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dibblego's profile
Tony Morris
Tony Morris
Tony Morris
@dibblego

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Tony Morris

@dibblego

Power ∧ Attitude ⇒ Performance

Brisbane, Australia
tmorris.net
Joined May 2009

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    1. Jed Wesley-Smith‏ @jedws 29 Jan 2019
      Replying to @viktorklang @guizmaii

      what if you’re abstracting over functors?

      1 reply 0 retweets 1 like
    2. P. Oscar Boykin‏ @posco 29 Jan 2019
      Replying to @jedws @viktorklang @guizmaii

      your functor instance has the execution context.

      4 replies 0 retweets 1 like
    3. Jed Wesley-Smith‏ @jedws 30 Jan 2019
      Replying to @posco @viktorklang @guizmaii

      your typeclass instance has mutable state?

      1 reply 0 retweets 0 likes
    4. P. Oscar Boykin‏ @posco 30 Jan 2019
      Replying to @jedws @viktorklang @guizmaii

      Futures are mutable my dude. (e.g. poll). ExecutionContext seems less mutable to me (what mutates there?)

      2 replies 0 retweets 0 likes
    5. Jed Wesley-Smith‏ @jedws 30 Jan 2019
      Replying to @posco @viktorklang @guizmaii

      an ExecutionContext is basically a thread pool, very mutable

      1 reply 0 retweets 0 likes
    6. Vincent Marquez‏ @runT1ME 30 Jan 2019
      Replying to @jedws @posco and

      The problem is the presence or the EC violates the monad laws.

      1 reply 0 retweets 2 likes
    7. P. Oscar Boykin‏ @posco 30 Jan 2019
      Replying to @runT1ME @jedws and

      Which one? Erik has a nice post on this: https://gist.github.com/non/4d1f49fe41e2f12c463ae075bf5d0f06 … — every claim I’ve seen of this involves non-functions. There are totally reasonable non-effectful uses of future for e.g. parallelism that don’t involve non-functions.

      2 replies 0 retweets 5 likes
    8. Vincent Marquez‏ @runT1ME 30 Jan 2019
      Replying to @posco @jedws and

      Functor associativity law. Putting something on a thead pool is potentially“observable” in Scala, so it can break the law.

      1 reply 0 retweets 0 likes
    9. P. Oscar Boykin‏ @posco 30 Jan 2019
      Replying to @runT1ME @jedws and

      Lots of things are observable in scala (e.g. use toString, hashCode, eq). This doesn’t seem like a strong argument to me. This would rule out all kinds of things.

      1 reply 0 retweets 0 likes
    10. Vincent Marquez‏ @runT1ME 30 Jan 2019
      Replying to @posco @jedws and

      Those are different in that they abuse “object”. Even if we had true parametricity in Scala, the EC still breaks the associativity laws, no? 🙂

      2 replies 0 retweets 0 likes
      Tony Morris‏ @dibblego 10 Feb 2019
      Replying to @runT1ME @posco and

      Correct, it does. You don't even need to talk about side-effects to demonstrate that there is no Functor here. It can be improved such that there is, though.

      6:57 PM - 10 Feb 2019
      • 1 Like
      • Jed Wesley-Smith
      0 replies 0 retweets 1 like

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