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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. Tim Sweeney‏ @TimSweeneyEpic 2 Feb 2019
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      Reactive programming is powerful, but often overlooked due to obscure syntax. Given int x,y,z; we can write z=x+y for immediate assignment. What if we could also write z~=x+y to ensure z is recalculated formulaically whenever x or y change, plus when(z) {..} to monitor changes?

      53 replies 33 retweets 334 likes
    2. Per Vognsen‏ @pervognsen 2 Feb 2019
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      Replying to @TimSweeneyEpic

      Probably fine in a language that handles value changes over time rigorously rather than as arbitrary side effects but it seems like a death trap for imperative programming; it'd still be useful in that setting too, but you'd want it to stand out and be applied very carefully.

      1 reply 0 retweets 4 likes
    3. Per Vognsen‏ @pervognsen 2 Feb 2019
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      Replying to @pervognsen @TimSweeneyEpic

      I think one thing we've learned over the past few decades is that even single-threaded event-driven/callback-driven/asynchronous programming is almost as hard to reason about as general concurrency problems and should be avoided whenever possible.

      3 replies 0 retweets 10 likes
    4. Tim Sweeney‏ @TimSweeneyEpic 2 Feb 2019
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      Replying to @pervognsen

      Perhaps this only looks like data-race-prone callbacks because of loose legacy practices. What if we were writing straightforward constraint equations, such as between a table’s overall widths, column widths, and column width percentages, and the system magically synced them?

      2 replies 0 retweets 5 likes
    5. Per Vognsen‏ @pervognsen 2 Feb 2019
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      Replying to @TimSweeneyEpic

      I think auto-updated value expressions/dataflow programming is a great idea. The tension is at the boundaries between the dataflow world and the anything-goes imperative world (your 'when' statement for value-change event handlers).

      1 reply 0 retweets 4 likes
    6. Per Vognsen‏ @pervognsen 2 Feb 2019
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      Replying to @pervognsen @TimSweeneyEpic

      Actually, not just 'when' statements but anything that can occur in a dataflow value expression that isn't "reactively referentially transparent" i.e. depends on or affects things outside the otherwise simple dataflow world.

      2 replies 0 retweets 1 like
    7. Per Vognsen‏ @pervognsen 2 Feb 2019
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      Replying to @pervognsen @TimSweeneyEpic

      That's why I'd be worried about air dropping this kind of feature into a language with unrestricted side effects or (if side effects are unrestricted) without a strong cultural bias against side effects.

      1 reply 0 retweets 1 like
    8. Tim Sweeney‏ @TimSweeneyEpic 2 Feb 2019
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      Replying to @pervognsen

      Agreed, purity makes this more predictable. There you may have cyclic dependencies causing divergence, but no other observable ordering problems.

      2 replies 0 retweets 1 like
      Tim Sweeney‏ @TimSweeneyEpic 2 Feb 2019
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      Replying to @TimSweeneyEpic @pervognsen

      Generally I think this is the ultimate logical extension of a language with Haskell-style IORef pointers and futures. For persistence, pointer reads must be able to go load stuff. For GC compaction, pointers need the ability to forward. Most of the plumbing is already needed.

      8:56 PM - 2 Feb 2019
      1 reply 0 retweets 0 likes
        1. Vesa Karvonen‏ @VesaKarvonen 3 Feb 2019
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          Replying to @TimSweeneyEpic @pervognsen

          In addition to reactive programming / observables, you might want to look at self-adjusting computation. See: http://www.umut-acar.org/self-adjusting-computation … https://blog.janestreet.com/incrementality-and-the-web/ … Simple incremental computation can be done using observables by not propagating equal values.

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