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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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    1. james padolsey‏ @padolsey 8 Jun 2019
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      Ok I now love iterators and generators. http://Number.prototype.to  = function*(n) { for (let i = +this; i <= n; i++) yield i; } for (let i of 0..to(100)) {...}

      11 replies 53 retweets 243 likes
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    2. james padolsey‏ @padolsey 8 Jun 2019
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      Ok this is horrific but possible: // Loop from 20 to 200 for (let n of 20[200]) {} Pretty sure using a proxy on a native prototype is punishable by death. Please forgive me.https://gist.github.com/padolsey/4c948712e469d7492a346730ebe4ee2b …

      3 replies 5 retweets 28 likes
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    3. Allen Wirfs-Brock‏ @awbjs 8 Jun 2019
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      Replying to @padolsey

      I'd you try 20[200]? The ECMAScript specification says that it should use %NumberPrototype% (ie, the original, builtin value of Number.prototype) rather than the current value of Number.prototype. So it should not be possible to substitute a Proxy into the 20[200] access

      1 reply 0 retweets 1 like
    4. james padolsey‏ @padolsey 8 Jun 2019
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      Replying to @awbjs

      Oddly appears to work (in V8 at least).

      1 reply 0 retweets 0 likes
    5. Mathias Bynens‏Verified account @mathias 8 Jun 2019
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      Replying to @padolsey @awbjs

      Allen, could you clarify what in particular is supposed to use %NumberPrototype% as opposed to (the modified) Number.prototype in this example?

      1 reply 0 retweets 0 likes
    6. Allen Wirfs-Brock‏ @awbjs 8 Jun 2019
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      Replying to @mathias @padolsey

      5.a.ii https://tc39.es/ecma262/#sec-getvalue … https://tc39.es/ecma262/#sec-properties-of-number-instances … "Number prototype object" Defined https://tc39.es/ecma262/#sec-properties-of-the-number-prototype-object … Admittedly not super obvious and ES6 editorial changes unintentionally made it less clear. ES5 spec clearer in this regard

      2 replies 0 retweets 2 likes
    7. Darien MV‏ @bhathos 8 Jun 2019
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      Replying to @awbjs @mathias @padolsey

      Isn’t it still %NumberPrototype% in the above example? The proxy in this example is not Number.prototype, it’s Number.prototype[[Prototype]] (which Get/Has/Set can hit).

      2 replies 0 retweets 1 like
    8. getify‏ @getify 8 Jun 2019
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      Replying to @bhathos @awbjs and

      yeah i think what's being missed in the discussion is that Number.prototype.__proto__ is being changed from Object.prototype to the proxy. That seems... legal.

      1 reply 0 retweets 2 likes
    9. Allen Wirfs-Brock‏ @awbjs 8 Jun 2019
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      Replying to @getify @bhathos and

      Allen Wirfs-Brock Retweeted Allen Wirfs-Brock

      But see @getify tweet up thread fromhttps://twitter.com/awbjs/status/1137398131606163456?s=09 …

      Allen Wirfs-Brock added,

      Allen Wirfs-Brock @awbjs
      Replying to @getify
      OMG, you're right? Still possible via Object.setPrototypeOf even if lookup starts with %NumberPrototype%
      1 reply 0 retweets 2 likes
      Mathias Bynens‏Verified account @mathias 8 Jun 2019
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      Replying to @awbjs @getify and

      Yeah, that’s what I thought too.

      10:04 AM - 8 Jun 2019
      0 replies 0 retweets 0 likes

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