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Logs: freenode/#haskell

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2020-11-22 14:57:05 × halbGefressen quits (~christian@2a02:810d:f40:2a9c:40b2:2308:84bd:8b9b) (Quit: halbGefressen)
2020-11-22 14:57:16 → geowiesnot joins (~user@87-89-181-157.abo.bbox.fr)
2020-11-22 14:59:21 × dcoutts_ quits (~duncan@33.14.75.194.dyn.plus.net) (Ping timeout: 256 seconds)
2020-11-22 15:00:07 × boxscape quits (54a35f37@gateway/web/cgi-irc/kiwiirc.com/ip.84.163.95.55) (Quit: Connection closed)
2020-11-22 15:00:34 × toorevitimirp quits (~tooreviti@117.182.183.18) (Ping timeout: 246 seconds)
2020-11-22 15:00:37 → boxscape joins (54a35f37@gateway/web/cgi-irc/kiwiirc.com/ip.84.163.95.55)
2020-11-22 15:01:09 <ski> Feuermagier : well, one approach is to `zip' with indices, and then filter
2020-11-22 15:01:27 → supercoven joins (~Supercove@dsl-hkibng31-54fafd-230.dhcp.inet.fi)
2020-11-22 15:02:16 <Feuermagier> ski, interesting; maybe elemIndex zipped with thew lists.
2020-11-22 15:03:52 → mputz joins (~Thunderbi@dslb-084-058-211-084.084.058.pools.vodafone-ip.de)
2020-11-22 15:05:06 <Feuermagier> * Couldn't match expected type `[[Int]] -> Int -> Maybe (Int, Int)'
2020-11-22 15:05:06 <Feuermagier> with actual type `Maybe a0'
2020-11-22 15:05:16 <Feuermagier> ^why does this happen?
2020-11-22 15:05:20 <ski> missing arguments ?
2020-11-22 15:05:44 <Feuermagier> isn't my return Maybe (Int,Int)?
2020-11-22 15:06:00 <Feuermagier> shouldn't i be able to just return nothing?
2020-11-22 15:07:08 → erisco joins (~erisco@d24-57-249-233.home.cgocable.net)
2020-11-22 15:07:47 <ski> show code ?
2020-11-22 15:08:01 <Feuermagier> findIndex :: [[Int]] -> Int -> Maybe (Int,Int)
2020-11-22 15:08:01 <Feuermagier> findIndex = Nothing
2020-11-22 15:08:18 <ski> findIndex xss x = Nothing
2020-11-22 15:08:45 <Feuermagier> *oh*
2020-11-22 15:08:47 <Feuermagier> thx
2020-11-22 15:09:04 <ski> (missing arguments, as i thought)
2020-11-22 15:10:10 → Tario joins (~Tario@37.218.241.6)
2020-11-22 15:11:01 × gagbo quits (~gagbo@unaffiliated/gagbo) (Ping timeout: 264 seconds)
2020-11-22 15:11:19 → texasmynsted joins (~texasmyns@212.102.45.121)
2020-11-22 15:12:07 × Tario quits (~Tario@37.218.241.6) (Read error: Connection reset by peer)
2020-11-22 15:13:32 × bitmapper quits (uid464869@gateway/web/irccloud.com/x-pcjsdqzlpwhjwdiy) (Quit: Connection closed for inactivity)
2020-11-22 15:15:12 × xff0x quits (~fox@2001:1a81:53fc:6700:524e:d3cd:834f:b429) (Ping timeout: 260 seconds)
2020-11-22 15:15:55 → wroathe joins (~wroathe@c-68-54-25-135.hsd1.mn.comcast.net)
2020-11-22 15:16:00 → xff0x joins (~fox@2001:1a81:53fc:6700:7028:2716:1053:ff98)
2020-11-22 15:16:56 → Entertainment joins (~entertain@104.246.132.210)
2020-11-22 15:18:03 × mputz quits (~Thunderbi@dslb-084-058-211-084.084.058.pools.vodafone-ip.de) (Ping timeout: 256 seconds)
2020-11-22 15:18:43 → Fractalis joins (~Fractalis@2601:987:280:8d40:eda9:f9e1:2072:cea7)
2020-11-22 15:18:57 → mnrmnaughmnrgle joins (~mnrmnaugh@unaffiliated/mnrmnaugh)
2020-11-22 15:18:58 × invaser quits (~Thunderbi@31.148.23.125) (Ping timeout: 260 seconds)
2020-11-22 15:20:40 × wroathe quits (~wroathe@c-68-54-25-135.hsd1.mn.comcast.net) (Ping timeout: 256 seconds)
2020-11-22 15:23:35 × hekkaidekapus quits (~tchouri@gateway/tor-sasl/hekkaidekapus) (Quit: hekkaidekapus)
2020-11-22 15:23:57 → Haskellovic joins (58d9b4d1@aftr-88-217-180-209.dynamic.mnet-online.de)
2020-11-22 15:24:37 <Haskellovic> twoThirdsAverageWinners :: [(String, Int)] -> [String]
2020-11-22 15:24:39 <Haskellovic> - snd (head xs)) = helper (tail xs) average ([] : fst (head xs)) (toPositiv (average - snd (head xs)))
2020-11-22 15:25:27 <Haskellovic> Can someone tell me why the helper function expects this
2020-11-22 15:25:36 → hekkaidekapus joins (~tchouri@gateway/tor-sasl/hekkaidekapus)
2020-11-22 15:25:37 <Haskellovic> [([[String]], Int)]
2020-11-22 15:25:41 <Haskellovic> for gs
2020-11-22 15:26:13 <Haskellovic> when i want [(String, Int)
2020-11-22 15:26:20 <Haskellovic> when i want [(String, Int)]
2020-11-22 15:27:38 × boxscape quits (54a35f37@gateway/web/cgi-irc/kiwiirc.com/ip.84.163.95.55) (Ping timeout: 260 seconds)
2020-11-22 15:30:09 → urodna joins (~urodna@unaffiliated/urodna)
2020-11-22 15:30:41 <Feuermagier> how can I "unpack" a maybe?
