Logs: liberachat/#haskell
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| 2021-07-22 01:25:51 | <Boarders> | this question might be sort of nonsense but is there any version of having Reader where if you throw an error you also get access to the local environment at that point? |
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| 2021-07-22 01:26:07 | <Boarders> | I don't really want state because I don't want to do stateful things other than that |
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| 2021-07-22 01:28:48 | <dsal> | State has a lot of downsides. |
| 2021-07-22 01:29:13 | <dsal> | I'm not sure what you mean by throwing an error, though. You can do `ReaderT ExceptT` I assume. |
| 2021-07-22 01:30:17 | <arkanoid> | is there a builtin function that filters a list in order until a condition is met on an element? I've built mine, but I'm interested in knowing |
| 2021-07-22 01:31:01 | <dibblego> | @type find |
| 2021-07-22 01:31:02 | <lambdabot> | Foldable t => (a -> Bool) -> t a -> Maybe a |
| 2021-07-22 01:31:17 | → | dajoer joins (~david@user/gvx) |
| 2021-07-22 01:31:22 | <dibblego> | > find even [1,3,5,7,8,3,5] |
| 2021-07-22 01:31:24 | <lambdabot> | Just 8 |
| 2021-07-22 01:31:28 | <dibblego> | > find even [1,3,5,7] |
| 2021-07-22 01:31:30 | <lambdabot> | Nothing |
| 2021-07-22 01:34:13 | <arkanoid> | and to return [1,3,5,7] instead of Just 8? (elements up to found one) |
| 2021-07-22 01:34:26 | × | Deide quits (~Deide@user/deide) (Quit: Seeee yaaaa) |
| 2021-07-22 01:35:00 | <geekosaur> | > takeWhile odd [1,3,5,7,8,3,5] |
| 2021-07-22 01:35:02 | <lambdabot> | [1,3,5,7] |
| 2021-07-22 01:37:38 | <dsal> | > takeWhile (not . even) [1,3,5,7,8,3,5] -- if you want to think about it that way |
| 2021-07-22 01:37:40 | <lambdabot> | [1,3,5,7] |
| 2021-07-22 01:41:05 | <arkanoid> | yeah! very nice |
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| 2021-07-22 01:43:48 | <arkanoid> | and to return 8,5,3? Like "discard until condition" |
| 2021-07-22 01:45:32 | <arkanoid> | or "filter with stop condition" |
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| 2021-07-22 01:50:44 | <monochrom> | dropWhile |
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| 2021-07-22 01:57:51 | <sm> | see also break, span, partition |
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| 2021-07-22 02:00:44 | <arkanoid> | thanks (also for your patience) |
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| 2021-07-22 02:23:06 | <dsal> | Or just read Data.List docs. :) And maybe Foldable. |
| 2021-07-22 02:25:23 | <sm> | and the split library. (List part deux) |
| 2021-07-22 02:25:41 | <sm> | it's never "just" with Haskell :) |
| 2021-07-22 02:26:31 | <dsal> | Ha. Yeah. "Oh, you think you've read all the docs? ..." |
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| 2021-07-22 02:29:39 | <arkanoid> | well, I've finally succeeded in passing the test for my first haskell program. Also first use of Maybe monad! No bind yet and surely I've been missing all possible chances to write better code, but this made my day https://exercism.io/tracks/haskell/exercises/acronym/solutions/fd01b2dda63344518e86b263aaeac983 |
| 2021-07-22 02:29:51 | <jeetelongname> | hoogle is a wonderful reasourse if you have not checked it out |
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| 2021-07-22 02:30:10 | <arkanoid> | yeah I've been using it quite a lot on the last couple hours |
| 2021-07-22 02:30:30 | <sm> | congrats! |
| 2021-07-22 02:31:22 | <arkanoid> | any suggestion is welcome! |
| 2021-07-22 02:31:38 | <sm> | maybe too late now, but I enjoyed project euler in the beginning - it was more about numbers, which were easier |
