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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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Joined July 2010

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    1. Jon Pretty‏ @propensive Apr 19

      An interesting consequence of Scala 3's context functions is that since the parameter's name isn't chosen at the call site (it's implicit), it's often accessed using a helper method, and that method will have a consistent canonical name across codebases. That helps readability.

      2 replies 4 retweets 21 likes
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    2. Jon Pretty‏ @propensive Apr 19

      For example, imagine an HTTP server's request handler is typed `Request ?=> Response`, so the request object is "given" within its body at the callsite. Defining, def request(using Request) = summon[Request] in the library means the request will always have the name `request`.

      3 replies 0 retweets 6 likes
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    3. Jon Pretty‏ @propensive Apr 19

      Compare that to a "normal" (non-context) function parameter, where one user will write `{ r => ... }`, another will write `{ req => ... }` and another will write `{ httpRequest => ... }`. Any user reading that code needs to learn the parameter name for each use site.

      1 reply 0 retweets 9 likes
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    4. Martin Odersky‏ @odersky Apr 19
      Replying to @propensive

      Good point. The same principle holds for anonymous using clauses + global helper function. Highly recommended!

      1 reply 0 retweets 15 likes
      Jon Pretty‏ @propensive Apr 19
      Replying to @odersky

      In fact, that's exactly how I've been writing tests for the last couple of weeks!pic.twitter.com/GZhr1DVvav

      1:55 PM - 19 Apr 2021
      • 1 Retweet
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      • Kacper Korban Ludovic Claude David Ainslie
      0 replies 1 retweet 3 likes

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