Logs on 2022-09-02 (liberachat/#haskell)
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| 00:41:47 | <segfaultfizzbuzz> | so if i am trying to sample from a distribution (think: monte carlo), let's suppose that i have a batch of observations, such as one hundred observations with some kind of answer regarding whether these observations do or don't have the desired characteristic |
| 00:42:18 | <segfaultfizzbuzz> | for instance i have my circle and i select uniformly at random (x, y) coordinates from a unit interval and then i get information on whether each point is inside the circle or not |
| 00:42:39 | <segfaultfizzbuzz> | somehow i need to update my sampling method based on these observations |
| 00:42:58 | <segfaultfizzbuzz> | but i can't think that there is any "rational" manner for doing this |
| 00:43:26 | <segfaultfizzbuzz> | it seems like you always have to have some kind of model which learns how to update the sampling process from the examples |
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| 03:35:41 | <albet70> | how to implement chunksOf with lambda? |
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| 03:53:28 | <dsal> | albet70: That question's a little odd. What are you trying to do? |
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| 04:11:05 | <komikat[m]> | hi |
| 04:11:11 | <komikat[m]> | is Haskell programming from ff still a good book to learn haskell/fp from |
| 04:11:11 | <komikat[m]> | have read like 5 chapters but find it boring and can't motivate myself enough to go through it |
| 04:11:47 | <glguy> | still? |
| 04:12:23 | <dsal> | komikat[m]: I read it concurrently with project work. I thought it was good. Some people don't like it. |
| 04:12:54 | <maerwald[m]> | komikat: burn the books and staht coding |
| 04:13:29 | <komikat[m]> | glguy: still as in I already have been programming for years but its always been something general purpose like python/lisp or low level stuff like C/C++ |
| 04:13:47 | <komikat[m]> | maerwald[m]: what do i code :P |
| 04:13:57 | <komikat[m]> | dsal: any other recommendation? |
| 04:14:43 | <dsal> | There are lots of books, but I don't learn well without a project that's interesting to me. |
| 04:15:41 | <komikat[m]> | how do i look for projects that may interest me |
| 04:15:56 | <glguy> | komikat[m]: the problem with hpffp is that it typically uses way more words than needed and is often wrong or subtly wrong. You'd want to write a program that was interesting to you. Presumably there's a reason you want to program |
| 04:16:33 | <maerwald[m]> | komikat[m]: A terminal game |
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| 04:16:48 | <komikat[m]> | komikat[m]: because my uni focusses a lot more on algorithmic problems instead of straight up projects |
| 04:16:57 | <jackdk> | http://jackkelly.name/blog/archives/2022/05/28/text-mode_games_as_first_haskell_projects/ |
| 04:17:09 | <maerwald[m]> | komikat: implement graham scan in haskell |
| 04:17:17 | <maerwald[m]> | Visualize it with diagrams or so |
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| 04:18:05 | <maerwald[m]> | 2d algorithms are fine |
| 04:19:12 | <maerwald[m]> | Image processing is also fun |
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| 04:20:21 | <slack1256> | How do I force stack to clone private repo via ssh instead of https? |
| 04:20:28 | <slack1256> | repos*. |
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| 04:21:54 | <slack1256> | Wait, nevermind. |
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| 04:23:40 | <maerwald[m]> | slack1256: protocol is part of the url |
| 04:26:19 | <slack1256> | Yeah, `git checkout` had overwritten that file to their https counterpart. |
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| 04:45:49 | <c209e6dc-4d76-47> | I am trying to construct a function `m [(a, [(b, c)])] -> m [(a, [(b', c)])]` where I have a function `b -> m b'` |
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| 04:54:50 | <pavonia> | m is a Monad? |
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| 04:56:19 | <dsal> | If m is a functor, you should remove that from the requirement. |
| 04:57:16 | <dsal> | And [] is a functor, and (,) is a functor. |
| 04:57:38 | <dsal> | Your function is approximately fmap.fmap.fmap with maybe a first in there somewhere. |
