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oacgnol's profile
toon long
toon long
toon long
@oacgnol

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toon long

@oacgnol

scala gardener @stripe, sweat(shirt/pants) connoisseur. he/him

austin, formerly brooklyn
Joined September 2010

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    1. toon long‏ @oacgnol 13 Sep 2019
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      it came up at work while i was memeing about catamorphisms that they may not necessarily be about smashing a thing down to a smaller thing, e.g. `F[A] => A`. what's a simple example of this? assume i am a baby when it comes to recursion schemes

      3 replies 0 retweets 1 like
    2. Andrew Scott‏ @andygscott 13 Sep 2019
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      Replying to @oacgnol

      Catamorphisms follow structure, so you can rebuild a new (or the same) structure via your fold. Example: List.foldRight to rebuild a new list. You can implement fmap this way in terms of foldRight.

      1 reply 0 retweets 2 likes
    3. Gabriel Claramunt‏ @gclaramunt 13 Sep 2019
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      Replying to @andygscott @oacgnol

      aList.foldRight(Nil)( (x,xs) => f(x) :: xs ) is equivalent to http://aList.map (f)

      1 reply 0 retweets 1 like
    4. Andrew Scott‏ @andygscott 13 Sep 2019
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      Replying to @gclaramunt @oacgnol

      Bingo!

      1 reply 0 retweets 1 like
    5. Gabriel Claramunt‏ @gclaramunt 13 Sep 2019
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      Replying to @andygscott @oacgnol

      Also, if you fold only with the constructors you get the exact thing back ! foldRight(Nil)(_ ::_)

      1 reply 0 retweets 1 like
      toon long‏ @oacgnol 13 Sep 2019
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      Replying to @gclaramunt

      pic.twitter.com/VZvjIPTzIo

      4:09 PM - 13 Sep 2019
      • 1 Like
      • ¿qué pasa, mio?
      1 reply 0 retweets 1 like
        1. Andrew Scott‏ @andygscott 13 Sep 2019
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          Replying to @oacgnol @gclaramunt

          shameless plug showing hylo instead of catapic.twitter.com/wmbVlOlnRX

          0 replies 0 retweets 5 likes
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