Logs: liberachat/#haskell
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| 2021-06-03 04:59:35 | <guest63`> | import Control.Applicative hiding (many, <|>) why this is parse error? |
| 2021-06-03 04:59:42 | <guest63`> | what's the proper way? |
| 2021-06-03 04:59:57 | <Axman6> | stick <|> in parens |
| 2021-06-03 05:00:08 | <Axman6> | import Control.Applicative hiding (many, (<|>)) |
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| 2021-06-03 05:03:03 | <guest63`> | Axman6: why there're so many <|> in different modules, could Text.ParserCombinators.Parsec.<|> work on something that is for Control.Applicative.<|> |
| 2021-06-03 05:03:26 | <guest63`> | hiding and qualified too many |
| 2021-06-03 05:03:35 | <Axman6> | Are you sure they aren't already exactly the same thing? is one just a reexport? |
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| 2021-06-03 05:04:10 | <stardustfp> | Now that I'm in the right place...what's the recommended first step to learning haskell? Is there a recommended book/course? I typically learn the fastest via video courses or just straight up code examples with simple explanations. |
| 2021-06-03 05:04:14 | <Axman6> | I would be surprised if most of them aren't just Control.Applicative ((<|>)) reexported |
| 2021-06-03 05:04:28 | <c_wraith> | the one in parser-combinators is definitely just a re-export |
| 2021-06-03 05:04:35 | <Axman6> | Welcome stardustfp |
| 2021-06-03 05:04:43 | <c_wraith> | clearly labeled as such: https://hackage.haskell.org/package/parser-combinators-1.3.0/docs/Control-Applicative-Combinators.html#g:1 |
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| 2021-06-03 05:12:26 | <Axman6> | stardustfp: I'm not sure what the current recommendations are, I haven't seen any comprehensive video tutorials - learning Haskell, depending on your background, often learns unlearning habits from other languages which don't make sense here, so most books and tutorials will start from the very fundamentals, because even those will be foreign |
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| 2021-06-03 05:30:52 | <novasenco> | https://gitlab.haskell.org 502 Error fyi |
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| 2021-06-03 05:34:06 | <Axman6> | tput: Did you get an answer to your generalised fibonacci thing? I think all you need to do is: f k = let fk = (42 : 11*k+77 : zipWith (((+ (10*k)) .) . (-) . (*2)) (tail fk) fk) in fk |
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| 2021-06-03 05:38:26 | <tput> | Axman6: yes. that's exactly what I needed to avoid re-evaluating f k. c_wraith helped out |
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| 2021-06-03 05:39:55 | <tput> | in the end, the next step of my solution to the exercise I was working on (determining if a number is semiprime) is just not quite fast enough. |
| 2021-06-03 05:40:19 | <tput> | this is the exercise: https://open.kattis.com/problems/blobsofdoom |
| 2021-06-03 05:41:05 | <tput> | I think there's likely a cleverer solution that I'm not seeing |
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| 2021-06-03 06:24:33 | <dmwit> | ?where tutorials -- stardustfp |
| 2021-06-03 06:24:33 | <lambdabot> | http://haskell.org/haskellwiki/Tutorials |
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| 2021-06-03 06:27:00 | <dmwit> | guest63``: Yeah, parsec2 defined its own (<|>) before (<|>) was a thing and it's kept it for back-compatibility ever since. But it does the same thing as C.A.<|>, so you can safely hide it. |
| 2021-06-03 06:27:53 | <dmwit> | guest63``: Also consider switching to parsec3 -- in many cases, this is as easy as just switching from `Text.ParserCombinators.Parsec[.Foo]` to `Text.Parsec[.Foo]` in all your imports. |
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| 2021-06-03 06:28:33 | <dmwit> | ...oh, scratch that, parsec3 exports a custom <|> as well. How obnoxious. |
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