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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. Konrad ‘ktoso’ Malawski  🏴‍☠️ 🐟‏ @ktosopl 24 May 2019

      Hm no… can’t remember

      1 reply 0 retweets 1 like
      Show this thread
    2. Jon Pretty‏ @propensive 24 May 2019
      Replying to @ktosopl

      How about try?

      2 replies 0 retweets 1 like
    3. Jon Pretty‏ @propensive 24 May 2019
      Replying to @propensive @ktosopl

      It was certainly a question @djspiewak came up with for a Scala Days quiz one year... I have a feeling there might be another, though... I'm AFK. Do multiple returns parse?

      1 reply 0 retweets 1 like
    4. Konrad ‘ktoso’ Malawski  🏴‍☠️ 🐟‏ @ktosopl 24 May 2019
      Replying to @propensive @djspiewak

      lol, they do. This one I had not known I think, weird one :-)

      1 reply 0 retweets 0 likes
    5. Jon Pretty‏ @propensive 24 May 2019
      Replying to @ktosopl @djspiewak

      Haha. Does a "return expression" typecheck as Nothing, then?

      1 reply 0 retweets 0 likes
    6. Jakub Kozłowski‏ @kubukoz 24 May 2019
      Replying to @propensive @ktosopl @djspiewak

      That'd be weird, you could actually return a Nothing value, wouldn't you?

      1 reply 0 retweets 1 like
    7. Jon Pretty‏ @propensive 24 May 2019
      Replying to @kubukoz @ktosopl @djspiewak

      Well, plenty of other stuff typechecks as Nothing: - ??? - throw YourFavoriteException - def f: Nothing = f - yourFavoriteValue.asInstanceOf[Nothing] None of them really *return* Nothing, though...

      1 reply 0 retweets 1 like
    8. Jakub Kozłowski‏ @kubukoz 24 May 2019
      Replying to @propensive @ktosopl @djspiewak

      Indeed, that's what I was going for - it'd be super weird if `return notNothing` typechecked as Nothing and kot throw :D

      1 reply 0 retweets 0 likes
    9. Jon Pretty‏ @propensive 24 May 2019
      Replying to @kubukoz @ktosopl @djspiewak

      But, to the typechecker, return is equivalent to an exception. I think it was even implemented under the hood by throwing an exception and catching it at the method boundary in early versions of Scala. (Maybe it still is!)

      1 reply 0 retweets 1 like
    10. Jakub Kozłowski‏ @kubukoz 24 May 2019
      Replying to @propensive @ktosopl @djspiewak

      Sure, I just meant the case in which you'd actually be able to "hold" a Nothing

      1 reply 0 retweets 1 like
      Jon Pretty‏ @propensive 24 May 2019
      Replying to @kubukoz @ktosopl @djspiewak

      Give me a Nothing and I'll be happy to hold it! ;)

      3:23 AM - 24 May 2019
      • 3 Likes
      • Sinisa Louc Gabriel Claramunt Jakub Kozłowski
      1 reply 0 retweets 3 likes
        1. New conversation
        1. Jakub Kozłowski‏ @kubukoz 24 May 2019
          Replying to @propensive @ktosopl @djspiewak

          Give me Nothing or give me def

          1 reply 0 retweets 3 likes
        2. Jon Pretty‏ @propensive 24 May 2019
          Replying to @kubukoz @ktosopl @djspiewak

          In this world Nothing can be said to be certain, except def syntaxes.

          0 replies 2 retweets 3 likes
          3. End of conversation

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