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propensive's profile
Jon Pretty
Jon Pretty
Jon Pretty
@propensive

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Jon Pretty

@propensive

Supporting Scala through professional training and open-source software. Responsible for Magnolia, Fury, Scala World and Functional Africa.

Europe
propensive.com
Joined July 2010

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    1. Jon Pretty‏ @propensive 16 Jul 2020

      100 brown-eyed and 100 blue-eyed perfect logicians live on an island, but none knows the color of their own eyes. There are no mirrors on the island, and communicating is forbidden. If any of them works out the color of their eyes, they must leave the island in the night.

      8 replies 12 retweets 40 likes
      Show this thread
    2. Jon Pretty‏ @propensive 16 Jul 2020

      One day a visitor comes to the island and says, "I see at least one person with blue eyes". What happens next? The surprising result is that nothing happens for a hundred days, then all the blue-eyed people leave, and the next night all the brown-eyed people leave.

      7 replies 0 retweets 2 likes
      Show this thread
    3. Rúnar‏ @runarorama 16 Jul 2020
      Replying to @propensive

      It’s indeed counterintuitive, as the visitor provides no new information! Everyone already knows there’s at least one person with blue eyes.

      1 reply 0 retweets 3 likes
    4.  🔴 🔴 🔴 Martin‏ @martinpallmann 16 Jul 2020
      Replying to @runarorama @propensive

      Everybody knows that there are at least 99 people with blue eyes.

      3 replies 0 retweets 0 likes
    5. Maße↓sz Górski‏ @gorski_mt 16 Jul 2020
      Replying to @martinpallmann @runarorama @propensive

      I thought that @propensive wrote in another tweet that inhabitants of the island don't know the exact numbers. I think it only matters in this particular example that there's equal amount of people with each color and after `n` days one group leaves.

      1 reply 0 retweets 0 likes
    6. Maße↓sz Górski‏ @gorski_mt 16 Jul 2020
      Replying to @gorski_mt @martinpallmann and

      So it might as well be: there's `n` people with brown, `n` with blue and after `n` days the brown ones left.

      1 reply 0 retweets 0 likes
      Jon Pretty‏ @propensive 16 Jul 2020
      Replying to @gorski_mt @martinpallmann @runarorama

      There are several framings of the problem, but (I think) the number of brown-eyed people isn't significant, other than to emphasise the even probabilities of the eye-color of any person chosen at random.

      8:37 AM - 16 Jul 2020 from Krakow, Poland
      0 replies 0 retweets 0 likes

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