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| 04:58:34 | <dsal> | I guess if you really need `b -> m b'` then you replace one of the `fmap`s with a `traverse` |
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| 04:58:53 | <aaron[m]1234> | they would all need to be traverse |
| 04:59:01 | <aaron[m]1234> | assuming that's the desired behavior |
| 05:02:17 | <c209e6dc-4d76-47> | I think traverse is what I needed |
| 05:02:19 | <c209e6dc-4d76-47> | thanks! |
| 05:03:20 | <dsal> | :t traverse.traverse.traverse |
| 05:03:22 | <lambdabot> | (Applicative f, Traversable t1, Traversable t2, Traversable t3) => (a -> f b) -> t1 (t2 (t3 a)) -> f (t1 (t2 (t3 b))) |
| 05:03:34 | <aaron[m]1234> | with lens you can do this easily with Traversals |
| 05:03:37 | <Axman6> | also pretty easy to do with lens |
| 05:03:42 | <Axman6> | damn, beaten to it |
| 05:03:53 | <Axman6> | "It's always traverse" |
| 05:03:56 | <aaron[m]1234> | e.g. x >>= (each . _2 . each ._1) f |
| 05:05:27 | <dsal> | :t \x f -> x >>= (each . _2 . each ._1) f |
| 05:05:29 | <lambdabot> | (Monad m, Field2 a1 b1 a2 b2, Each s b3 a1 b1, Each a2 b2 a3 b4, Field1 a3 b4 a4 b5) => m s -> (a4 -> m b5) -> m b3 |
| 05:05:35 | <dsal> | so pretty |
| 05:05:39 | <aaron[m]1234> | lol |
| 05:06:18 | <Axman6> | "obviously" |
| 05:07:03 | <Axman6> | the implementation is something anyone with a reasonable lens experience would be able to read easily, but probably not tell you what the exact typw it. |
| 05:07:09 | <aaron[m]1234> | :t \x f -> x >>= (traverse . _2 . traverse . _1) f |
| 05:07:11 | <lambdabot> | (Monad m, Field2 a1 b1 (t1 a2) (t1 b2), Traversable t2, Traversable t1, Field1 a2 b2 a3 b3) => m (t2 a1) -> (a3 -> m b3) -> m (t2 b1) |
| 05:07:19 | <Axman6> | type* I'd personally use traverse |
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| 05:11:55 | <dsal> | each is mostly cool to abuse tuples as lists. |
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| 05:18:22 | <c209e6dc-4d76-47> | I came up with this https://paste.tomsmeding.com/t4MXCadz |
| 05:18:45 | <c209e6dc-4d76-47> | seems like there could be a simpler way, but I'm not allowed to use lenses |
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| 05:20:52 | <dsal> | Not being able to use lenses can really complicate things sometimes. |
| 05:23:00 | <aaron[m]1234> | Not a fan of using zip like that. How about using Bitraversable |
| 05:23:24 | <c209e6dc-4d76-47> | it's part of base? |
| 05:24:31 | <Axman6> | @hoogle Bitraversable |
| 05:24:31 | <lambdabot> | module Data.Bitraversable |
| 05:24:31 | <lambdabot> | Data.Bitraversable class (Bifunctor t, Bifoldable t) => Bitraversable t |
| 05:24:31 | <lambdabot> | module Data.Semigroup.Bitraversable |
| 05:24:45 | <Axman6> | hmm, forgot that doesn't tell you the package |
| 05:25:00 | <aaron[m]1234> | think it is |
| 05:25:01 | <c209e6dc-4d76-47> | seems like it's in base on hoogle |
| 05:29:29 | <aaron[m]1234> | :t \f x -> x >>= (traverse $ traverse $ traverse $ bitraverse f pure) |
| 05:29:31 | <lambdabot> | error: |
| 05:29:31 | <lambdabot> | • Variable not in scope: |
| 05:29:31 | <lambdabot> | bitraverse :: t -> (a0 -> f0 a0) -> a -> m b |
| 05:32:06 | <c209e6dc-4d76-47> | :t \f x -> x >>= (traverse $ traverse $ traverse $ traverse (bitraverse f pure)) |
| 05:32:07 | <lambdabot> | error: |
| 05:32:07 | <lambdabot> | • Variable not in scope: |
| 05:32:07 | <lambdabot> | bitraverse :: t -> (a0 -> f0 a0) -> a -> m b |
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| 05:35:28 | <aaron[m]1234> | :t \f x -> x >>= (traverse $ traverse $ traverse $ Data.Bitraversable.bitraverse f pure) |
| 05:35:29 | <lambdabot> | (Monad m, Traversable t1, Traversable t2, Traversable t3, Data.Bitraversable.Bitraversable t4) => (a -> m c) -> m (t1 (t2 (t3 (t4 a d)))) -> m (t1 (t2 (t3 (t4 c d)))) |
| 05:37:11 | <rustisafungus> | "not allowed to use lens" -- where does this kind of mandate come from? |
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| 05:43:30 | <dsal> | rustisafungus: Lots of places where developers are diverse and they want to limit the number of languages people need to learn. |
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| 05:47:00 | <maerwald[m]> | After you've had a Monoid based bug in production with lens maybe |
| 05:47:03 | <c209e6dc-4d76-47> | I'm working on some open source project and adding a new dependency of lens just for this will be too much |
