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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. Gabriele Petronella‏ @gabro27 23 Oct 2018

      Scala pop quiz, what does this print?pic.twitter.com/DlyDsIlHGW

      4 replies 1 retweet 5 likes
      Show this thread
    2. Dale Wijnand‏ @dwijnand 23 Oct 2018
      Replying to @gabro27

      null?

      1 reply 0 retweets 0 likes
    3. Gabriele Petronella‏ @gabro27 23 Oct 2018
      Replying to @dwijnand

      Nope! (but close enough, that was actually my first guess too)

      1 reply 0 retweets 0 likes
    4.  🔴 Lars Hupel‏ @larsr_h 23 Oct 2018
      Replying to @gabro27 @dwijnand

      0

      1 reply 0 retweets 2 likes
    5. Gabriele Petronella‏ @gabro27 23 Oct 2018
      Replying to @larsr_h @dwijnand

      Yup :) And false for `Boolean`, \u0000 for char and null for all references types Gotta love trait initialization!

      2 replies 0 retweets 0 likes
    6. Dale Wijnand‏ @dwijnand 23 Oct 2018
      Replying to @gabro27 @larsr_h

      Right. Primitive null.

      1 reply 0 retweets 0 likes
    7. Gabriele Petronella‏ @gabro27 23 Oct 2018
      Replying to @dwijnand @larsr_h

      ‘Primitive null’ sounds very much like an insult to null, which I approve.

      1 reply 0 retweets 10 likes
    8. Jon Pretty‏ @propensive 24 Oct 2018
      Replying to @gabro27 @dwijnand @larsr_h

      But, did you see that it's finding the implicit in B, not the one in A? You can delete the trait, extends and override and you get the same answer.

      1 reply 0 retweets 1 like
    9. Gabriele Petronella‏ @gabro27 24 Oct 2018
      Replying to @propensive @dwijnand @larsr_h

      Ah, yes of course. I've minimized the example from a real case that happened at work, but it's not as minimal as I thought!

      1 reply 0 retweets 0 likes
    10. Jon Pretty‏ @propensive 24 Oct 2018
      Replying to @gabro27 @dwijnand @larsr_h

      I mean, val a: Int = a is even more minimal!

      2 replies 0 retweets 2 likes
      Jon Pretty‏ @propensive 24 Oct 2018
      Replying to @propensive @gabro27 and

      Incidentally, Scala forces you to explicitly cast a literal null to a (potentially) primitive value since around Scala 2.6. If T is not known to be a subtype of AnyRef, and you give it a Null-typed thing (viz, null), you have to explicitly cast it to T.

      1:31 AM - 24 Oct 2018 from Seville, Spain
      2 replies 0 retweets 0 likes
        1. Miguel Pérez Pasalodos‏ @Kamugo 24 Oct 2018
          Replying to @propensive @gabro27 and

          Just testing, lazy val a: Int = a gets you the result I was expecting at first (StackOverflowError)

          0 replies 0 retweets 2 likes
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        1. Gabriele Petronella‏ @gabro27 24 Oct 2018
          Replying to @propensive @dwijnand @larsr_h

          Ah yes, I was aware of that. Does the cast resolve to a primitive value at runtime, or does it just explode? Meaning: val a: Int = null.asInstanceOf[Int]

          1 reply 0 retweets 1 like
        2.  🔴 Lars Hupel‏ @larsr_h 24 Oct 2018
          Replying to @gabro27 @propensive @dwijnand

          Nope, doesn't explode.

          1 reply 0 retweets 0 likes
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