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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.

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propensive.com
Joined July 2010

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    1. Jon Pretty‏ @propensive 6 Jan 2020

      A cautionary tale: not all TreeSets are equal, but some are more equal than others.pic.twitter.com/mMC4bVJFwe

      6 replies 4 retweets 28 likes
    2.  ⏰  🛩️ like an  🏹.  🍓 🍒 🍎  🦟s like a  🍌 🔰‏ @ioupal 6 Jan 2020
      Replying to @propensive

      What's going on here? Did you look under the hood?

      1 reply 0 retweets 0 likes
    3. Jon Pretty‏ @propensive 6 Jan 2020
      Replying to @ioupal @iouwon

      I didn't need to look... what it's doing is as reasonable as what I'm doing is unreasonable: the Ordering I created considers there to be no difference in order between two Foos with the same id. The logic inside TreeSet uses that to equality-of-order to infer equality.

      2 replies 0 retweets 0 likes
    4. Jon Pretty‏ @propensive 6 Jan 2020
      Replying to @propensive @iouwon

      In terms of efficiency, that's a reasonable thing to do because the Ordering and an equals method may both be expensive and should probably do the same thing.

      1 reply 0 retweets 0 likes
    5. Jon Pretty‏ @propensive 6 Jan 2020
      Replying to @propensive @iouwon

      But in my real-world use-case I was exploiting this as a convenient way of guaranteeing I never had two elements with the same ID in the same TreeSet (and giving the TreeSet's append method "replace semantics" for free).

      1 reply 0 retweets 0 likes
    6.  ⏰  🛩️ like an  🏹.  🍓 🍒 🍎  🦟s like a  🍌 🔰‏ @ioupal 6 Jan 2020
      Replying to @propensive

      It feels like that should be done by passing in an alternative equals rather than order Feels weird to me

      1 reply 0 retweets 0 likes
      Jon Pretty‏ @propensive 6 Jan 2020
      Replying to @ioupal @iouwon

      I went with a four-line fix which special-cases TreeSet in a pattern match for the one equality check I care about this for. I'm not entirely happy with the solution, but it works.

      2:26 PM - 6 Jan 2020
      • 1 Like
      • ⏰ 🛩️ like an 🏹. 🍓🍒🍎 🦟s like a 🍌🔰
      1 reply 0 retweets 1 like
        1.  ⏰  🛩️ like an  🏹.  🍓 🍒 🍎  🦟s like a  🍌 🔰‏ @ioupal 6 Jan 2020
          Replying to @propensive

          No issues with that

          0 replies 0 retweets 0 likes
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