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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. Tpol Chico‏ @tpolecat 1 Aug 2018

      Today I learned that (a) you can have default args for polymorphic parameters; and for this reason (b) generated .copy methods can be polymorphic (which they are, which I didn't know); and (c) default args are provided prior to typechecking so you can mess with them.pic.twitter.com/9t4TEqMjNu

      7 replies 40 retweets 149 likes
      Show this thread
    2. ■ numerik‏ @d6 1 Aug 2018
      Replying to @tpolecat

      my reaction to this is the same as it would be to walking in the woods and seeing an exceptionally colorful and dangerous snake

      2 replies 0 retweets 21 likes
    3. Tpol Chico‏ @tpolecat 1 Aug 2018
      Replying to @d6

      I can say without evidence but with great confidence that @propensive has written something that depends on this behavior.

      2 replies 0 retweets 19 likes
      Jon Pretty‏ @propensive 2 Aug 2018
      Replying to @tpolecat @d6

      I experimented with this sort of thing a couple of years ago as part of a hugely hacky HTML library that was part of Rapture, but it had implicits and subtyping (with complex variance) in the mix, but the abstraction was leaky, and overloading screwed up inference.

      3:26 AM - 2 Aug 2018 from Milan, Lombardy
      • 2 Likes
      • Gabriel Bezerra Tpol Chico
      2 replies 0 retweets 2 likes
        1. New conversation
        2. Jon Pretty‏ @propensive 2 Aug 2018
          Replying to @propensive @tpolecat @d6

          But I recently rewrote that library using Dynamic, checked with macros. Not my preferred combination of features, but it became easier for me to reason about, and I'm pretty happy with it now.

          1 reply 0 retweets 2 likes
        3. Felix‏ @felixbr_ 2 Aug 2018
          Replying to @propensive

          You should put "QA-Engineer for the Scala programming language" on your resume.

          0 replies 0 retweets 1 like
        4. End of conversation
        1. Miguel Pérez Pasalodos‏ @Kamugo 2 Aug 2018
          Replying to @propensive @tpolecat @d6

          🤔pic.twitter.com/mjm0qBvtkP

          0 replies 0 retweets 2 likes
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