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2020-10-02 21:44:47 × johs quits (sid246410@gateway/web/irccloud.com/x-mkeicffdlyarxtfa) (Ping timeout: 240 seconds)
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2020-10-02 22:26:27 hackage fourmolu 0.2.0.0 - A formatter for Haskell source code https://hackage.haskell.org/package/fourmolu-0.2.0.0 (GeorgeThomas)
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2020-10-02 22:43:19 × GyroW quits (~GyroW@unaffiliated/gyrow) (Ping timeout: 260 seconds)
2020-10-02 22:45:30 × o1lo01ol1o quits (~o1lo01ol1@bl11-140-216.dsl.telepac.pt) (Remote host closed the connection)
2020-10-02 22:46:02 × conal quits (~conal@107.181.166.148) (Quit: Computer has gone to sleep.)
2020-10-02 22:48:00 × jb55 quits (~jb55@gateway/tor-sasl/jb55) (Read error: Connection reset by peer)
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2020-10-02 22:57:31 × conal quits (~conal@107.181.166.148) (Quit: Computer has gone to sleep.)
2020-10-02 22:57:53 <monochrom> http://www.vex.net/~trebla/tmp/hasdoc :)
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2020-10-02 23:52:58 hackage pandoc-plot 0.9.4.0 - A Pandoc filter to include figures generated from code blocks using your plotting toolkit of choice. https://hackage.haskell.org/package/pandoc-plot-0.9.4.0 (LaurentRDC)
2020-10-02 23:54:52 × Stanley00 quits (~stanley00@unaffiliated/stanley00) (Ping timeout: 246 seconds)
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2020-10-03 00:00:01 × tomatopotato quits (~tomatopot@188.126.89.194) ()
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2020-10-03 00:14:47 <inkbottle> variadic/dyadic fixed point: I don't understand the 6th line of code; is there a mistyping (why the `~`)? https://web.archive.org/web/20160304101809/http://osdir.com/ml/lang.haskell.cafe/2003-10/msg00211.html
2020-10-03 00:14:55 × shatriff quits (~vitaliish@188.163.30.117) (Remote host closed the connection)
2020-10-03 00:15:31 aaaaaa parts (~ArthurStr@host-91-90-11-12.soborka.net) ()
2020-10-03 00:15:41 <inkbottle> polyvariadic*
2020-10-03 00:17:01 × Gurkenglas quits (~Gurkengla@unaffiliated/gurkenglas) (Ping timeout: 264 seconds)
2020-10-03 00:17:44 <ski> inkbottle : lazy/irrefutable pattern-match
2020-10-03 00:19:08 <koz_> ski: What's the idea behind irrefutable pattern matches? How do they differ from regular ones?
2020-10-03 00:19:46 × snakemasterflex quits (~snakemast@213.100.206.23) (Ping timeout: 272 seconds)
2020-10-03 00:20:15 <ski> if you have a pattern like e.g. `x:xs', it will check, when matching, whether the list is non-empty .. and if it's empty, it'll discard this case, and try the next instead
2020-10-03 00:20:27 <inkbottle> ski: right, thanks
2020-10-03 00:20:49 <ski> but, with an irrefutable pattern `~(x:xs)', the pattern-matching will always succeed, immediately, regardless of whether the list is empty or not
2020-10-03 00:21:48 <ski> only when you actually try to access the value of `x' ior `xs', will it try to match the list with `x:xs' (and if that fails, you get a pattern-match failure. it won't "travel back in time" to try the next alternative/case. it's already too late for that)
2020-10-03 00:21:49 × wroathe quits (~wroathe@c-73-24-27-54.hsd1.mn.comcast.net) (Ping timeout: 265 seconds)
2020-10-03 00:21:54 <ski> now, consider
2020-10-03 00:21:58 <ski> @src partition
2020-10-03 00:21:58 <lambdabot> partition p xs = foldr (select p) ([],[]) xs
2020-10-03 00:21:59 <lambdabot> where select p x ~(ts,fs) | p x = (x:ts,fs)
2020-10-03 00:21:59 <lambdabot> | otherwise = (ts, x:fs)
2020-10-03 00:22:30 <ski> > let (evens,odds) = partition even [0 ..] in (take 4 evens,take 4 odds)
2020-10-03 00:22:32 <lambdabot> ([0,2,4,6],[1,3,5,7])
2020-10-03 00:22:38 <ski> and compare this with
2020-10-03 00:23:22 <ski> @let partition' p xs = foldr (select' p) ([],[]) xs where select' p x (ts,fs) p x = (x:ts,fs) | otherwise = (ts,x:fs)
2020-10-03 00:23:22 <lambdabot> Parse failed: Parse error: |
2020-10-03 00:23:27 <ski> er

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