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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 19 Jul 2020

      Ok, without checking, what do you think happens? (List(0): Seq[Int]) match { case _: List[Int] => 1 case _ => 2 }

      8 replies 4 retweets 9 likes
    2. Nicolas Rinaudo‏ @NicolasRinaudo 19 Jul 2020
      Replying to @propensive

      Even more fun, what do you think happens: (Seq(0): Seq[Int]) match { case _: List[Int] => 1 case _ => 2 }

      2 replies 0 retweets 1 like
    3. Jon Pretty‏ @propensive 19 Jul 2020
      Replying to @NicolasRinaudo

      The same, presumably...? ;)

      1 reply 0 retweets 5 likes
    4. Nicolas Rinaudo‏ @NicolasRinaudo 19 Jul 2020
      Replying to @propensive

      It does, but your answer makes me feel I've missed something obvious - it seemed less intuitive to me that the runtime type of Seq(1) was List than that of List(1)...

      1 reply 0 retweets 0 likes
    5. Jon Pretty‏ @propensive 19 Jul 2020
      Replying to @NicolasRinaudo

      Yes, you would need to know the specific implementation of `Seq#apply`... which is somewhat arbitrarily a `List`.

      2 replies 0 retweets 0 likes
    6. Nicolas Rinaudo‏ @NicolasRinaudo 19 Jul 2020
      Replying to @propensive

      I must have missed the point of your poll, sorry - thought you wanted to show ways in which Scala could behave confusingly, but my attempt at one-upping you seems to have confused exactly one person, myself :/

      1 reply 0 retweets 1 like
      Jon Pretty‏ @propensive 19 Jul 2020
      Replying to @NicolasRinaudo

      Judging from the split of the votes, you're not the only one confused! ;)

      2:12 PM - 19 Jul 2020 from Krakow, Poland
      • 1 Like
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      0 replies 0 retweets 1 like

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