| 2021-07-22 02:32:25 | <jeetelongname> | another reasourse I have been using is https://www.cis.upenn.edu/~cis194/spring13/lectures.html its a uni course that takes you through the basics to monads. all with reasources and assignments |
| 2021-07-22 02:32:49 | <arkanoid> | sm: I've consumed project euler back in the days of my advanced programming classes. We used python metaprogramming and aspectj (java) |
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| 2021-07-22 02:33:40 | <glguy> | If you're looking for exercises to learn on I thought the previous advent of code was pretty good https://adventofcode.com/2019 and it has a nice feature that year where half the problems built on the same "virtual machine" so you got a chance to reuse some code across problems |
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| 2021-07-22 02:34:15 | <sm> | that is waay harder for a haskell beginner... |
| 2021-07-22 02:35:07 | <glguy> | euler won't give you very much haskell learning opportunity and the advent of code problems aren't generally that hard |
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| 2021-07-22 02:35:19 | <sm> | ha says you :) |
| 2021-07-22 02:35:32 | <jeetelongname> | hackerrank would probably be a better fit. tho the templates are way to overcomplicated and its just easier to replace them |
| 2021-07-22 02:35:39 | <glguy> | half the problems that year are stand-alone and the other half has some common code to share which I think it way better for learning than starting over every time |
| 2021-07-22 02:35:59 | <arkanoid> | I like the exercism way to teach |
| 2021-07-22 02:36:13 | <arkanoid> | it gives some context with test code and tools |
| 2021-07-22 02:37:02 | <sm> | each at the proper tiem |
| 2021-07-22 02:37:06 | <sm> | time |
| 2021-07-22 02:37:17 | <jeetelongname> | I have a bone to pick with AOC. I swear it made my blood pressure rise a good couple of units just to try and solve the problem in one day |
| 2021-07-22 02:37:34 | <arkanoid> | when I think adventofcode I feel like want use my main language |
| 2021-07-22 02:37:44 | <sm> | clash of code teaches only certain small skills, but is fun |
| 2021-07-22 02:38:59 | <jeetelongname> | AOC was meant to be my way of picking up a new language (ruby in this case (this was before I was enlightened go easy on me)) but I just got bogged down in the problems and didn't learn all to much |
| 2021-07-22 02:39:00 | <sm> | exercism, project euler, advent of code, hackerrank, clash of code.. any notable others ? |
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| 2021-07-22 02:39:41 | <arkanoid> | I just want to learn how to write more pure code in other imperative languages, and >>= there too |
| 2021-07-22 02:40:12 | <keltono> | arkanoid: nice solution! one thing I would note is that you didn't need to define consumeWhile |
| 2021-07-22 02:40:18 | <keltono> | @hoogle dropWhile |
| 2021-07-22 02:40:18 | <lambdabot> | Prelude dropWhile :: (a -> Bool) -> [a] -> [a] |
| 2021-07-22 02:40:18 | <lambdabot> | Data.List dropWhile :: (a -> Bool) -> [a] -> [a] |
| 2021-07-22 02:40:18 | <lambdabot> | Data.List.NonEmpty dropWhile :: (a -> Bool) -> NonEmpty a -> [a] |
| 2021-07-22 02:40:28 | → | lavaman joins (~lavaman@98.38.249.169) |
| 2021-07-22 02:40:30 | <sm> | didn't johann tibbell or someone make a learn-haskell-by-making-a-game thing ? |
| 2021-07-22 02:41:54 | ← | jeetelongname parts (~jeet@host-89-241-98-229.as13285.net) (oh wow I need to sleep. Night!) |
| 2021-07-22 02:43:20 | <sm> | can't find it |
| 2021-07-22 02:43:21 | <arkanoid> | keltono: thanks! Actually I forgot to replace at the end (I reinvented the wheel before finding out dropWhile) |
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