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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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    Mathias Bynens‏Verified account @mathias 24 Jan 2018
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    [Poll] What do you get if you add two negative zeroes in JavaScript? -0 + -0 No cheating! #jsquiz

    3:45 PM - 24 Jan 2018
    • 60 Retweets
    • 98 Likes
    • Travis Crumley Rodrigo Fernandes Prafull Gupta KongduinoⓀⓄⓃⒼⒹⓊⒾⓃⓄ⭆⭕𐂃𐦐⭅𓀴𓁶𓄨𓇶⭅ Krzysiek Szymczak Manuel Bautista Angel Eduardo Евгений Малафеев Tarragona 2007
    31 replies 60 retweets 98 likes
      1. Mathias Bynens‏Verified account @mathias 27 Jan 2018
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        Voting has ended! The correct answer is -0, as can be verified using `http://Object.is ()`.pic.twitter.com/FFAQvizEZJ

        const result = -0 + -0;
Object.is(result, -0);
// → true
        5 replies 7 retweets 29 likes
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      1. New conversation
      2. Stuart Langridge‏ @sil 24 Jan 2018
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        Replying to @mathias

        How do you even know what the result is? -0 === +0, so how do you test the result?

        1 reply 0 retweets 0 likes
      3. Mathias Bynens‏Verified account @mathias 24 Jan 2018
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        Replying to @sil

        See http://www.wirfs-brock.com/allen/posts/128  by @awbjs: const isNegative0 = (x) => x === 0 && (1 / x) === -Infinity;

        3 replies 1 retweet 8 likes
      4. 2 more replies
      1. New conversation
      2. Tim Branyen‏ @tbranyen 24 Jan 2018
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        Replying to @mathias

        aren't -0, 0, and +0 all treated the same (answer is probably no), but I'd imagine it's 0

        2 replies 0 retweets 1 like
      3. Mathias Bynens‏Verified account @mathias 25 Jan 2018
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        Replying to @tbranyen

        Not in all cases. http://Object.is (-0, +0); // → false

        0 replies 0 retweets 2 likes
      4. End of conversation
      1. New conversation
      2. Kirk Elliott‏ @dmvjs 24 Jan 2018
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        Replying to @mathias

        +0 === regular old 0 right? I got it correct but it was more confusing with the +.

        1 reply 0 retweets 0 likes
      3. Mathias Bynens‏Verified account @mathias 24 Jan 2018
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        Replying to @dmvjs

        Yes, +0 is just regular 0. I wanted to make it clear it’s different from -0.

        0 replies 0 retweets 2 likes
      4. End of conversation
      1. New conversation
      2. Andreas Bresser‏ @datanonsense 24 Jan 2018
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        Replying to @mathias

        In Opera, Chrome and Firefox it's -0, in Edge its +0. Of course Microsoft does it different!

        3 replies 0 retweets 9 likes
      3. Eli Grey‏ @sephr 24 Jan 2018
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        Replying to @datanonsense @mathias

        Nope, it's -0 in Edge. Try 1/(-0+-0) to see the sign bit

        2 replies 0 retweets 2 likes
      4. 1 more reply
      1. New conversation
      2. brianloveswords‏ @brianloveswords 24 Jan 2018
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        Replying to @mathias

        where's the option for 1

        1 reply 0 retweets 2 likes
      3. Mathias Bynens‏Verified account @mathias 24 Jan 2018
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        Replying to @brianloveswords

        Shit, I forgot to add 420

        2 replies 0 retweets 21 likes
      4. 1 more reply

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