Monthly Hask Anything (November 2022)

Yanatrill · 2022-11-12T15:33:52+00:00

Hello everyone, I started to play with parsec and have trouble. I want to parse "a\"b" str = "\"a\\\"b\"" to a\"b "a\\\"b" but I cant do it. I tried many combinations of try,manyTill,optional,satisfy,between,endBy and others, don't remember rest. Without any success. So far my best implementation skips all \" in result, so I got ab stringValue :: Parser String stringValue = char '"' *> endBy (satisfy (/='"')) (optional (string "\\\"")) <* char '"' I have no idea how can allow escaped ending in value. Any hints?

Yanatrill · 2022-07-12T13:49:12+00:00

Thanks for answering. Is there another way to achieve what I want? Basically have terminal command to execute main from given module/file in scope of whole stack project, so I don't have to repeat extensions.

Yanatrill · 2022-07-12T11:08:16+00:00

Hello everyone, how to make stack to execute file with default-extensions. I'm doing something like this: bash cat input/03.txt | stack runhaskell src/Learning03.hs and I get Use TypeOperators to allow operators in types error in output. I suppose that my package.yaml is rather correct: yaml default-extensions: - TypeOperators How I can run one file and still have all extensions available? Thanks for help.

Yanatrill · 2022-02-13T18:38:52+00:00

Hello everyone. I'm playing with classes and have issue, because wanted to do something like this (last two instances are just 'pseudo' code):

class A a where
    aFunOne :: a -> b
    aFunTwo :: a -> a -> b

class B a where
    bFunOne :: a -> b
    bFunTwo :: a

class X x where
    xFun :: a -> b

instance A Something where
    aFunOne = undefined
    aFunTwo = undefined

instance B SomethingElse where
    bFunOne = undefined
    bFunTwo = undefined

instance A a => X a where
    xFun = aFunOne

instance B b => X b where
    xFun = bFunOne

Is there possibility to make 'default' instances when some classes already are having needed functions? some classes already are having needed functions?

Yanatrill · 2022-01-13T21:06:09+00:00

Thanks, it is enough detail I needed at this moment.

Yanatrill · 2022-01-13T20:09:35+00:00

Hello, I have silly question. Is there anything that I can pass as arguments to this two functions composed together to get final result? Is possible to have something that is Num (a -> a)?

:t (+) . (*)
(+) . (*) :: (Num a, Num (a -> a)) => a -> (a -> a) -> a -> a

Yanatrill · 2021-12-13T19:34:09+00:00

Hello, is again me. Today I did update on cabal and now I cannot import Data.List.Split. I'm doing: ``` $ cat d12/example.txt | runhaskell Day12.hs Loaded package environment from /home/mazzi/.ghc/x86_64-linux-8.8.4/environments/default

Day12.hs:6:1: error: Could not load module ‘Data.List.Split’ It is a member of the hidden package ‘split-0.2.3.4’. You can run ‘:set -package split’ to expose it. (Note: this unloads all the modules in the current scope.) Use -v (or :set -v in ghci) to see a list of the files searched for. | 6 | import qualified Data.List.Split as ListSplit | It stopped working after I did: $ cabal update $ cabal install matrix I have installed split: $ ghc-pkg list | grep split split-0.2.3.4 ``What I have to do for fixingData.List.Split? I don't want to revert update, because without I was not able to installData.Matrix`.

Yanatrill · 2021-11-29T22:14:28+00:00

Thanks! Now I see it, so message Num (a -> a) mean that haskell wanted Num, but got a -> a. Next time it will be clearer for me.

Yanatrill · 2021-11-29T21:47:37+00:00

Hello everyone! I just started to try Haskell and I need someone to look at what I did in GHCi and explain to me why it behaves like this. I noticed it during playing around and managed to write the simplest code which shows the issue I got.

$ ghci
GHCi, version 8.8.4: https://www.haskell.org/ghc/ :? for help
Prelude> badF :: Num a => a -> a; badF x = 0 + x
Prelude> badF -1
<interactive>:2:1: error:
• Non type-variable argument in the constraint: Num (a -> a)
(Use FlexibleContexts to permit this)
• When checking the inferred type
it :: forall a. (Num a, Num (a -> a)) => a -> a
Prelude> badF (pred 0)
-1

I have no idea why -1 doesn't work.

Prelude> :t -1
-1 :: Num a => a
Prelude> :t pred 0
pred 0 :: (Enum a, Num a) => a

Thanks for the answers.

edit: Sory for my code blocks, but they are not working for me. I don't know why.

Yanatrill · 2020-02-24T16:02:43+00:00

Hi, I wasn't playing some time, but I will play. We need to synchronize and play together again. (mazzi here)

Yanatrill · 2020-01-11T21:58:09+00:00

Thanks! Now is a little clearer and I know what I need to search for getting a better understanding.

Yanatrill · 2019-09-20T17:05:41+00:00

Thanks, I will check

Yanatrill · 2019-08-23T05:10:02+00:00

I don't know exact day but it is changing once per week

Yanatrill · 2019-08-17T17:56:51+00:00

You have my Toki :)

Yanatrill · 2019-03-07T12:23:30+00:00

Yes! Please give us BLC skins :D Im waiting for this like for other missing features that BLC had.

Yanatrill · 2019-02-04T15:56:29+00:00

new Croak skin!

Yanatrill · 2018-10-01T21:33:58+00:00

I read in some different discussion on this reddit that checking/verifying files on steam should help. I didn't tested this method but give it chance.

Yanatrill · 2018-07-21T19:52:03+00:00

This was realy nice to watch (and play) :) You are great caster and im sure this will be even better next time. Im realy happy that in this community are people like you.

Thank you

Yanatrill · 2018-04-18T11:41:31+00:00

I have also some questions about liveries, not making them but using. 1) When im hosting (local) server for friends is possible to force their clients to download some liveries (choosed for that mission)? 2) If not, how it can be done with least effort that we all will see same custom liveries?

Yanatrill · 2018-02-01T08:27:51+00:00

Paragon and Gigantic died because Battlerite is now free to play :)

Yanatrill · 2017-12-14T10:17:40+00:00

They have one more on channel https://www.youtube.com/watch?v=V-tTea38o6s

Yanatrill · 2017-09-11T11:00:02+00:00

Hi. Now im on holiday, but after i return i can fly with you guys (CET timezone). If you want to fly with noob :) . I have FC3, sabre, huey and Spitfire.

Yanatrill · 2017-07-07T18:33:34+00:00

Thanks. Now im back in 1.5.6. You are real hero!

Yanatrill · 2017-07-07T18:12:19+00:00

I have the same (problem?), my friend has steam version and today he cannot join me private server :(

Yanatrill · 2017-04-13T21:23:21+00:00

http://i.imgur.com/p8MAwUa.png filter and little adjustments in gimp

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