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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. Zach Leatherman  🌄‏ @zachleat 7 Dec 2017
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      I’m super not embarrassed to admit that I just learned: ES6 arrow functions do not have their own `this`. They inherit `this` for free without having to do `.bind` or `self = this`. 👍

      7 replies 18 retweets 113 likes
    2. Mathias Bynens‏Verified account @mathias 7 Dec 2017
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      Replying to @zachleat

      The same thing goes for `arguments`, `super`, and `http://new.target ` 👍🏻 Those, and `this`, are not special-cased or anything — it’s just that arrow functions don’t create a new function scope.

      2 replies 2 retweets 14 likes
    3. getify‏ @getify 7 Dec 2017
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      Replying to @mathias @zachleat

      uhhh... arrow functions definitely create a scope. they don't, however, have their own execution context (aka `this`).

      3 replies 0 retweets 3 likes
    4. Mathias Bynens‏Verified account @mathias 7 Dec 2017
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      Replying to @getify @zachleat

      Sure, but not a function scope.

      3 replies 0 retweets 0 likes
    5. getify‏ @getify 7 Dec 2017
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      Replying to @mathias @zachleat

      what do you mean? it's a function, and it has a scope. i don't understand the distinction you're trying to make.

      1 reply 0 retweets 1 like
    6. Mathias Bynens‏Verified account @mathias 7 Dec 2017
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      Replying to @getify @zachleat

      function foo() { // This kind of scope. }

      1 reply 0 retweets 0 likes
    7. getify‏ @getify 7 Dec 2017
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      Replying to @mathias @zachleat

      foo = () => { // this is the same kind of scope, right? // what's missing are some identifiers like `this`, `super`, etc };

      1 reply 0 retweets 1 like
      Mathias Bynens‏Verified account @mathias 7 Dec 2017
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      Replying to @getify @zachleat

      That’s what I mean. IMHO it’s just easier to think of it the other way around instead of remembering those four exceptions.

      2:17 PM - 7 Dec 2017
      1 reply 0 retweets 0 likes
        1. getify‏ @getify 7 Dec 2017
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          Replying to @mathias @zachleat

          ahhh... ok... now i get your meaning. thanks.

          0 replies 0 retweets 0 likes
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