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| 05:47:38 | <c209e6dc-4d76-47> | it's preferred to keep it to bare minimum and also the end goal is something else |
| 05:47:54 | <c209e6dc-4d76-47> | if I was the owner, I might have added it without a thought |
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| 06:02:48 | <caffery156> | guys what is `Nothing` in haskell.Is it equivalent of null or what? |
| 06:04:24 | <[_________]> | Nothing is a constructor of Maybe a. |
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| 06:14:53 | <dsal> | `Maybe` is a sum type that adds one to the cardinality of another type by introducing `Nothing` e.g., if you have a `Bool`, it's got two values (`True` and `False`) whereas `Maybe Bool` has three values (`Nothing`, `Just True`, and `Just False`) |
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| 06:22:40 | <DigitalKiwi> | ah this must be the infamous null + 1 error i heard about |
| 06:22:46 | <DigitalKiwi> | https://twitter.com/grhmc/status/1564975641761660928 |
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| 06:30:44 | <Guest5079> | How do I get CoC to recognize libraries in a Haskell project? |
| 06:31:38 | <Guest5079> | For example, in the stack default project, when loading `Main`, it doesn't recognize the module Lib even though it's in src |
| 06:34:08 | <c_wraith> | What's CoC? the only thing coming to mind is "calculus of constructions", and contextually I'm pretty sure that's wrong |
| 06:35:01 | <DigitalKiwi> | code of conduct |
| 06:35:15 | <c_wraith> | That also doesn't quite fit contextually. |
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| 06:36:53 | <maerwald[m]> | c_wraith: coc.nvim |
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| 06:37:10 | <c_wraith> | ah! now that makes sense. and also utterly disqualifies me from helping. :) |
| 06:37:37 | <Guest5079> | my apologies, it's coc not CoC. It's a vim plugin for using language servers such as hls https://github.com/neoclide/coc.nvim |
| 06:38:30 | <maerwald[m]> | c_wraith: it's the worst of all LSP clients. Entirely written in nodejs |
| 06:39:05 | <maerwald[m]> | Occasionally works and if it does, makes your screen flicker due to feature creep |
| 06:39:15 | <c_wraith> | also, I'm an emacs heathen, so completely untrustworthy. :P |
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| 06:54:10 | <maerwald[m]> | Worshipping the old gods, I see |
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| 07:32:01 | <jackdk> | c_wraith: good to see someone else keeping the old ways alive |
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| 08:03:10 | <kuribas> | how does ghc grow the stack? |
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| 08:03:20 | <kuribas> | does it just allocate a bigger stack, and copy the whole thing? |
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| 08:14:03 | <[exa]> | what stack? |
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| 08:20:06 | <Axman6> | GHc's stack is segmented IIRC |
| 08:21:56 | <Axman6> | See the RTS flags: |
| 08:21:58 | <Axman6> | -ki<size> Sets the initial thread stack size (default 1k) Egs: -ki4k -ki2m |
| 08:21:58 | <Axman6> | -kc<size> Sets the stack chunk size (default 32k) |
| 08:21:59 | <Axman6> | -kb<size> Sets the stack chunk buffer size (default 1k) |
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| 08:28:28 | <kuribas> | Axman6: but then how does it "jump" from one segment to the other? |
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| 08:35:35 | <Axman6> | pretty sure all stack modifications check the current chunk bounds |
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| 10:06:09 | <kuribas> | hmm: _s2hg::I64 = _s2h1::I64 * 3 + (_s2h1::I64 * 3 + ((_s2h3::I64 << 2) + (_s2h1::I64 * 3 + ((_s2h3::I64 << 2) + (I64[R1 + 7] << 5))))); |
| 10:06:26 | <kuribas> | it looks like it could have calculated the "_s2h1::I64 * 3" part only once. |
| 10:06:53 | <kuribas> | I would think the CSE would take care of that. |
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| 10:24:36 | <kuribas> | ah, llvm does it better. |
| 10:25:44 | <kuribas> | it generated "imulq $9, 16(%rbp), %rsi" |
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| 10:30:07 | <kuribas> | but it's an old ghc (8.6.5) so they may have been improved |
