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_pauldale_'s profile
Paul Dale
Paul Dale
Paul Dale
@_pauldale_

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Paul Dale

@_pauldale_

Father. Chef. Musician. Polyglot. Polymath. Polyamor. Queer. He/him.

London
Joined November 2009

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    1. Jon Pretty‏ @propensive Jan 28

      This lesson on Monads was the hardest one I've had to write for http://scala.zone  so far. Without focusing on the finer details (yet) I've tried to get beginners as close as I can to having an intuition for what a monad is (in a fifteen-minute read). https://scala.zone/courses/scala-beginner/fors/monads …pic.twitter.com/DDhBZQukuL

      2 replies 14 retweets 66 likes
      Show this thread
    2. Jon Pretty‏ @propensive Jan 28

      And I'm not sure if I've succeeded. But my approach was to try to avoid drawing any analogy with a particular everyday object (like a burrito) and focus on the types (in particular the flattening operation), because they're really the domain where monads apply.

      2 replies 0 retweets 3 likes
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    3. Jon Pretty‏ @propensive Jan 28

      But a good teacher can be judged on how they explain monads, so I'd like this lesson to be exemplary. If anyone has any suggestions for improvements, I'd love to know!

      3 replies 0 retweets 2 likes
      Show this thread
      Paul Dale‏ @_pauldale_ Jan 28
      Replying to @propensive

      I don’t think I have ever seen a better explanation.

      4:40 AM - 28 Jan 2021
      • 1 Like
      • Jon Pretty
      2 replies 0 retweets 1 like
        1. New conversation
        2. Paul Dale‏ @_pauldale_ Jan 28
          Replying to @_pauldale_ @propensive

          The typical explanation by analogy obfuscates ‚why’. Your explanation targets the why, which is much more useful than topological comparisons.

          1 reply 0 retweets 1 like
        3. Jon Pretty‏ @propensive Jan 28
          Replying to @_pauldale_

          It always struck me that most of the explanations that say "a monad is like an X" would be more correct to say "X has a monad", in which case you might as well use List or Try as examples. And I think that if there were a perfect analogy in the real world, we'd know it by now...

          1 reply 0 retweets 2 likes
        4. Show replies
        1. Paweł Prażak‏ @pawelprazak Jan 28
          Replying to @_pauldale_ @propensive

          I love seeing first principal thinking vs thinking by analogy applied to education, thank you @propensive for your hard work on this!

          0 replies 0 retweets 1 like
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