#racket on 2020-07-16 — irc logs at freenode.irclog.whitequark.org

2020-05-03 17:48 samth changed the topic of #racket to: Racket v7.7 has been released: https://blog.racket-lang.org/2020/05/racket-v7-7.html -- Racket -- https://racket-lang.org -- https://pkgs.racket-lang.org -- Paste at http://pasterack.org

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01:17 <m455> does anyone know how ot pattern match with definitions?

01:17 <m455> let me get an example lol

01:21 <m455> https://gist.github.com/m455/fef51f9f5d9907f2f8e311747f72557b

01:27 <m455> i've been busting my brains to try and get this working with quasi quotes and all other ridiculous stuff haha.

01:27 <m455> i can write predicates for all the definitions, but in my original code i have a lot of definitions

01:27 <m455> using a cond also works but that kind of defeats the purpose of the (match ...) haha

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01:35 <m455> i guess i'll leave this here too: https://github.com/m455/rodo/commit/40e8dc46b97cf9201090b97bf4c616ffc8d892e2#diff-4c8facad02394472d2e28d3476de8f73L263

01:35 <rudybot> https://teensy.info/0ZuSMOHURe

01:35 <m455> that was my old definition and my new one. still pretty messy lol

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13:07 <samth> m455: you probably want `match-define`

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13:19 <m455> samth: ouuu thanks i'll look into that procedure. :D

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13:24 <m455> hmm it doesn't look like that would work in my context, because i need to check for multiple patterns (i'm using it to practice parsing command line arguments)

13:24 <samth> I don't understand how it would work to only sometimes define things

13:29 <m455> i'm testing against multiple patterns, you can see my old and new commit here: https://github.com/m455/rodo/commit/40e8dc46b97cf9201#diff-4c8facad02394472d2e28d3476de8f73L262 in the first example i hardcoded the strings in the patterns, then in the second example i tried using definitions, but it got ugly haha

13:29 <m455> basically like fennel can do: https://p.hagelb.org/match.fnl.html

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13:36 <samth> that fennel code is equivalent to this racket code, i think: http://pasterack.org/pastes/97732

13:38 <m455> samth: ahhh thanks! i'll give that a good!! i really appreciate it. been struggling with this for days lol

13:38 <m455> didn't know about the == in matches!

13:38 <samth> I was just confused about what definitions you were looking for

13:39 <m455> haha yeah i had no clue how to word it/terminology sorry!

13:39 <m455> i figured pasting the solution someone had in another lang would help!

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13:49 <m455> samth: yesss the == is exactly what i was looking for!!

13:51 <m455> http://pasterack.org/pastes/75485 :D :D

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