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| 10:40:56 | <kuribas> | So far I am quite satisfied with how ghc can inline known variables, functions and class instances. |
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| 10:43:41 | <kuribas> | I was worried lazyness would get in the way of that, but it doesn't. |
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| 13:10:53 | <Guest56> | Hi guys, I am beginning the mooc.fi haskell course and I am having an issue with downloading the stack tool. I am getting a lot of warnings about its safety, i am inclined to ignore them and download regardless but is there anything i should know about its safety. Thanks in advance. |
| 13:12:26 | <geekosaur> | stack itself is fine. I do wonder if "warnings about its safety" means either you've found an untrusted repo, or if your Let's Encrypt root cert is expired |
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| 13:25:43 | <Guest56> | I am not on a linux machine, its actually windows that doesn't seem to like the download, the Stack site provides a link to download through windows installer.I think I will just ignore the warnings and install, its probably because of the low number of installs onto windows. |
| 13:27:53 | <Guest56> | Its fine, it passed all the antivirus hoops. |
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| 13:58:14 | <texasmynsted> | I watched this https://youtu.be/3uwrtjxiq6E about Rel8. Great idea and interesting. It occurs to me that I would like to find an alternative approach to working with postgres. |
| 13:59:56 | <texasmynsted> | There are _many_ database packages. What is something I should look at if I want many of my queries to be raw SQL but still have a nice experience in haskell? |
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| 14:03:27 | <merijn> | texasmynsted: "rolling your own" :p |
| 14:03:49 | <texasmynsted> | :-) That would likely be fun. |
| 14:03:56 | <merijn> | texasmynsted: My advice would be: use one of the X-simple low level packages and handroll your own abstractions on top of that |
| 14:04:11 | <merijn> | That's what I would do for my code with the benefit of hindsight |
| 14:04:33 | <merijn> | I'm using persistent atm, but I would definitely *not* advise that :p |
| 14:04:33 | <texasmynsted> | https://xkcd.com/927/ |
| 14:05:25 | <merijn> | texasmynsted: I build my own kinda abstraction on top of it if you want some inspiration: https://github.com/merijn/Belewitte/blob/master/benchmark-analysis/src/Query.hs |
| 14:05:29 | <texasmynsted> | heh, why not _persistent_? |
| 14:06:04 | <merijn> | texasmynsted: Because using it correctly involves becoming an expert in persistent internals |
| 14:06:49 | <merijn> | The superficial API seems very convenient and easy. And then you realise the design of a bunch of dependencies and other things changed introducing all sorts of tricky edge cases into this "safe" API |
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| 14:07:37 | <texasmynsted> | "Because using it correctly involves becoming an expert in persistent internals" = exactly what I am trying to avoid. |
| 14:07:51 | <merijn> | texasmynsted: See for example https://github.com/yesodweb/persistent/issues/981 |
| 14:08:22 | <texasmynsted> | o_O yike! |
| 14:08:30 | <texasmynsted> | or yikes |
| 14:08:51 | <texasmynsted> | hehe, persistent is out then |
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| 14:09:17 | <merijn> | texasmynsted: Personally I would just use sqlite-simple if I had to do this again (or postgres-simple if you want to use postgres) |
| 14:10:24 | <merijn> | And then wrap it with something like the Query type I made to encapsulate the messy low level bits and provide a nice high-level API |
| 14:14:19 | <texasmynsted> | Okay that does sound like a good fit |
| 14:17:36 | <merijn> | texasmynsted: The low-level/raw SQL intercace I use in the module I linked is basically equivalent to the interface the -simple packages provide, so should be easy enough to roll something like that |
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| 14:38:20 | <texasmynsted> | Thank you :-) |
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| 14:48:12 | <ryantrinkle> | merijn: wow that is a mess lol |
| 14:48:30 | <ryantrinkle> | texasmynsted: i agree with merijn that the *-simple libs are great |