2020-11-22 15:30:57 × carlomagno quits (~cararell@148.87.23.4) (Remote host closed the connection)
2020-11-22 15:31:23 jess is now known as j
2020-11-22 15:31:54 <geekosaur> usually with pattern matching
2020-11-22 15:34:06 × cads quits (~cads@ip-64-72-99-232.lasvegas.net) (Ping timeout: 265 seconds)
2020-11-22 15:34:17 mnrmnaughmnrgle is now known as find
2020-11-22 15:35:10 <Feuermagier> fromJust is what i needed. thx anyway!
2020-11-22 15:35:46 <geekosaur> fromJust is rarely what you want
2020-11-22 15:36:07 <geekosaur> at least if what you want includes your program not crashing
2020-11-22 15:36:13 <Feuermagier> geekosaur, I already checked nothing earlier. It will not occur.
2020-11-22 15:38:06 → phaul joins (~phaul@ruby/staff/phaul)
2020-11-22 15:38:17 find is now known as awk
2020-11-22 15:39:26 <hekkaidekapus> > maybe 0 (+ 1) <$> [Just 1, Nothing] -- Feuermagier
2020-11-22 15:39:29 <lambdabot> [2,0]
2020-11-22 15:40:43 <Feuermagier> hekkaidekapus, what?
2020-11-22 15:41:09 <hekkaidekapus> > fromMaybe 0 <$> [Just 1, Nothing]
2020-11-22 15:41:11 <lambdabot> [1,0]
2020-11-22 15:41:14 → Gurkenglas joins (~Gurkengla@unaffiliated/gurkenglas)
2020-11-22 15:41:31 <Feuermagier> I still have no idea what that does :D
2020-11-22 15:41:38 <Feuermagier> what does <$> do?
2020-11-22 15:41:45 <merijn> <$> is just fmap as operator
2020-11-22 15:41:54 <merijn> and fmap for lists is just map
2020-11-22 15:41:55 × tabemann quits (~tabemann@172-13-49-137.lightspeed.milwwi.sbcglobal.net) (Remote host closed the connection)
2020-11-22 15:41:58 → kav_ joins (~kari@dsl-hkibng42-56733f-225.dhcp.inet.fi)
2020-11-22 15:41:58 × kav_ quits (~kari@dsl-hkibng42-56733f-225.dhcp.inet.fi) (Client Quit)
2020-11-22 15:42:09 → machinedgod joins (~machinedg@24.105.81.50)
2020-11-22 15:42:58 <hekkaidekapus> > map (+ 1) [5 .. 9]
2020-11-22 15:43:00 <lambdabot> [6,7,8,9,10]
2020-11-22 15:43:04 <hekkaidekapus> > fmap (+ 1) [5 .. 9]
2020-11-22 15:43:06 <lambdabot> [6,7,8,9,10]
2020-11-22 15:43:11 × Haskellovic quits (58d9b4d1@aftr-88-217-180-209.dynamic.mnet-online.de) (Remote host closed the connection)
2020-11-22 15:43:16 <hekkaidekapus> > (+ 1) <$> [5 .. 9]
2020-11-22 15:43:19 <lambdabot> [6,7,8,9,10]
2020-11-22 15:43:28 <hekkaidekapus> > (+ 1) `map` [5 .. 9]
2020-11-22 15:43:31 <lambdabot> [6,7,8,9,10]
2020-11-22 15:43:35 <hekkaidekapus> > (+ 1) `fmap` [5 .. 9]
2020-11-22 15:43:37 <lambdabot> [6,7,8,9,10]
2020-11-22 15:44:13 → tabemann joins (~tabemann@172-13-49-137.lightspeed.milwwi.sbcglobal.net)
2020-11-22 15:44:16 × awk quits (~mnrmnaugh@unaffiliated/mnrmnaugh) (Quit: Leaving)
2020-11-22 15:44:20 → cole-h joins (~cole-h@c-73-48-197-220.hsd1.ca.comcast.net)
2020-11-22 15:44:22 × whatisRT quits (~whatisRT@2002:5b41:6a33:0:1094:8ebf:d3e9:e277) (Ping timeout: 260 seconds)
2020-11-22 15:45:00 → awk joins (~mnrmnaugh@unaffiliated/mnrmnaugh)
2020-11-22 15:47:00 <Feuermagier> I want to call a function with different arguments (1 to 10 for example). if it returns aomething else than an empty list, I want to short circuit return that. if it only returns an empty lists, I return that as well.
2020-11-22 15:47:16 <Feuermagier> I'm sure there's a really elegant way to do this
2020-11-22 15:48:01 <hekkaidekapus> Feuermagier: Show us what you wrote so far.
2020-11-22 15:48:14 <hekkaidekapus> @where paste -- Feuermagier
2020-11-22 15:48:14 <lambdabot> Help us help you: please paste full code, input and/or output at eg https://paste.tomsmeding.com
2020-11-22 15:48:53 <Feuermagier> hekkaidekapus, sec, i'll need to formulate a simple example.
2020-11-22 15:49:07 <hekkaidekapus> Take your time.
2020-11-22 15:50:00 → czwartyeon joins (~czwartyeo@77-45-55-99.sta.asta-net.com.pl)
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