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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. Gabriel Gonzalez‏ @GabrielG439 6 Jun 2017

      Gabriel Gonzalez Retweeted Matt "summoning arachnogods" Olson

      This is exactly why I prefer Monoid over Semigroup. Having a law-abiding identity eliminates all sorts of corner caseshttps://twitter.com/carnivorous8008/status/871924374567231488 …

      Gabriel Gonzalez added,

      Matt "summoning arachnogods" Olson @carnivorous8008
      Replying to @carnivorous8008
      Hah, just realized what would've broken if I'd stopped at semigroup Heaven help ppl who do this 1 special-case at a time. Ohai legacy code!
      4 replies 6 retweets 43 likes
    2. Stephen Celis‏ @stephencelis 6 Jun 2017
      Replying to @GabrielG439

      Doesn’t it depend on context? Aren’t there instances where semigroups can also eliminate edge cases? E.g.: Validation (NonEmpty String) a

      1 reply 0 retweets 2 likes
    3. Gabriel Gonzalez‏ @GabrielG439 7 Jun 2017
      Replying to @stephencelis

      I don't have a good answer for the case of Validation

      1 reply 0 retweets 0 likes
    4. Tony Morris‏ @dibblego 7 Jun 2017
      Replying to @GabrielG439 @stephencelis

      It's the Applicative (Validation e) instance, originally in the paper gives Monoid e => which is problematic, and amended to Semigroup e =>

      2 replies 0 retweets 0 likes
    5. Stephen Celis‏ @stephencelis 7 Jun 2017
      Replying to @dibblego @GabrielG439

      Sorry I figured @GabrielG439 was familiar. It makes me wonder if there is a dual preference for Semigroup for where he prefers Monoid.

      3 replies 0 retweets 0 likes
    6. Kris Nuttycombe‏ @nuttycom 7 Jun 2017
      Replying to @stephencelis @dibblego @GabrielG439

      Seems to me that preference shouldn't enter into it. Either that extra state should be representable, or not.

      1 reply 1 retweet 1 like
    7. Tony Morris‏ @dibblego 7 Jun 2017
      Replying to @nuttycom @stephencelis @GabrielG439

      ^ This person agrees. Why can't I use do-notation on (Writer (NonEmptyList x)) in Haskell ? I can even with Scala, and that's Scala!

      2 replies 0 retweets 2 likes
    8. Gabriel Gonzalez‏ @GabrielG439 7 Jun 2017
      Replying to @dibblego @nuttycom @stephencelis

      This is analogous to arguing "Why can't I use goto?" Sometimes forbidding functionality improves the code

      1 reply 0 retweets 1 like
      Tony Morris‏ @dibblego 7 Jun 2017
      Replying to @GabrielG439 @nuttycom @stephencelis

      I'm not using that argument. There is no code that improves by the non-existence of Semigroup (or Monoid or any other appropriate thing).

      9:12 PM - 7 Jun 2017
      • 1 Like
      • Jake McArthur
      1 reply 0 retweets 1 like
        1. New conversation
        1. Gabriel Gonzalez‏ @GabrielG439 7 Jun 2017
          Replying to @dibblego @nuttycom @stephencelis

          I disagree. I've worked with code that needlessly proliferated corner cases due to weakening Monoid to Semigroup

          2 replies 0 retweets 0 likes
        2. Kris Nuttycombe‏ @nuttycom 7 Jun 2017
          Replying to @GabrielG439 @dibblego @stephencelis

          I'd love an example of this. How do you get more corner cases when you can represent fewer states? I don't get it.

          1 reply 0 retweets 2 likes
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