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| 14:48:54 | <ryantrinkle> | if you want more of your DB schema to be typed in Haskell-land, i'd recommend Beam |
| 14:49:06 | <ryantrinkle> | but it requires a decent investment of time to learn |
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| 15:02:12 | <kuribas> | meh, I've been using my own database library with not many problems. |
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| 15:02:37 | <kuribas> | without the complexity of beam, and without the unsafeness of *-simple |
| 15:02:56 | <kuribas> | though it currently works only on mysql |
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| 15:18:19 | <pareto-optimal-d> | <ryantrinkle> "if you want more of your DB..." <- I've started recommending rel8 over either persistent or beam if you are using or can use postgres |
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| 15:21:40 | <c_wraith> | have you found its model to work for your needs? I've always thought the idea of rel8 was cool, but I wasn't sure it was flexible enough for what I need. |
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| 15:48:36 | <pareto-optimal-d> | I've only been using it for side projects so far since work has lots of blockers for such a move c_wraith |
| 15:48:36 | <pareto-optimal-d> | However I can't think of cases where it wouldn't be flexible enough for work use cases for me. |
| 15:48:36 | <pareto-optimal-d> | It's an adjustment for sure since your mental model becomes more Haskell than SQL. |
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| 15:50:01 | <pareto-optimal-d> | Question: Is there some trick to showing all "instance Arbitrary YourType` not defined errors? Like if that type had a field whose type didn't have an arbitrary instance, I'd like to see both errors. |
| 15:50:01 | <pareto-optimal-d> | I thought `-fkeep-going` and `-fdeferred` type errors might do it but they didn't. |
| 15:50:17 | <pareto-optimal-d> | This also may not be easily possible. |
| 15:51:00 | <c_wraith> | The thing is, that's not actually knowable |
| 15:51:23 | <c_wraith> | it's possible you'll write an instance that doesn't require an instance for its type variables |
| 15:51:56 | <c_wraith> | That sounds very unlikely with Arbitrary, but it is theoretically possible |
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| 16:42:22 | <texasmynsted> | okay. That makes sense. There are times where a query is complex or potentially time consuming where I want to just use SQL and let the query planner handle the complexity. |
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| 16:44:10 | <texasmynsted> | rel8 is impressive . . . |
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| 17:02:12 | <pareto-optimal-d> | <texasmynsted> "rel8 is impressive . . ." <- Yeah the cookbook gives you a good feel for it too: |
| 17:02:12 | <pareto-optimal-d> | https://rel8.readthedocs.io/en/latest/cookbook.html |
| 17:04:34 | <pareto-optimal-d> | I'm waiting on schema-rel8 to try stuff on work models: https://github.com/circuithub/rel8/pull/59 |
| 17:04:48 | <pareto-optimal-d> | * on schema-to-rel8 to |
| 17:04:56 | <pareto-optimal-d> | * on schema-to-rel8 to, * on work db models: https://github.com/circuithub/rel8/pull/59 |
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| 17:32:45 | <texasmynsted> | nice |
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| 18:31:50 | <Guest2> | I’m looking at the servant tutorial and I’m having trouble interpreting: |
| 18:31:51 | <Guest2> | type RootEndpoint = |
| 18:31:51 | <Guest2> | Get '[JSON] User |
| 18:31:52 | <Guest2> | what is ‘ and is [JSON] the type of a list of JSON? |
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| 18:33:26 | <Guest2> | anyone around that can offer suggestions of what I need to read? I see DataKinds and TypeOperator extensions are enabled. Is the answer there? |
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| 18:33:44 | <geekosaur> | there, the tick means that what follows is a promoted value (in this case, a type level list) |
| 18:33:55 | <geekosaur> | DataKinds will tell you about the tick |
| 18:34:14 | <geekosaur> | the list is a list of types of kind JSON, which is probably promoted |
| 18:34:29 | <Guest2> | Ok, cool. Looks like a bunch of reading but prob. worth it |
| 18:34:30 | <geekosaur> | that is, somewhere there is a definition `data JSON = ...` |
