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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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    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?

    8:03 PM - 2 Feb 2019
    • 33 Retweets
    • 334 Likes
    • Dara 🚂 Conan Reis Николай Михеев Fazer Alex Nujas Mr IO Musti der Beste Manus Freedom
    53 replies 33 retweets 334 likes
      1. New conversation
      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. 7 more replies
      1. New conversation
      2. Meng Weng Wong‏ @mengwong 3 Feb 2019
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        Replying to @TimSweeneyEpic

        If I were to do this using the functional idioms already available to me in a largely imperative language, I’d define z = () => x() + y() and let the runtime take care of optimization/ memoization. The idea of a monitor could be abstracted out into a monad covering x and y calls.

        1 reply 0 retweets 0 likes
      3. Tim Sweeney‏ @TimSweeneyEpic 3 Feb 2019
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        Replying to @mengwong

        Yes, that’s another interesting pattern that emerges on top of a transactional memory system: Memoize a function whose sole effect is reading the heap, and cache the dependencies to ensure re-evaluation only if they change.

        0 replies 0 retweets 3 likes
      4. End of conversation
      1. New conversation
      2. Matt Suiche @ #OPCDE2020‏ @msuiche 2 Feb 2019
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        Replying to @TimSweeneyEpic

        You can already simply do: #define z (x+y) Although, with reactive variables, I'd forecast a lot of bugs and security bugs. Int overflow mitigations require to check the result of operation each time it occurs.

        1 reply 0 retweets 4 likes
      3. Syama Mishra‏ @SyamaMishra 2 Feb 2019
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        Replying to @msuiche @TimSweeneyEpic

        Imagine trying to guess in your code which variables are dynamic and which aren't while reading it without having to go back and check their initialization. Nightmare.

        2 replies 0 retweets 4 likes
      4. 3 more replies
      1. New conversation
      2. Sam Swain‏ @ga5p0d3 3 Feb 2019
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        Replying to @TimSweeneyEpic

        Designing data-flow systems/tools I realised that spreadsheets are very much this (mentioned above). I love the 'alternate' programming mindset required. Tends towards a functional model too.

        1 reply 0 retweets 2 likes
      3. Sam Swain‏ @ga5p0d3 3 Feb 2019
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        Replying to @ga5p0d3 @TimSweeneyEpic

        Sam Swain Retweeted Sam Swain

        Have found the data-flow model invaluable for building and iterating on reactive systems like this procgen project:https://twitter.com/ga5p0d3/status/920772026683547654?s=19 …

        Sam Swain added,

        Sam Swain @ga5p0d3
        Random Dungeon Rooms V3; More content, variety, and sub-rooms. Shows changing layout decisions with size. #procgen #Unity3D #gamedev pic.twitter.com/j7NvuctM84
        1 reply 1 retweet 12 likes
      4. 3 more replies
      1. New conversation
      2. LeimyRX‏ @LeimyRX 3 Feb 2019
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        Replying to @TimSweeneyEpic

        I wonder if propagator networks would help here... http://web.mit.edu/~axch/www/phd-thesis.pdf …. It’s been a while since I’ve read that but the idea of “continually improving results with incomplete intermediate results” seems useful in systems that change over time. Maybe not? Maybe?

        2 replies 0 retweets 2 likes
      3. Adam Saleh‏ @salehczk 4 Feb 2019
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        Replying to @LeimyRX @TimSweeneyEpic

        A.f.a.i.k, you'd need some way to ensure the computation will converge, or you will create infinite feedback-loops too easily. Don't they rely on monotone functions in the thesis? Maybe CALM theorem saves us? Last time I was looking at this I hinged several @kmett talks on this:)

        1 reply 0 retweets 1 like
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