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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. D ␣ a ␣ n ␣ P ␣ i ␣ p ␣ o ␣ n ␣ i‏ @sigfpe May 26
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      @bbcmicrobot 10@%=0 15DEPTH=6 20DIMI(DEPTH) 30K=0 40FORI(K)=0TO1 50K=K+1 60IFK<=DEPTH G.40 70FORL=0TODEPTH 80PRINTI(L); 90N. 100P. 110K=K-1 120N. 130K=K-1 140G.120

      3 replies 0 retweets 9 likes
    2. BBC Micro  🦉 bot‏ @bbcmicrobot May 26
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      Replying to @sigfpe

      pic.twitter.com/V9jdd4prHE

      1 reply 1 retweet 1 like
    3. D ␣ a ␣ n ␣ P ␣ i ␣ p ␣ o ␣ n ␣ i‏ @sigfpe May 26
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      Replying to @bbcmicrobot

      This demonstrates an unusual BBC Micro programming technique. It allows you to nest a bunch for FOR loops as deep as you like controlled by DEPTH (as far as stack allows). This is an example of something you can do with an interpreter but not a compiler.

      3 replies 3 retweets 23 likes
    4. Ian Holmes‏ @ianholmes May 26
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      Replying to @sigfpe @bbcmicrobot

      This made my day, thanks (part of me wants to quibble that you could in fact do something damn near it with a compiler for a proper functional language like Scheme, but that part is a killjoy and needs to relax)

      1 reply 0 retweets 2 likes
      Tim Sweeney‏ @TimSweeneyEpic May 26
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      Replying to @ianholmes @sigfpe @bbcmicrobot

      Oh wow awesome! So that interpreter maintains an internal dynamic stack of for loops, closer to a functional logic language’s nested backtrack forks than to a traditional compiler’s static loop branching.

      11:42 PM - 26 May 2020
      • 2 Retweets
      • 5 Likes
      • Mark Needham Boltzmann Brain Think Tank eudoxia° Chief Quarantine Officer Noidsworth 🦠 BBC Micro 🦉 bot
      1 reply 2 retweets 5 likes
        1. New conversation
        2. D ␣ a ␣ n ␣ P ␣ i ␣ p ␣ o ␣ n ␣ i‏ @sigfpe May 27
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          Replying to @TimSweeneyEpic @ianholmes @bbcmicrobot

          I hadn't thought of it that way. A NEXT behaves a bit like Prolog's "fail".

          2 replies 0 retweets 2 likes
        3. Tim Sweeney‏ @TimSweeneyEpic May 27
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          Replying to @sigfpe @ianholmes @bbcmicrobot

          Functional logic can be so much simpler than Prolog! Just augment a functional language with failure (instead of Boolean False producing functions), unification (it’s the same as equality comparison), choice, if/for to cut and collect delimited choices.

          2 replies 0 retweets 0 likes
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