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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Zach Brogan  💾‏ @zbrogz 19 Jun 2018
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      Zach Brogan  💾 Retweeted Hector Martin

      I feel even more justified for not being a big fan of JavaScript:https://twitter.com/marcan42/status/1008999468492918784 …

      Zach Brogan  💾 added,

      Hector Martin @marcan42
      Yet another JS WTF. JS uses 64-bit floats for numbers, but it *lies* when displaying them. 0x4000000000000000 is 4611686018427387904 and is *perfectly* represented as a float. But JS renders it as 4611686018427388000, because that has fewer significant digits in decimal?! pic.twitter.com/xbYbqMP9mY
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    3. Zach Brogan  💾‏ @zbrogz 19 Jun 2018
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      Replying to @JustFineWolfie

      Also, I’m not saying I don’t use JavaScript, I most certainly do. It is useful and ubiquitous, but I don’t think it’s the most eloquent, intuitive, or technically accurate language.

      0 replies 0 retweets 0 likes
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    7. Zach Brogan  💾‏ @zbrogz 19 Jun 2018
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      Replying to @JustFineWolfie

      You make some valid points, but in regards to technical accuracy, I was specifically agreeing with the original tweet referenced in this thread.

      0 replies 0 retweets 1 like
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    9. Zach Brogan  💾‏ @zbrogz 19 Jun 2018
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      Replying to @JustFineWolfie

      I think you're actually right about JS following IEEE754-2008 correctly: @marcan42 take a look at this part of the spec.pic.twitter.com/7JmxfJremN

      1 reply 0 retweets 1 like
      Hector Martin‏ @marcan42 19 Jun 2018
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      Replying to @zbrogz

      JS doesn't define H like that, in fact it has a method where you can specify the precision and then it actually will give you all the digits. It's not a limitation, just broken default behavior. But honestly, 754 is extremely vague about character sequences.

      9:06 PM - 19 Jun 2018
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        1. Hector Martin‏ @marcan42 19 Jun 2018
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          Replying to @marcan42 @zbrogz

          It's so vague that on paper, sure, it probably meets it. But my main point is that if the output looks like an integer (no decimal point or 'e') then it's not a text representation of a float at all, but of its integer value, and then you'd better have all the digits.

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        1. Zach Brogan  💾‏ @zbrogz 19 Jun 2018
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          Replying to @marcan42

          Oh I agree. It’s super vague. It doesn’t even provide examples or anything. And I also agree that python’s implementation, for example, makes way more sense.

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        2. BrendanEich‏Verified account @BrendanEich 19 Jun 2018
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          Replying to @JustFineWolfie @marcan42 @zbrogz

          http://kurtstephens.com/files/p372-steele.pdf … http://sources.freebsd.org/RELENG_5/src/contrib/gdtoa/dtoa.c …

          0 replies 0 retweets 1 like
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