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TimSweeneyEpic's profile
Tim Sweeney
Tim Sweeney
Tim Sweeney
@TimSweeneyEpic

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Tim Sweeney

@TimSweeneyEpic

Epic Games founder & CEO

epicgames.com
Joined August 2013

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    1. ShriramKrishnamurthi‏ @ShriramKMurthi 3 Oct 2018
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      Replying to @ShriramKMurthi @rplevy and

      In particular, inasmuch as it's meant to be some kind of characteristic of Lispy syntaxes, their definitions never actually exclude the languages that (I know) their gut tells them are not homoiconic. In other words, I call BS. »

      1 reply 0 retweets 3 likes
    2. ShriramKrishnamurthi‏ @ShriramKMurthi 3 Oct 2018
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      Replying to @ShriramKMurthi @rplevy and

      I wouldn't at all be irritated if someone just said "we have quote and eval and you don't". Those are just true statements. But when people trot out a ten dollar word like HOMOICONIC, they're trying to snow others under. Then they better be RIGHT. »

      2 replies 1 retweet 3 likes
    3. Tim Sweeney‏ @TimSweeneyEpic 3 Oct 2018
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      Replying to @ShriramKMurthi @rplevy and

      Yes, the magic of these languages is in quote/unquote or quasiquote/unquote, which add expressive power in the form of abstraction over syntax. Exposing these constructs in non-LISP language syntaxes shows that code-as-data isn't particular to LISP syntax.

      1 reply 0 retweets 1 like
    4. Dmitri ☭‏ @yogthos 3 Oct 2018
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      Replying to @TimSweeneyEpic @ShriramKMurthi and

      I think the key difference is that with Lisp s-exps you're using a single language because the code is expressed using literal data structure notation. Other syntaxes require an additional metalanguage for this.

      1 reply 0 retweets 0 likes
    5. ShriramKrishnamurthi‏ @ShriramKMurthi 3 Oct 2018
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      Replying to @yogthos @TimSweeneyEpic and

      JavaScript. (At least give an answer that hasn't already been addressed!)

      1 reply 0 retweets 0 likes
    6. Dmitri ☭‏ @yogthos 3 Oct 2018
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      Replying to @ShriramKMurthi @TimSweeneyEpic and

      What's Js equivalent to this? (defmacro catch-error [& code] `(try ~@code (catch Exception e#)))

      2 replies 0 retweets 1 like
    7. Tim Sweeney‏ @TimSweeneyEpic 3 Oct 2018
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      Replying to @yogthos @ShriramKMurthi and

      That ` looks a lot like a quoted string and that ~ looks a lot like string interpolation, so if that eval ran at compile-time on constexpr string data and caught errors statically...

      2 replies 0 retweets 1 like
    8. Jeremie Pelletier‏ @Lambda_Coder 3 Oct 2018
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      Replying to @TimSweeneyEpic @yogthos and

      The big idea is "defmacro" itself; same form as a function definition, but extending the compiler instead of the program. You then get the full language power at compile-time; ` and ~@ are just sugar for list manipulations. You can hack the language itself in your application.

      2 replies 0 retweets 2 likes
    9. Tim Sweeney‏ @TimSweeneyEpic 3 Oct 2018
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      Replying to @Lambda_Coder @yogthos and

      Yes! Point is: There’s an ismorphism (though a super crappy one) between JavaScript string concatenation and eval, and LISP quasiquote/unquote. After all, they’re both one-way: once data is evaled into code, it can’t go back.

      2 replies 0 retweets 1 like
    10. Dmitri ☭‏ @yogthos 3 Oct 2018
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      Replying to @TimSweeneyEpic @Lambda_Coder and

      Sure, but that's a separate point from the fact that in Lisp I'm transforming structured data, while I'm cobbling strings together in Js. Imagine implementing something like this https://github.com/clojure/core.logic … using Js approach. There's a qualitative difference here.

      1 reply 0 retweets 0 likes
      Tim Sweeney‏ @TimSweeneyEpic 3 Oct 2018
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      Replying to @yogthos @Lambda_Coder and

      Agreed. Given the isomorphism (ability to transform either representation losslessly to the other), the differences are performance and aesthetics. LISP beats JS but there’s probably a more optimal answer using traditional syntax.

      5:52 PM - 3 Oct 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. ShriramKrishnamurthi‏ @ShriramKMurthi 3 Oct 2018
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          Replying to @TimSweeneyEpic @yogthos and

          I don't know why we're arguing aesthetics. I never brought up or disputed aesthetics. I'm one of the people behind @racketlang for goodness sake! And I built the original Racket s-exp and macro system. Being 'splained on these topics by paren newbies is pretty hilarious. »

          2 replies 0 retweets 1 like
        3. ShriramKrishnamurthi‏ @ShriramKMurthi 3 Oct 2018
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          Replying to @ShriramKMurthi @TimSweeneyEpic and

          I asked for a DEFINITION of h11y. I've gotten a bunch of non-definitions, definitions-that-don't-define-the-right-set, "then you tell me how"s, etc. And now we've shifted the goalposts completely to "how well would you do string concats". Funny! »

          1 reply 0 retweets 0 likes
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