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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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      Here's a neat test of programming language expressiveness: Can you write a function PrintXY taking an integer n>=0 that prints all strings of length n containing only the characters 'X' and 'Y'? Can you do it without recursion, and without assuming n<=64? Is it readable?

      83 replies 29 retweets 366 likes
      Show this thread
    2. L.  😷. Ritter‏ @paniq May 26
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      Replying to @TimSweeneyEpic

      eh, jesus christ that one's messy. in scopes i would have to work with vectors of bits, and write a custom adder for this. particularly that `n` can be infinitely big makes this challenge quite awful.

      1 reply 0 retweets 0 likes
    3. L.  😷. Ritter‏ @paniq May 26
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      Replying to @paniq @TimSweeneyEpic

      L.  😷. Ritter Retweeted Tim Sweeney

      and your particular syntax hides the fact that there's an embedded inc by 1 that operates on a buffer of arbitrary size. and what magic is 'X' .. 'Y' supposed to do? what are we returning here? what is the type of those expressions?https://twitter.com/TimSweeneyEpic/status/1265457474510913537 …

      L.  😷. Ritter added,

      Tim Sweeney @TimSweeneyEpic
      New expressive power comes from our ability to nest choices inside of loops, where each iteration explores all choices. Then we can variably "exponentiate", and write PrintXY as: pic.twitter.com/loFkBD2RaC
      Show this thread
      2 replies 0 retweets 0 likes
    4. Tim Sweeney‏ @TimSweeneyEpic May 26
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      Replying to @paniq

      “for(a) do b” produces an array by iterating over each choice of a (possibly binding variables there) and adding the element b (possibly referencing variables in a, and possibly introducing new choice backtracking points upon each iteration).

      2 replies 0 retweets 1 like
    5. Tim Sweeney‏ @TimSweeneyEpic May 26
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      Replying to @TimSweeneyEpic @paniq

      The power of this comes from backtracking being delimited to the domain of the ‘for’. The expression a backtracks and produces new choices in that domain, while the range b contributes its choices to the surrounding context.

      1 reply 0 retweets 1 like
    6. Tim Sweeney‏ @TimSweeneyEpic May 26
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      Replying to @TimSweeneyEpic @paniq

      This particular programming challenge is just a funny example. You could also write if(as[i:int]==3) then... else ..., which binds i to the first element of the array as that equals 3, or takes the else-branch if none. Functional logic gives you finite search everywhere.

      1 reply 0 retweets 2 likes
    7. L.  😷. Ritter‏ @paniq May 26
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      Replying to @TimSweeneyEpic

      sounds more like sugar to me. tbh as a systems programmer, none of these make things particularly clearer to me. i was hoping this multidimensional range building business could be a solution to parallelization semantics that i'm not seeing yet, but it's just hiding a lot.

      1 reply 0 retweets 0 likes
    8. L.  😷. Ritter‏ @paniq May 26
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      Replying to @paniq @TimSweeneyEpic

      like, i don't know how to look at the code above and reason from that what the LLVM IR will look like.

      1 reply 0 retweets 0 likes
    9. L.  😷. Ritter‏ @paniq May 26
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      Replying to @paniq @TimSweeneyEpic

      and i don't even think it's going to execute what you think it will execute... for example where is the "\n" between the "YYNNNYNYN" lines? this one looks like it's either going to print a single "Y" per line, or just one long sequence of Y's and N's

      1 reply 0 retweets 0 likes
      Tim Sweeney‏ @TimSweeneyEpic May 26
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      Replying to @paniq

      This is BASIC style print with a built-in newline. The “result” variable is produced by “for”, so it’s an array with an element for each choice in the domain, with choices being backtracked in sequence: the earliest is the outermost backtrack. An array of characters is a string.

      11:21 PM - 26 May 2020
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      • LeMay L. 😷. Ritter
      2 replies 0 retweets 2 likes
        1. New conversation
        2. Tim Sweeney‏ @TimSweeneyEpic May 26
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          Replying to @TimSweeneyEpic @paniq

          The power here comes from the compositionality of choice, failure, and backtracking to drive looping, searching, and collection formation instead of mutable variable updates or Haskell style higher order functions (sugared by comprehensions).

          1 reply 0 retweets 1 like
        3. Tim Sweeney‏ @TimSweeneyEpic May 26
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          Replying to @TimSweeneyEpic @paniq

          Is it syntactic sugar? No: Even though very simple cases are optimizable down to ordinary loops, the ability to introduce backtrack points, to unify, and fail is can be completely dynamic.

          0 replies 0 retweets 1 like
        4. End of conversation
        1. L.  😷. Ritter‏ @paniq May 27
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          Replying to @TimSweeneyEpic

          ok so how would you change the output from a list of YN-words to a single Y / N per line?

          0 replies 0 retweets 0 likes
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