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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. Alessandro Lacava‏ @lambdista 4 Sep 2017

      Friendly reminder for Scala developers: type inference for Option.fold suuuuuuuucks. Hilariously that's b/c it's curried, as you can see ->pic.twitter.com/jj7b2c0bib

      2 replies 0 retweets 6 likes
    2. Alessandro Lacava‏ @lambdista 4 Sep 2017

      Well, you're right, probably "strangely" would have been more unambiguous there.

      1 reply 0 retweets 0 likes
    3. Jon Pretty‏ @propensive 4 Sep 2017
      Replying to @lambdista @contrarivariant

      As @contrarivariant says, it's the uncommon case. But the solution is elsewhere: Baz's constructor would be more useful returning a Foo.

      1 reply 0 retweets 0 likes
    4. Alessandro Lacava‏ @lambdista 4 Sep 2017
      Replying to @propensive @contrarivariant

      Definitely. Same for Bar's ctor. But then I could not write: val x = Baz("hello") println(s"${x.a}") Not that I wanna do it, just saying. :)

      1 reply 0 retweets 0 likes
    5. Alessandro Lacava‏ @lambdista 4 Sep 2017
      Replying to @lambdista @propensive @contrarivariant

      Maybe we could propose, as good practice, whenever you have an ADT provide smart ctors in the companion objs returning the parent type. :-)

      2 replies 1 retweet 2 likes
    6. Jon Pretty‏ @propensive 4 Sep 2017
      Replying to @lambdista @contrarivariant

      Yes, I think that's considered "best practice", but it can be a lot of boilerplate that might never be used...

      1 reply 0 retweets 1 like
    7. Jon Pretty‏ @propensive 4 Sep 2017
      Replying to @propensive @lambdista @contrarivariant

      There are different styles, though. http://Foo.bar (...) vs http://Foo.Bar (...) vs just Bar(...).

      2 replies 0 retweets 0 likes
    8. jbgi‏ @jb9i 4 Sep 2017
      Replying to @propensive @lambdista @contrarivariant

      this choice is irritating me every time.

      1 reply 0 retweets 1 like
      Jon Pretty‏ @propensive 4 Sep 2017
      Replying to @jb9i @lambdista @contrarivariant

      You mean you can't decide which to use?

      6:37 AM - 4 Sep 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        1. jbgi‏ @jb9i 4 Sep 2017
          Replying to @propensive @lambdista @contrarivariant

          yeah, every project I contribute to has it own style (not rigorously applied) and I cannot re-enforce my psycho-rigidity on the subject. ;-)

          1 reply 0 retweets 3 likes
        2. Debasish (দেবাশিস্) Ghosh  🇮🇳‏ @debasishg 4 Sep 2017
          Replying to @jb9i @propensive and

          I usually add smart constructors when I have to comply with inferencing :-)

          1 reply 0 retweets 1 like
        3. Show replies

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