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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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Joined July 2010

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    1. Jon Pretty‏ @propensive 17 Mar 2020

      Here's a Scala 3 feature suggestion: I'd like to write for-comprehensions which know their generator type, like so: for[List] { x <- xs y <- ys } yield ... It would make it much easier to work out whether `xs` or `ys` is the wrong type.

      11 replies 7 retweets 92 likes
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    2. Chris Hodapp‏ @clhodapp 18 Mar 2020
      Replying to @propensive

      That could also give you a target for doing codegen on if's that appear before the first generator! And (if we are really going crazy), for zero-generator for comprehensions!

      1 reply 0 retweets 1 like
      Jon Pretty‏ @propensive 18 Mar 2020
      Replying to @clhodapp

      You mean `for[F] yield x` would give `F.unit(x)`? I admire your ambition! And this syntax even looks nice!

      3:57 PM - 18 Mar 2020
      1 reply 0 retweets 0 likes
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        2. Chris Hodapp‏ @clhodapp 18 Mar 2020
          Replying to @propensive

          Exactly. You could even do `for[F] { if x > 10 } yield 3`, which actually cleans up something that is currently kind of messy.

          1 reply 0 retweets 1 like
        3. Jon Pretty‏ @propensive 18 Mar 2020
          Replying to @clhodapp

          The compiler would need to know how to construct the value without an existing value to work from, so it would need to infer the companion object from the TC, and call `unit` on it, which would need to be added to all the monad types.

          1 reply 0 retweets 0 likes
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