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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. Dale Wijnand‏ @dwijnand 7 Nov 2019

      TIL Option[_] isn't a higher-kinded type. It's just a type constructor. Higher-kinded types are types that abstract over type constructors (so X[F[_]]). As known as 1st order & higher-order abstraction. But best refer to the latter as "type constructor polymorphism".

      5 replies 2 retweets 48 likes
    2. Jon Pretty‏ @propensive 7 Nov 2019
      Replying to @dwijnand

      There isn't any consistency with what people mean when they say "HKT" these days. By most usages, type constructors *are* HKTs. Though, the way you've written it ("Option[_]") is actually just a proper type with kind *, albeit existential. "Option" would be the TC.

      3 replies 0 retweets 5 likes
    3. Dale Wijnand‏ @dwijnand 7 Nov 2019
      Replying to @propensive

      OK, s/Option[_]/Option/ then. But the problem I had with using "Option" is it's also what the companion object (term) is...

      1 reply 0 retweets 0 likes
    4. Jon Pretty‏ @propensive 7 Nov 2019
      Replying to @dwijnand

      Yep, Scala cheats away this ambiguity with context-aware syntax. I'm not sure how best to express the intent of Option *as a type* in prose.

      1 reply 0 retweets 1 like
    5. Tamer Abdulradi‏ @tabdulradi 7 Nov 2019
      Replying to @propensive @dwijnand

      `Option[?]` ? 🤔

      1 reply 0 retweets 3 likes
      Jon Pretty‏ @propensive 7 Nov 2019
      Replying to @tabdulradi @dwijnand

      That's so 2021. ;)

      2:18 PM - 7 Nov 2019
      • 1 Like
      • Dale Wijnand
      1 reply 0 retweets 1 like
        1. New conversation
        1. Dale Wijnand‏ @dwijnand 7 Nov 2019
          Replying to @propensive @tabdulradi

          `Option[🤔]`

          1 reply 0 retweets 5 likes
        2. Jon Pretty‏ @propensive 7 Nov 2019
          Replying to @dwijnand @tabdulradi

          Scala 4. Write a SIP.

          0 replies 0 retweets 2 likes
          3. End of conversation

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