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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. getify‏ @getify 14 Feb 2019
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      Replying to @briankardell

      s/named arguments/named parameters :)

      1 reply 0 retweets 1 like
    2. вкαя∂εℓℓ‏ @briankardell 14 Feb 2019
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      Replying to @getify

      Is there an important reason for your distinction here? I was using the terminology from the spec chapter 17 "Unless otherwise specified, this value is equal to the largest number of named arguments..."

      1 reply 0 retweets 0 likes
    3. getify‏ @getify 14 Feb 2019
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      Replying to @briankardell

      This is the commonly accepted distinction between the two terms:pic.twitter.com/u7Ce5hn3O1

      2 replies 0 retweets 4 likes
    4. getify‏ @getify 14 Feb 2019
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      Replying to @getify @briankardell

      Moreover, a "named argument" is a different thing entirely, in that in several languages (Scala, Obj-C, and even idiomatically JS), you can "name your arguments" at the call-site and have those mapped to params. for example: foo(someParam = 3, otherParam = 2);

      1 reply 0 retweets 1 like
    5. getify‏ @getify 14 Feb 2019
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      Replying to @getify @briankardell

      in JS, we do that idiomatically with object literals and object param destructuring: function foo({ someParam, otherParam }) { .. } // named params foo({ otherParam: 2, someParam: 3 }); // named args

      2 replies 0 retweets 4 likes
    6. Mathias Bynens‏Verified account @mathias 14 Feb 2019
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      Replying to @getify @briankardell

      Counterargument: the arguments object

      2 replies 0 retweets 0 likes
    7. getify‏ @getify 14 Feb 2019
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      Replying to @mathias @briankardell

      actually, I think the `arguments` object is a confirmation of these. The `arguments` object/array holds all the values that were passed in as **arguments**. It's a very nuanced and frowned-upon strange'ness that there's a deep reference from the arguments entry to the param.

      2 replies 0 retweets 2 likes
    8. getify‏ @getify 14 Feb 2019
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      Replying to @getify @mathias @briankardell

      I always teach it this way, that the `arguments` array is holding the argument values, irrespective of any params which also might be holding them by name.

      1 reply 0 retweets 1 like
    9. Mathias Bynens‏Verified account @mathias 14 Feb 2019
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      Replying to @getify @briankardell

      That explanation breaks down in the face of the shadowing behavior. function foo(a, b) { a = 9; b = 8; console.log(arguments); } foo(1, 2);

      1 reply 0 retweets 1 like
    10. getify‏ @getify 14 Feb 2019
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      Replying to @mathias @briankardell

      I know about the shadowing and I mentioned it in my earlier tweet ("...deep reference..."). but i think my assertion stands, given that nobody in their right mind uses that intentionally, and strict mode eliminated it. I'd wager > 99% have never even heard of or considered it.

      3 replies 0 retweets 2 likes
      Mathias Bynens‏Verified account @mathias 14 Feb 2019
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      Replying to @getify @briankardell

      And now you have to explain what “deep reference” means. It’s not accurate; it’s not a reference to the original values that were passed, nor to their bindings, as the example shows. Just seems easier to use the terminology that’s in the language instead of mixing things up.

      12:23 PM - 14 Feb 2019
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      • Victor Ribero 🧘🏼‍♂️ Talysson de Oliveira
      1 reply 0 retweets 2 likes
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        2. getify‏ @getify 14 Feb 2019
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          Replying to @mathias @briankardell

          I don't understand what your arguing about here? I used "deep reference" as a quick abbr while tweeting. I don't teach the actual topic at all anymore, as I already said, so what I call it in tweets is not terribly relevant.

          1 reply 0 retweets 0 likes
        3. getify‏ @getify 14 Feb 2019
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          Replying to @getify @mathias @briankardell

          I wouldn't use "shadowing" either, as that is also confusing. Typically "shadowing" is used to describe variables of the same name in different scopes, or properties of the same name on different links in the prototype chain. That's not what this is.

          1 reply 0 retweets 1 like
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