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Logs: freenode/#haskell

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2021-03-03 18:16:15 × geekosaur quits (82650c7a@130.101.12.122) (Quit: Connection closed)
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2021-03-03 18:17:30 <dminuoso> Plus you can reuse a lot of architecture and optimization ideas from existing compilers, go doesn't really have any novelties to it.
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2021-03-03 18:36:38 × conal quits (~conal@64.71.133.70) (Ping timeout: 265 seconds)
2021-03-03 18:38:18 <ezzieyguywuf> ok, so `cabal install cabal-install` then `cabal unpack diagrama-contrib` cd into the dir amd `cabal test` should reproduce the random-1.2 conflict
2021-03-03 18:38:38 <ezzieyguywuf> is this just a non-intended use for cabal?
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2021-03-03 18:40:17 <monochrom> "cabal test" is always an intended use.
2021-03-03 18:40:34 × zebrag quits (~inkbottle@aaubervilliers-654-1-83-46.w86-212.abo.wanadoo.fr) (Quit: Konversation terminated!)
2021-03-03 18:40:36 <monochrom> But I get cabal-install from ghcup. I don't bother building it.
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2021-03-03 18:41:02 → Mrbuck joins (~Mrbuck@gateway/tor-sasl/mrbuck)
2021-03-03 18:41:08 <sclv> its possible you have a ghc env file accidentally created by calling `cabal install`
2021-03-03 18:41:10 × larryba quits (~bc8134e3@217.29.117.252) (Quit: http://www.okay.uz/)
2021-03-03 18:41:31 <sclv> on intermediate versions of cabal-install it created them too frequently even when just installing executables and not libs
2021-03-03 18:41:52 <sclv> this is now fixed, but the env file could still be around
2021-03-03 18:42:55 <maerwald> `cabal install cabal-install` isn't guaranteed to work (may depend on your GHC etc)
2021-03-03 18:43:26 × jamm_ quits (~jamm@unaffiliated/jamm) (Ping timeout: 240 seconds)
2021-03-03 18:44:07 <monochrom> But the env file is actively ignored in package contexts and project contexts. Hell I think almost most cabal commands.
2021-03-03 18:44:25 <monochrom> s/almost most/almost all/
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2021-03-03 18:47:25 → romesrf joins (~romesrf@44.190.189.46.rev.vodafone.pt)
2021-03-03 18:48:05 × Mrbuck quits (~Mrbuck@gateway/tor-sasl/mrbuck) (Quit: WeeChat 1.9.1)
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2021-03-03 18:50:10 <romesrf> hey all, how would I run a foldl until the value is bigger than x
2021-03-03 18:50:38 <monochrom> And then you want it to stop?
2021-03-03 18:50:50 <monochrom> I'm afraid foldl doesn't do early stop.
2021-03-03 18:50:51 <romesrf> i.e. foldl (+) 1 (listOfPrimes [] 2) : how can i run this until the 'accumulator value' is > 2000000
2021-03-03 18:51:03 × geekosaur quits (82650c7a@130.101.12.122) (Ping timeout: 240 seconds)
2021-03-03 18:51:52 <romesrf> listOfPrimes is infinite, so i'm thinking i need an additional construction to stop it midwhile with fold, but i decided to ask since as a beginner i might not be seeing the easier ways
2021-03-03 18:52:05 <swarmcollective> romesrf: maybe use: take 2000000 (listOfPrimes [] 2)
2021-03-03 18:52:09 × kritzefitz quits (~kritzefit@212.86.56.80) (Ping timeout: 245 seconds)
2021-03-03 18:52:59 × knupfer quits (~Thunderbi@i5E86B4BE.versanet.de) (Ping timeout: 245 seconds)
2021-03-03 18:53:01 <romesrf> swarmcollective: i had this, but i quit it after 3minutes running :) -> (sum (takeWhile (\x -> x < 2000000) (listOfPrimes [] 2))) + 1
2021-03-03 18:53:15 <romesrf> oh wait
2021-03-03 18:54:09 <romesrf> using fold is probably not going to solve my problems :)
2021-03-03 18:54:20 <swarmcollective> Oh, you are summing the primes. Sorry, I misread.
2021-03-03 18:54:21 <romesrf> at a point i thought the overhead could be because of the long list
2021-03-03 18:54:30 <romesrf> swarmcollective: no worries
2021-03-03 18:54:59 × CodeAlways quits (uid272474@gateway/web/irccloud.com/x-ubvhdubmvytegxuj) (Quit: Connection closed for inactivity)
2021-03-03 18:55:09 <monochrom> Most people's codings of "list of primes" are dog slow.
2021-03-03 18:55:28 <romesrf> yeah, i think i might need to finally implement a sieve algorithm
2021-03-03 18:55:38 × massma quits (~user@dyn-160-39-62-152.dyn.columbia.edu) (Remote host closed the connection)
2021-03-03 18:57:09 <romesrf> this is the correct way to share code right: https://paste.tomsmeding.com/nwpaIRYb
2021-03-03 18:57:32 <swarmcollective> That is a correct way.
2021-03-03 18:59:04 <monochrom> This adds two quadratic slowdowns on top of division slowdown.
2021-03-03 18:59:27 <monochrom> "null xs" takes constant time. "length xs == 0" takes linear time.
2021-03-03 19:00:49 <romesrf> monochrom: i laughed out loud reading that ahahahahaaha
2021-03-03 19:01:09 <romesrf> beginner mistakes is not understanding the complexities in the things i'm using
2021-03-03 19:01:39 <romesrf> null xs, i'll do that optimization
2021-03-03 19:02:08 × __minoru__shirae quits (~shiraeesh@109.166.56.89) (Ping timeout: 245 seconds)
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2021-03-03 19:03:49 <Guest_88> hi I'm a massive noob to Haskell and I'm trying to get the average of 3 integers using from integral. This is what I have so far - `averageThree :: Int -> Int -> Int -> Float
2021-03-03 19:03:49 <Guest_88> averageThree a b c = (fromIntegral a + fromIntegral b + fromIntegral c) / 3.0`
2021-03-03 19:04:20 → Wuzzy joins (~Wuzzy@p5b0df7c2.dip0.t-ipconnect.de)
2021-03-03 19:04:26 <Guest_88> any idea on why this is wrong?
2021-03-03 19:04:57 <__minoru__shirae> romesrf: my suggestion is to write a short-circuiting function and then use it with foldr
2021-03-03 19:05:03 <__minoru__shirae> if it is possible in this case
2021-03-03 19:05:12 <tomsmeding> Guest_88: how is it wrong?
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