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qntm's profile
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@qntm

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@qntm

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

qntm.org
Joined September 2009

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    1. quarantine 'em‏ @qntm 21 May 2017
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      Replying to @qntm

      My module shortens "1.476925632985436e99" by 1 character to "1476925632985436e84", eat that, UglifyJS

      1 reply 0 retweets 7 likes
    2. quarantine 'em‏ @qntm 21 May 2017
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      Replying to @qntm

      UglifyJS's approach is a little mystifying. "Maybe the octal representation is shorter!" https://github.com/mishoo/UglifyJS2/blob/569c21e952c99340db73d6ad1c7102500cc1b341/lib/output.js#L1312 …

      1 reply 1 retweet 4 likes
    3. quarantine 'em‏ @qntm 21 May 2017
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      Replying to @qntm

      Whether the hex representation is shorter than the decimal changes several times as numbers get bigger http://stackoverflow.com/questions/9458614/at-what-point-do-hexadecimal-representations-of-numbers-take-up-less-chars-than …

      1 reply 1 retweet 3 likes
    4. quarantine 'em‏ @qntm 21 May 2017
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      Replying to @qntm

      Additionally, there's an incredibly small number of cases where `0xfff...f` represents the same float as `0x1000...0` but saves a character

      1 reply 0 retweets 2 likes
    5. quarantine 'em‏ @qntm 21 May 2017
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      Replying to @qntm

      The same is true in base 10 (i.e. `999...9` represents the same float as `1000...0` but saves a character) but by then you're using `1e21`

      1 reply 0 retweets 2 likes
    6. quarantine 'em‏ @qntm 21 May 2017
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      Replying to @qntm

      Handling numbers in general, not just numeric literals, has far more pitfalls and potential for optimisation

      1 reply 0 retweets 2 likes
    7. quarantine 'em‏ @qntm 21 May 2017
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      Replying to @qntm

      An earlier version of UglifyJS naively replaced `Infinity` with `1/0`, but that turned e.g. `x/Infinity` into `x/1/0`

      1 reply 0 retweets 2 likes
    8. quarantine 'em‏ @qntm 21 May 2017
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      It also replaced `NaN` with `0/0`, turning `x/NaN` (always `NaN`) into `x/0/0` (`Infinity`, `-Infinity`, `NaN`) and SAVING NO CHARACTERS

      2 replies 0 retweets 3 likes
    9. quarantine 'em‏ @qntm 21 May 2017
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      Replying to @qntm

      `1<<17` is shorter than `131072`. `~99` is shorter than `-100`. `1e9-7` is shorter than `999999993`. But when is such a substitution safe?

      3 replies 0 retweets 2 likes
    10. quarantine 'em‏ @qntm 21 May 2017
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      Replying to @qntm

      And it turns out the number crunching to determine the shortest possible expression of an arbitrary float is deep and complicated

      1 reply 0 retweets 1 like
      quarantine 'em‏ @qntm 21 May 2017
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      `.1+.2` is shorter than `0.30000000000000004` but, starting from the latter, how in the WORLD would you get the former?

      2:06 PM - 21 May 2017
      • 3 Likes
      • pavel_lishin Alberto Albero 🌲 Amateur Slacker (Honorary Anime-Profile-Pic-Haver)
      2 replies 0 retweets 3 likes
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        1. quarantine 'em‏ @qntm 21 May 2017
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          Replying to @qntm

          This seems to be a pretty challenging problem even if you assume no usage or declaration of functions in the available space

          1 reply 0 retweets 1 like
        2. quarantine 'em‏ @qntm 21 May 2017
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          Replying to @qntm

          Finding the shortest expression which evaluates to a given float is basically a problem of Kolmogorov complexity (I could be wrong)

          2 replies 0 retweets 2 likes
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        1. Share DVI‏ @ShareDVI 21 May 2017
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          Replying to @qntm

          idk, convert to binary, look into IEEE 754 rounding, perhaps an 'addition table' for the remainder tails can be built for binary-inf fracs

          0 replies 0 retweets 0 likes
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