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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. Lukas‏ @lukas81298 8 Aug 2019
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      Ich hasse Javascript mehr als Pizza ohne Käse!

      5 replies 0 retweets 34 likes
    2. Scrummer‏ @scrummerlp 8 Aug 2019
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      Replying to @lukas81298

      Sometimes I just want to yell "Fuck this", but I can't remember what "this" refers to...

      2 replies 0 retweets 7 likes
    3. Lukas‏ @lukas81298 8 Aug 2019
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      Replying to @scrummerlp

      Herr JS Profi, könnten Sie mir bitte erklären, wie ich den Variablenwert in den Scope dort hole? 🙏pic.twitter.com/R98nWOUQYf

      1 reply 0 retweets 2 likes
    4. S. A. Dir‏ @falschesmodell 8 Aug 2019
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      Replying to @lukas81298 @scrummerlp

      for (var i = 0; i < 20; i++) { (function (j) { setTimeout(function() { console.log(j); }, 1000); })(i); }

      1 reply 0 retweets 0 likes
    5. Lukas‏ @lukas81298 8 Aug 2019
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      Replying to @falschesmodell @scrummerlp

      Danke, aber das bestätigt gerade nur, dass JS kacke ist xD

      1 reply 0 retweets 1 like
    6. Scrummer‏ @scrummerlp 8 Aug 2019
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      Replying to @lukas81298 @falschesmodell

      Jup das ist leider der einzige (möglichst simple) Weg. Andere möglichkeit wäre den Timeout auszulagern und den i zu übergeben. Aber ist halt leider so :/ Unser Bruder @BrendanEich muss da echt los...

      1 reply 0 retweets 2 likes
    7. BrendanEich‏Verified account @BrendanEich 8 Aug 2019
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      Replying to @scrummerlp @lukas81298 @falschesmodell

      Use `let` not `var`. I your brother worked hard to help get this into ES6, where it means that each iteration has its own binding environment, so the closure works as you want it to. Guten Abend!

      5 replies 6 retweets 46 likes
    8. Tim Sweeney‏ @TimSweeneyEpic 8 Aug 2019
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      Replying to @BrendanEich @scrummerlp and

      I didn’t realize that. So JavaScript declaration-site distinctions between let and var are the analog of C++ lambda-site distractions between capture by variable or by value.

      3 replies 0 retweets 5 likes
    9. Tim Sweeney‏ @TimSweeneyEpic 8 Aug 2019
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      Replying to @TimSweeneyEpic @BrendanEich and

      Of languages supporting mutability, only Haskell IORef t and ML t ref are voodoo-free in this tegard. There, identifiers are always bound to constants, and references must be explicitly read and written.

      3 replies 0 retweets 3 likes
    10. Tim Sweeney‏ @TimSweeneyEpic 8 Aug 2019
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      Replying to @TimSweeneyEpic @BrendanEich and

      This highlights that in an imperative language, the default loop form should be something like “for(i in 1 to 10) ...” with the semantic that each iteration has a distinct x binding, and no need to explain away why the i’s before and after the i++ are different i’s.

      1 reply 0 retweets 6 likes
      Patrick Walton‏ @pcwalton 8 Aug 2019
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      Replying to @TimSweeneyEpic @BrendanEich and

      i.e. C-style for loops are bad. I’ve been saying this to everyone who will listen for years. :)

      5:43 PM - 8 Aug 2019
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      3 replies 0 retweets 8 likes
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        2. Wes‏ @weskerfoot 8 Aug 2019
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          Replying to @pcwalton @TimSweeneyEpic and

          isn't this also about by-value vs. by-reference closure conversion? I find it confusing that JS has both.

          1 reply 0 retweets 0 likes
        3. BrendanEich‏Verified account @BrendanEich 8 Aug 2019
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          Replying to @weskerfoot @pcwalton and

          No, this isn't about that. Do you mean JS has both reference (object) and primitive (null undefined boolean number string) types? Thank Java for that one :-/. "Make it look like Java!"

          2 replies 0 retweets 2 likes
        4. 3 more replies
        1. BrendanEich‏Verified account @BrendanEich 8 Aug 2019
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          Replying to @pcwalton @TimSweeneyEpic and

          Yes, for(;;) in combination with ++/-- is a bug rainforest.

          0 replies 0 retweets 5 likes
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        1. Sankrant Chaubey‏ @snk_xed 9 Aug 2019
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          Replying to @pcwalton @TimSweeneyEpic and

          What are other kinds of loops in imperative languages? I am aware of loop construct in lisp. How are modern range based loops different from C style loops?

          0 replies 0 retweets 0 likes
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