| 18:34:47 | <geekosaur> | and the valid values of kind JSON are whatever the `...` is |
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| 18:35:34 | <Guest2> | Many thanks geekosaur |
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| 19:34:28 | <kydliceh> | hi |
| 19:35:20 | <geekosaur[m]> | Hi |
| 19:37:18 | <kydliceh> | I am having trouble with writing bind function for my state Monad :/ |
| 19:37:40 | <kydliceh> | https://github.com/hynky1999/LidlParser/blob/main/app/Interpreter.hs you can see the function at line 45 |
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| 19:41:56 | <geekosaur> | I would guess you've done something wrong somewhere else if you have an `IO a` (a generator of `a`s, in effect) there instead of an `a` |
| 19:43:35 | <geekosaur> | presumably you want StateT Store IO (Either RuntimeError a) |
| 19:44:12 | <geekosaur> | at least, if I'm reading this right |
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| 19:45:23 | <kydliceh> | Well I haven't had there IO monad before. At the start it was just StateT Store (Either RuntimeError a). |
| 19:45:59 | <kydliceh> | But then I needed to add printing capability to interpreter, so that print statements can be called |
| 19:46:13 | <geekosaur> | then you need to do it the way I said |
| 19:46:32 | <kydliceh> | Okay I will try that |
| 19:46:35 | <geekosaur> | otherwise you're passing around `IO a`s you can't do anything with |
| 19:51:58 | <monochrom> | I would think that "StateT Store (ExceptT RuntimeError IO) a" is the most appropriate. |
| 19:52:33 | <monochrom> | or maybe not, maybe ExceptT RuntimeError (StateT Store IO) a |
| 19:52:40 | <geekosaur> | I conbsidered suggesting that, but wasn't sure even mentioning StateT was appropriate |
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| 20:26:09 | <geekosaur> | ? |
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| 20:39:59 | <geekosaur> | hrm |
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| 21:03:29 | <geekosaur> | kydliceh, you should probably be asking in here rather than pm-ing me; I'm not always at my desk |
| 21:03:58 | <geekosaur> | but I think you have some misunderstandings as to how monads work |
| 21:04:42 | <geekosaur> | (context for others: https://paste.tomsmeding.com/Ht52LOEs) |
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| 21:13:06 | <kydliceh_> | I do believe I understand how to work with one Monad but I don't quite understand how to work with composition of them |
| 21:16:38 | <geekosaur> | % :set -XTypedHoles |
| 21:16:38 | <yahb2> | Some flags have not been recognized: -XTypedHoles |
| 21:17:06 | <geekosaur> | % :set -XScopedTypeVariables |
| 21:17:06 | <yahb2> | <interactive>:1:1: error: Not in scope: ‘Yahb2Defs.limitedPrint’ |
| 21:17:30 | <geekosaur> | guess I'[m not using yahb2 |
| 21:17:48 | <geekosaur> | @let {-# LANGUAGE ScopedTypeVariables #-} |
| 21:17:49 | <lambdabot> | Defined. |
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| 21:26:36 | <geekosaur> | :t runStateT (do { (p :: _) <- StateT (\_ -> return (Right "a", 1)); return p }) 0 |
| 21:26:37 | <lambdabot> | (Monad m, Num s) => m (Either a [Char], s) |
| 21:26:56 | <geekosaur> | hm, didn't do the typed hole |
| 21:28:03 | <geekosaur> | https://paste.tomsmeding.com/GvlufZKP |
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| 21:30:10 | <geekosaur> | so `p` there is already Either RuntimeError String (I left the Left type unspecified and used String just to get somethingt that could be evaluated) |
| 21:30:49 | <geekosaur> | your use of `return` is somewhat suspect both in terms of trying to peel apart a monad stack, and looking as if you were trying to use it as a keyword |
| 21:31:14 | <[Leary]> | kydliceh_: You build the composition from Monad transformers so it already has a Monad instance. |
| 21:32:19 | <geekosaur> | also that |
| 21:33:05 | <geekosaur> | tomsmeding: [02 21:17:06] <yahb2> <interactive>:1:1: error: Not in scope: ‘Yahb2Defs.limitedPrint’ (from: % :set -XScopedTypeVariables) |
| 21:33:58 | <geekosaur> | maybe I should have used @tell, it's 22:30 over there I think… |
| 21:35:54 | <kydliceh_> | Yeah I thought I still use the Monad I have defined rather than use Monad transformers |
| 21:36:05 | <kydliceh_> | *I could still use |
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| 21:36:16 | <geekosaur> | you already have one, you can't replace it |
