

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quarantine 'em

@qntm

I created the Antimemetics Division. http://scp-wiki.wikidot.com/antimemetics-division-hub …

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Joined September 2009

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    1. quarantine 'em‏ @qntm 6 Feb 2019
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      Weirdly, the value returned by `143 ** 143` - i.e. the new, experimental exponentiation operator - is closer to the precise result than that returned from ancient stalwart `Math.pow`pic.twitter.com/YuWf3TJC6N

      6 replies 1 retweet 27 likes
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    2. quarantine 'em‏ @qntm 8 Feb 2019
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      OK so I think what's happening is that when V8 interprets an exponentiation expression dynamically (e.g. `x ** x`) it drops through to `Math.pow`, but when it sees a constant exponentiation expression (e.g. `99 ** 99`) it computes the result inline using a different routine?pic.twitter.com/akoTkZi4Ag

      2 replies 1 retweet 33 likes
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    3. quarantine 'em‏ @qntm 8 Feb 2019
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      The inline routine has the advantage of returning the correct answer, whereas `Math.pow` evidently has some kind of bug

      1 reply 0 retweets 12 likes
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    4. quarantine 'em‏ @qntm 8 Feb 2019
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      Furthermore, the inline routine seems to be in use for integers only, so it's not possible to simply retire `Math.pow`'s current (faulty) implementation and use the inline exponentiation dealie insteadpic.twitter.com/HCQuj6Ex5B

      1 reply 0 retweets 11 likes
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    5. quarantine 'em‏ @qntm 8 Feb 2019
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      I imagine the separate integer exponentiation routine was hand-written for performance gains over calling `Math.pow` in certain scenarios

      2 replies 0 retweets 9 likes
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    6. quarantine 'em‏ @qntm 8 Feb 2019
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      Try this, kids at home! (V8 only AFAIK so Chrome or Node.js)pic.twitter.com/cFB2pWFRlA

      5 replies 28 retweets 82 likes
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    7. Surma‏ @DasSurma 9 Feb 2019
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      Replying to @qntm

      WAT? cc @mathias @bmeurer

      1 reply 0 retweets 5 likes
    8. Mathias Bynens‏Verified account @mathias 9 Feb 2019
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      Replying to @DasSurma @qntm @bmeurer

      Simpler repro: const x = 99; console.log(x ** x - 99 ** 99); It’s fixed in @v8js master. See https://bugs.chromium.org/p/v8/issues/detail?id=5848 ….

      2 replies 3 retweets 27 likes
    9. Surma‏ @DasSurma 9 Feb 2019
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      Replying to @mathias @qntm and

      Ah interesting. I was just surprised that the loop suddenly changes evaluates differently with i = 13k ^^ Thanks for chiming in :D

      2 replies 0 retweets 3 likes
    10. Thad Humphries‏ @johnthad 9 Feb 2019
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      Replying to @DasSurma @mathias and

      Nothing in Chrome 72.0.3626.96 but 8939 in Canary 74.0.3694.0 (Mac). console.log(x ** x - 99 ** 99) is undefined and -5.311379928167671e+182 respectively. (Such quirks are priceless.)

      1 reply 0 retweets 1 like
      quarantine 'em‏ @qntm 9 Feb 2019
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      Replying to @johnthad @DasSurma and

      If you're trying this is in Chrome's developer tools here on a Twitter page, please note that Twitter replaces `console.log` with an empty function. Ran into this myself. That might be why you're seeing `undefined`

      5:46 AM - 9 Feb 2019
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      • simple complex Lie algebra Tucker Leavitt Rahul Sethi Samuel Bierwagen Rémi -Tek' Thad Humphries Mathias Bynens
      2 replies 1 retweet 7 likes
        1. Thad Humphries‏ @johnthad 9 Feb 2019
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          Replying to @qntm @DasSurma and

          Ah, that's it. Thanks.

          0 replies 0 retweets 1 like
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        1. nokko‏ @ennui_of_nokko 17 Feb 2019
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          Replying to @qntm @johnthad and

          Wait, why? Twitter?

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