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2021-06-15 09:07:16 <cheater> how can I do this in Haskell? https://pastebin.com/Dyjf11Gu
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2021-06-15 09:12:22 <nitrix> % do { xs <- ["a", "Bbb", "ccc", "EEE"]; ys <- ["bBb", "DDdD", "eeE"]; return (xs, ys, map toLower xs == map toLower ys) }
2021-06-15 09:12:22 <yahb> nitrix: [("a","bBb",False),("a","DDdD",False),("a","eeE",False),("Bbb","bBb",True),("Bbb","DDdD",False),("Bbb","eeE",False),("ccc","bBb",False),("ccc","DDdD",False),("ccc","eeE",False),("EEE","bBb",False),("EEE","DDdD",False),("EEE","eeE",True)]
2021-06-15 09:13:14 <nitrix> Lists are monads and they chain (>>=) by combining each of their elements together, exactly like your two nested loops.
2021-06-15 09:13:47 <nitrix> You can use `do` notation, the `>>=` operator or even a list comprehension. All are pretty readable.
2021-06-15 09:16:27 × ddellacosta quits (~ddellacos@89.45.224.34) (Ping timeout: 272 seconds)
2021-06-15 09:17:13 <cheater> that's incorrect. you are matching the keys incorrectly.
2021-06-15 09:17:19 <cheater> or rather the values.
2021-06-15 09:17:26 <cheater> EEE should be compared with eeE.
2021-06-15 09:17:37 <cheater> and Bbb with bBb.
2021-06-15 09:18:08 <cheater> oh, i see what you're doing
2021-06-15 09:18:30 <cheater> so how do I know to include "a" but also to include "bBb" and not "Bbb"?
2021-06-15 09:22:05 <nitrix> It would need to return the first comparison that is successful instead of all the comparisons. You can return a list of a single String, like [String] and concatenate them all, or use Maybe String and use that monad instead (catMaybes, >>=, whatever).
2021-06-15 09:22:14 → nsilv1 joins (~nsilv@host-82-50-119-12.retail.telecomitalia.it)
2021-06-15 09:22:28 <cheater> i don't know how i would do that. it's a bit confusing.
2021-06-15 09:22:35 <cheater> also... it all looks pretty inelegant
2021-06-15 09:22:35 × nsilv quits (~nsilv@212.103.198.210) (Ping timeout: 272 seconds)
2021-06-15 09:23:06 × dunkeln quits (~dunkeln@94.129.65.28) (Ping timeout: 264 seconds)
2021-06-15 09:23:34 <nitrix> Or literally translate your code to haskell. For the map, do a map, for the for+if+return do a filter+headSafe.
2021-06-15 09:24:02 × pe200012 quits (~pe200012@58.248.179.134) (Ping timeout: 244 seconds)
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2021-06-15 09:24:33 <nitrix> One sec.
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2021-06-15 09:25:26 × brian_da_mage quits (~Neuromanc@user/briandamag) (Ping timeout: 252 seconds)
2021-06-15 09:27:45 × mikoto-chan quits (~mikoto-ch@ip-213-49-189-31.dsl.scarlet.be) (Quit: mikoto-chan)
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2021-06-15 09:29:24 × yd502 quits (~yd502@180.168.212.6) (Ping timeout: 244 seconds)
2021-06-15 09:30:02 <nitrix> % let xs = ["a", "Bbb", "ccc", "EEE"]; ys = ["bBb", "DDdD", "eeE"] in map (\e -> listToMaybe $ catMaybes $ map (\f -> if map toLower e == map toLower f then Just f else Nothing ) ys) xs
2021-06-15 09:30:03 <yahb> nitrix: [Nothing,Just "bBb",Nothing,Just "eeE"]
2021-06-15 09:30:16 <nitrix> It's pretty unreadable as a one-liner.
2021-06-15 09:31:03 <nitrix> And you can probably use the nicer abstractions for manipulating the [String] and Maybe String.
2021-06-15 09:32:10 <nitrix> I would be more useful if I had used Haskell more recently :P
2021-06-15 09:33:25 <cheater> nitrix: also it doesn't include "a" or "ccc"
2021-06-15 09:34:10 <nitrix> Oh you have return x at the end.
2021-06-15 09:34:11 → kenran joins (~kenran@b2b-37-24-119-190.unitymedia.biz)
2021-06-15 09:37:09 <Rembane> > let xs = ["a", "Bbb", "ccc", "EEE"]; ys = ["bBb", "DDdD", "eeE"] in [x | x <- xs, y <- ys, toLower x == toLower y]
2021-06-15 09:37:11 <lambdabot> error:
2021-06-15 09:37:11 <lambdabot> • Couldn't match expected type ‘Char’ with actual type ‘[Char]’
2021-06-15 09:37:11 <lambdabot> • In the first argument of ‘toLower’, namely ‘x’
2021-06-15 09:37:16 × fef quits (~thedawn@user/thedawn) (Ping timeout: 252 seconds)
2021-06-15 09:38:48 <Rembane> > let xs = ["a", "Bbb", "ccc", "EEE"]; ys = ["bBb", "DDdD", "eeE"] in [x | x <- xs, y <- ys, map toLower x == map toLower y]
2021-06-15 09:38:48 <nitrix> That'll be like the first version I posted. He wants the first element from the second list that matches the current element from the first list (the matching is case insensitive, but the result needs to be sensitive).
2021-06-15 09:38:49 <lambdabot> ["Bbb","EEE"]
2021-06-15 09:39:29 <Rembane> Oh
2021-06-15 09:39:35 <nitrix> And, no matches is treated successfully too, it's a bit of an odd one.
2021-06-15 09:39:41 × dunkeln quits (~dunkeln@94.129.65.28) (Ping timeout: 272 seconds)
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