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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 16 Nov 2019
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      There are really only two types of computations: calculating stuff about an unchanging thing, and calculating a new version of a thing that is changing over time. Recognizing this simplified debate about functional versus imperative programming.

      17 replies 81 retweets 480 likes
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      Tim Sweeney‏ @TimSweeneyEpic 16 Nov 2019
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      If you have an imperative program and can’t identify “the thing”, then the thing is the entire state of your program. To translate that to a functional program, you’d need to plumb the thing into and out of every function in your program.

      8:43 AM - 16 Nov 2019
      • 66 Likes
      • Ruthie Keena ikrima hugo The platonic ideal of a carrot kamil wroniewicz Max DeLiso Nick Saunders Slava Kolobaev 𝒟𝓇 𝒜𝓃𝒹𝓇𝑒𝓌 𝑀𝑜𝓈𝓈
      7 replies 0 retweets 66 likes
        1. New conversation
        2. Tim Sweeney‏ @TimSweeneyEpic 16 Nov 2019
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          This transformation is doable, but the problem is that references inside the original imperative program have to be turned into some sort of representation of the entire path from the top level state object to the thing the reference can be modified.

          2 replies 0 retweets 41 likes
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        3. Tim Sweeney‏ @TimSweeneyEpic 16 Nov 2019
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          Hence I think the sweet spot for large-scale programming is an imperative language with a pure functional subset, not a functional language with imperative plumbing like Haskell monads. Then the beast that needs to be tamed is data races in the shared state concurrency model.

          17 replies 9 retweets 143 likes
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        4. Tim Sweeney‏ @TimSweeneyEpic 16 Nov 2019
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          In an engine, “the thing” is the scene graph. The simulation updates it once per frame based on object interactions. Then perhaps there are several much smaller independent things, like the state of the input system, the network replication system, and so on.

          3 replies 1 retweet 66 likes
          Show this thread
        5. End of conversation
        1. New conversation
        2. Jonathan Blow‏ @Jonathan_Blow 16 Nov 2019
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          Replying to @TimSweeneyEpic

          I think there's a lot of denial about this among functional language advocates, though. Many would claim that you somehow get to a simpler, cleaner program by doing this, and of course it totally doesn't run any slower, and if you don't believe these things, it's because you just

          1 reply 2 retweets 9 likes
        3. Jonathan Blow‏ @Jonathan_Blow 16 Nov 2019
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          Replying to @Jonathan_Blow @TimSweeneyEpic

          don't understand the magic of functional programming. When I think the reality is, look, certain jobs are just about mutating state, and if you pretend they aren't, then you actually just obfuscating the program.

          2 replies 2 retweets 18 likes
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        1. ƆIԀƎ‏ @ovowowovo 16 Nov 2019
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          Replying to @TimSweeneyEpic

          South African servers.

          0 replies 0 retweets 0 likes
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        1. JJ‏ @SilenceOn144Hz 16 Nov 2019
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          Replying to @TimSweeneyEpic

          Okay this is a little to much for my brain but when will there be duos comp again ??🤞🏾

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        1. INDIA MOON‏ @iamindiaxo 16 Nov 2019
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          Replying to @TimSweeneyEpic

          I get it.

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        1. Lionel Barret de N.‏ @LBdN 16 Nov 2019
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          But if you can identify the outline of the "thing", your program is broken from the start anyway, no ? All engineering goes toward having a local identified "thing".

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