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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 May 26
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      There is generally a barrier to reading these solutions. In one case you have to run through the behavior of imperative code in your head to understand what it does. In another you have to understand the near magical incantation of pointfree function compositions.

      6 replies 0 retweets 44 likes
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    2. Justin Le‏ @mstk May 27
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      Replying to @TimSweeneyEpic

      not sure if you are referring to this one in particular, but I don't believe there is much about this that is "point-free" -- aside from one arguable case (using `print` instead of `(\n -> print n)`). Point free is always a stylistic choice and never actually a requirement :)

      1 reply 0 retweets 1 like
    3. Justin Le‏ @mstk May 27
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      Replying to @mstk @TimSweeneyEpic

      I do agree that point-free code can be very unreadable, but you can usually get the same expressiveness with fully pointful code -- and @tikhonjelvis 's solution is a shining example 😊

      1 reply 0 retweets 2 likes
    4. Justin Le‏ @mstk May 27
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      Replying to @mstk @TimSweeneyEpic @tikhonjelvis

      In this case the main barrier might be the "lingo", but it can be clearer if we name the components: allLengthN n = replicateM n "XY" printAll things = traverse_ print things main = printAll (allLengthN 128)

      1 reply 1 retweet 2 likes
    5. Tim Sweeney‏ @TimSweeneyEpic May 27
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      Replying to @mstk @tikhonjelvis

      My brain has a hard time following this style. Am I alone? At every step of this I have to think about what arguments are being plumbed in the course of passing one higher order function to another.

      2 replies 0 retweets 2 likes
    6. Tikhon Jelvis‏ @tikhonjelvis May 27
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      Replying to @TimSweeneyEpic @mstk

      I've found it requires a slightly different mindset. It took me some time programming Haskell until I started mentally trusting that—if things compiled—they were wired together correctly. After that, the mental burden of this style of code became *lower* than more explicit code.

      1 reply 0 retweets 2 likes
    7. Tikhon Jelvis‏ @tikhonjelvis May 27
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      Replying to @tikhonjelvis @TimSweeneyEpic @mstk

      When I wrote the little snippet—or when I wrote something more complicated like a Prolog interpreter in Haskell—I had a good time exactly *because* I wasn't thinking through what was going on step by step.

      1 reply 0 retweets 2 likes
    8. Tikhon Jelvis‏ @tikhonjelvis May 27
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      Replying to @tikhonjelvis @TimSweeneyEpic @mstk

      Instead, it's a bit like putting together legos or something. I know that I need this piece, which requires these two other pieces, then I need to sprinkle in some backtracking (which is handled by lists, since those are lazy). Then it either typechecks or I fix it.

      1 reply 0 retweets 2 likes
    9. Tikhon Jelvis‏ @tikhonjelvis May 27
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      Replying to @tikhonjelvis @TimSweeneyEpic @mstk

      I actually think there's something fundamentally interesting about programming here—Haskell got me to think about code in a categorically different way, but it took some time. It was like 50% learning to program in a totally new way.

      2 replies 0 retweets 2 likes
    10. Kris Nuttycombe‏ @nuttycom May 27
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      Replying to @tikhonjelvis @TimSweeneyEpic @mstk

      Not only that, but for me it was a process of transition- I feel like I’ve actually gotten worse at imperative reasoning as I’ve gotten better at functional programming. Or is it that I was always lousy at imperative reasoning, but after learning FP I noticed it more?

      4 replies 1 retweet 6 likes
      Tim Sweeney‏ @TimSweeneyEpic May 27
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      Replying to @nuttycom @tikhonjelvis @mstk

      The prevalence of undiscovered bugs in complex imperative code is astonishingly high. In functional code, it’s lower. Uncaught bugs usually reside in rare edge cases, and Haskell solutions generally have “fewer edges”, and zero mutation order edges.

      7:59 PM - 27 May 2020
      • 4 Likes
      • Deterministic Finite Automaton Castro Kris Nuttycombe Justin Le Tikhon Jelvis
      2 replies 0 retweets 4 likes
        1. New conversation
        2. Tikhon Jelvis‏ @tikhonjelvis May 27
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          Replying to @TimSweeneyEpic @nuttycom @mstk

          Haha, I love the idea of measuring "the number of edges" in my code. I've never thought about it in exactly those terms.

          1 reply 0 retweets 5 likes
        3. Kris Nuttycombe‏ @nuttycom May 27
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          Replying to @tikhonjelvis @TimSweeneyEpic @mstk

          I've given a number of talks about thinking about the size of the state space that your program represents, which is adjacent. Minimizing the state space such that only valid states are representable makes every "edge case" an expected state.

          1 reply 0 retweets 3 likes
        4. 1 more reply
        1. New conversation
        2. GameKH‏ @MasterTores May 27
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          Replying to @TimSweeneyEpic @nuttycom and

          Hello mr.sweeney, i just wanted to know if the epic is planning on delivering all of the features in the future development segment in the trello roadmap before the end of the year. I know developing these things takes time and i would understand if epic isn’t able to do that.

          1 reply 0 retweets 0 likes
        3. GameKH‏ @MasterTores May 27
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          Replying to @MasterTores @TimSweeneyEpic and

          But i just wanted to know if the internal plan is to deliver them before the end of 2020. sorry for being off subject but i just had to ask. its very important for us users to know about things like this and the trello roadmap doesn't really tell us much

          0 replies 0 retweets 0 likes
        4. End of conversation

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