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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. 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
      Tim Sweeney‏ @TimSweeneyEpic 2 Feb 2019
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      Replying to @SyamaMishra @msuiche

      Consider usage cases like web layout, where DOM has layout rules with semantics, ordering constraints, and deferred update rules few people understand. Wouldn’t it be cleaner to define programming language semantics for dependent variables and subscriptions?

      8:22 PM - 2 Feb 2019
      • 11 Likes
      • inertia :: 慣性 :: かんせい Charlie Cleveland Geu Tris Smith Knox Joseph Chris Murphy M. Eric DeFazio Mike Schweitzer crankycatcoder
      6 replies 0 retweets 11 likes
        1. New conversation
        2. Matt Suiche @ #OPCDE2020‏ @msuiche 2 Feb 2019
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          Replying to @TimSweeneyEpic @SyamaMishra

          You could do that in ReactJS/JavaScript but I really feel adding new semantics would just make things more complicated and create issues. Although, you could already create a new type in UE BluePrints fairly easily and just define a function underneath for more complex operationspic.twitter.com/VFEEW2arsb

          1 reply 0 retweets 4 likes
        3. W. Brian Gourlie‏ @dubya_brian 2 Feb 2019
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          Replying to @msuiche @TimSweeneyEpic @SyamaMishra

          FRP has already gone through the hype cycle, and I have yet see it really stick anywhere yet, basically for the reasons you point out. Good example here: https://elm-lang.org/blog/farewell-to-frp …

          0 replies 0 retweets 1 like
        4. End of conversation
        1. New conversation
        2. crankycatcoder‏ @crankycatcoder 2 Feb 2019
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          Replying to @TimSweeneyEpic @SyamaMishra @msuiche

          I've wondered why react doesn't mandate and propagate global props everywhere without relying on the manual crap.

          1 reply 0 retweets 0 likes
        3. J Wyman‏ @gistofj 2 Feb 2019
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          Replying to @crankycatcoder @TimSweeneyEpic and

          Because some idiot will code z = () => x + y: x = () => z - y; y = () => z - x;

          2 replies 0 retweets 1 like
        4. 1 more reply
        1. Jason Wood‏ @uchian 2 Feb 2019
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          Replying to @TimSweeneyEpic @SyamaMishra @msuiche

          Why wouldn't a programming language implementation have all the same problems? Possibly more because it would have to be generalized?

          0 replies 0 retweets 0 likes
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        1. Krishna “not the saviour kind”‏ @krishnagarlap 2 Feb 2019
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          Replying to @TimSweeneyEpic @SyamaMishra @msuiche

          If this was verilog one would simply say: always @(X or Y) Z = X+Y Hardware behaves exactly like this..any change in inputs automatically shows up at the output.

          0 replies 0 retweets 0 likes
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        1. Dan Moore‏ @toobulkeh 2 Feb 2019
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          Replying to @TimSweeneyEpic @SyamaMishra @msuiche

          That's the trade off, cleaner to define, more difficult to operate. OOO becomes nightmarish.

          0 replies 0 retweets 0 likes
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        1. Knox Joseph‏ @userKnox 2 Feb 2019
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          Replying to @TimSweeneyEpic @SyamaMishra @msuiche

          A language level keyword such as "reactive int i = 10" would be a good idea?

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