| 21:36:47 | <geekosaur> | and it should already do what you intend |
| 21:37:27 | <geekosaur> | @unmtl StateT Store IO (Either RuntimeError a) |
| 21:37:27 | <lambdabot> | Store -> IO (Either RuntimeError a, Store) |
| 21:37:42 | <kydliceh_> | Yeah But I was not using StateT |
| 21:38:15 | <kydliceh_> | I thought it would be Ok to leave there my custom State |
| 21:38:39 | <kydliceh_> | https://github.com/hynky1999/LidlParser/blob/main/app/State.hs |
| 21:38:45 | <geekosaur> | why do you need a custom State? and how did you plan to deal with IO? |
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| 21:39:54 | <geekosaur> | and, well, that module just looks like you reinvented Control.Monad.State (well, from mtl1 where it wasn't a wrapper for StateT). and you still need some way to deal with IO |
| 21:40:02 | <geekosaur> | \which is why StateT exists |
| 21:40:09 | <kydliceh_> | Well I don't need one, I reused a code from class so I left it there |
| 21:40:22 | <kydliceh_> | Yeah it was made to explain how state monad works |
| 21:43:39 | <kydliceh_> | I thought that I would resolve how to deal with IO at bind definition |
| 21:43:59 | <kydliceh_> | But I guess I will take a look at transfomers before I ask another questions for sure |
| 21:44:02 | <geekosaur> | but bind has no way to reach IO because it hasn't been plumbed through |
| 21:44:20 | <geekosaur> | if it gets an IO a it can't do anything but return it |
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| 21:44:47 | <kydliceh_> | Yeah that's why I had no idea how to continue |
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| 21:45:09 | <kydliceh_> | And that's why there were the returns so I could "unwrap it" |
| 21:45:28 | <geekosaur> | and even if you use your own State monad it will still behave like any other monad; you already get the whole thing evaluated with the <-, you can't peel it apart and manually evaluate each "level" |
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| 21:46:20 | <kydliceh_> | Ok, that makes sense. I thought I could somehow do it |
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| 21:46:56 | <geekosaur> | and even if you could, once you commit to `return` you can't bail out of it if you get a RuntimeError instead of a result |
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| 21:50:11 | <kydliceh_> | okay |
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| 22:34:06 | <fhn> | I want to apply STArray s to newArray in ghci but this doesn't work: ghci> :t newArray @(forall s. STArray s) Can I do this somehow? |
| 22:34:20 | <fhn> | (Error is: no impredicative polymorphism) |
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| 22:38:00 | <geekosaur> | what's wrong with newSTArray? |
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| 22:43:34 | <fhn> | I didn't know it existed ;) I looked into Data.Array.ST and from there to Data.Array.MArray. I see now that newSTArray is in GHC.Arr |
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| 22:44:52 | <geekosaur> | @index newSTArray |
| 22:44:52 | <lambdabot> | bzzt |
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| 22:48:31 | <fhn> | bzzt? |
| 22:48:49 | <geekosaur> | I believe what you really want is https://hackage.haskell.org/package/array-0.5.4.0/docs/Data-Array-ST.html and runSTArray, not using newSTArray directly |
| 22:48:57 | <geekosaur> | the bot was telling me it's not in base |
| 22:50:06 | <geekosaur> | any module starting with "GHC" is an internals module and you probably shouldn't use it directly |
| 22:50:24 | <geekosaur> | only GHC.Exts is considered "safe" |
| 22:50:54 | <fhn> | Good to know. Thank you! |
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| 22:55:50 | <geekosaur> | sorry for misleading you, I used hoogle but didn't notice it was pointing me at an internals module 😕 |
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| 23:05:36 | <fhn> | No worries. Appreciate suggesting runSTArray. If other beginners are wondering how to use it this is a minimal example: |
| 23:05:38 | <fhn> | Data.Array.ST.runSTArray (do arr <- Data.Array.ST.newArray (0, 3) "empty"; return arr) |
| 23:05:56 | <fhn> | Should return: array (0,3) [(0,"empty"),(1,"empty"),(2,"empty"),(3,"empty")] |
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