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2020-09-25 08:33:24 × Volt_ quits (~Volt_@c-73-145-164-70.hsd1.mi.comcast.net) (Quit: )
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2020-09-25 09:33:45 → justsomeguy joins (~justsomeg@unaffiliated/--/x-3805311)
2020-09-25 09:34:08 <justsomeguy> Is there a function like (!!) that also works for negative indices?
2020-09-25 09:37:24 <Rembane> justsomeguy: When you do let xs = [1,2,3,4] in xs !! (-2), what result do you expect?
2020-09-25 09:37:34 <justsomeguy> 3
2020-09-25 09:37:41 × Guest_73 quits (968f72e6@230.114.143.150.dyn.plus.net) (Remote host closed the connection)
2020-09-25 09:38:17 <solonarv> ah, indexing from the other end like python does?
2020-09-25 09:38:24 → breezykermo joins (~breezyker@p200300ed5f114200c95d7bbe0250101c.dip0.t-ipconnect.de)
2020-09-25 09:38:50 <Rembane> justsomeguy: You can do let f i xs = xs !! (length xs + i)
2020-09-25 09:38:56 <Rembane> justsomeguy: But it's incredibly expensive.
2020-09-25 09:38:58 <Jajik> then reverse it and use (!!) . abs, but the list is not the best structure for that
2020-09-25 09:39:28 <justsomeguy> Should I be using Data.Array, instead? (...and does it support negative indices?)
2020-09-25 09:39:56 <justsomeguy> solonarv: Exactly. I had pythons subscript notation in mind.
2020-09-25 09:39:56 <solonarv> if you want to index to arbitrary positions (especially near the end), you probably shouldn't be using lists, yes
2020-09-25 09:40:06 <MarcelineVQ> if you need arbitrary indexing vector or array will serve you better, on a list of 4 items I wouldn't sweat the small stuff
2020-09-25 09:40:11 <Rembane> justsomeguy: Use Data.Vector, it has a nicer API
2020-09-25 09:40:33 <solonarv> array or vector have efficient indexing (I recommend vector due to the nicer API, especially if you only care about Int indexes)
2020-09-25 09:40:52 <solonarv> it doesn't have this "wraparound" indexing but you can easily build it
2020-09-25 09:41:02 × ericsagnes quits (~ericsagne@2405:6580:0:5100:bc6f:f4f1:b8da:13b1) (Ping timeout: 260 seconds)
2020-09-25 09:41:57 <solonarv> xs !* n | n < 0 = xs ! (n + length xs) ; otherwise = xs ! n
2020-09-25 09:43:03 × plutoniix quits (~q@175.176.222.7) (Ping timeout: 260 seconds)
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2020-09-25 09:49:05 × heatsink quits (~heatsink@107-136-5-69.lightspeed.sntcca.sbcglobal.net) (Ping timeout: 240 seconds)
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2020-09-25 09:50:54 <phadej> what [1,2,3,4] !! -10 would do?
2020-09-25 09:51:24 → thir joins (~thir@p200300f27f0fc60094e773283d7bf825.dip0.t-ipconnect.de)
2020-09-25 09:51:27 <phadej> generally, I consider !! a smell in Haskell.
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2020-09-25 09:54:17 × Dolly quits (585fd1fd@ti0203q160-5312.bb.online.no) (Remote host closed the connection)
2020-09-25 09:54:23 <MarcelineVQ> that's the entire definition, modulo modulo
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