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2025-03-31 01:36:35 +0200 <monochrom> Is "we need to focus" a pun, given the context of lens? >:)
2025-03-31 01:40:33 +0200merijn(~merijn@host-vr.cgnat-g.v4.dfn.nl) merijn
2025-03-31 01:41:11 +0200 <haskellbridge> <thirdofmay18081814goya> "under (from enumerateIso) (filter (even . fst)) ['a'..'z']" 😎😎😎😎😎😎😎😎😎
2025-03-31 01:42:18 +0200gustavo(~gustavo@2804:18:588d:4c8:c297:170d:745e:29df) GusCtSr
2025-03-31 01:42:39 +0200 <haskellbridge> <thirdofmay18081814goya> probably a more idiomatic way to do this, but it's a start
2025-03-31 01:42:42 +0200acidjnk(~acidjnk@p200300d6e71c4f6101a7bfc96b38a12d.dip0.t-ipconnect.de) (Ping timeout: 272 seconds)
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2025-03-31 01:56:21 +0200merijn(~merijn@host-vr.cgnat-g.v4.dfn.nl) merijn
2025-03-31 02:06:24 +0200ljdarj1(~Thunderbi@user/ljdarj) ljdarj
2025-03-31 02:10:15 +0200ljdarj(~Thunderbi@user/ljdarj) (Ping timeout: 244 seconds)
2025-03-31 02:10:15 +0200ljdarj1ljdarj
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2025-03-31 02:14:40 +0200 <haskellbridge> <alexfmpe> > ['a'..'z']^..traversed.ifiltered (const . even)
2025-03-31 02:14:40 +0200 <haskellbridge> "acegikmoqsuwy"
2025-03-31 02:15:09 +0200 <haskellbridge> <alexfmpe> * ['a'..'z'] ^.. traversed . ifiltered
2025-03-31 02:16:21 +0200 <haskellbridge> <thirdofmay18081814goya> neat! still indexed though
2025-03-31 02:16:53 +0200 <haskellbridge> <alexfmpe> huh is that an issue?
2025-03-31 02:17:15 +0200 <haskellbridge> <thirdofmay18081814goya> well I'm trying to find an "Iso" form, otherwise we can just use "['a'..'z'] ^.. itraversed . indices even"
2025-03-31 02:17:54 +0200hattckory(~hattckory@bras-base-toroon4524w-grc-30-70-27-118-207.dsl.bell.ca) (Ping timeout: 260 seconds)
2025-03-31 02:17:54 +0200 <haskellbridge> <alexfmpe> iso between what?
2025-03-31 02:18:06 +0200 <haskellbridge> <thirdofmay18081814goya> "iso (map snd) (zip [0..])"
2025-03-31 02:18:13 +0200 <haskellbridge> <thirdofmay18081814goya> uh "map fst" I mean
2025-03-31 02:18:21 +0200 <haskellbridge> <alexfmpe> that is not an isomorphism
2025-03-31 02:18:43 +0200 <haskellbridge> <thirdofmay18081814goya> how so?
2025-03-31 02:19:02 +0200 <haskellbridge> <alexfmpe> you're thinking "Iso' [a] [(Int, a)]" or so right?
2025-03-31 02:19:20 +0200 <haskellbridge> <thirdofmay18081814goya> clearly it is a bijection, and if we're embedding either side into a monoid wrt "a" it is an isomorphism
2025-03-31 02:19:26 +0200 <haskellbridge> <thirdofmay18081814goya> alexfmpe: yeah
2025-03-31 02:19:51 +0200 <haskellbridge> <alexfmpe> [1, 'a'] -> ['a'] <-> [(0, 'a')]
2025-03-31 02:19:53 +0200 <haskellbridge> <alexfmpe> this is no bijection
2025-03-31 02:19:58 +0200 <haskellbridge> <alexfmpe> it's an embedding at best
2025-03-31 02:20:11 +0200 <haskellbridge> <thirdofmay18081814goya> right, that has the same type but it is not the same map
2025-03-31 02:20:22 +0200 <haskellbridge> <alexfmpe> "[a] -> [(Int, a)]" is invertible, but not surjective
2025-03-31 02:20:30 +0200 <haskellbridge> <alexfmpe> so not bijective
2025-03-31 02:21:06 +0200 <haskellbridge> <alexfmpe> well, my point is "zip [0..] . fmap snd" is not "id"
2025-03-31 02:21:12 +0200 <haskellbridge> <alexfmpe> even though "fmap snd . zip [0..]" is
2025-03-31 02:21:16 +0200 <haskellbridge> <alexfmpe> so it's not an iso
2025-03-31 02:21:54 +0200hattckory(~hattckory@bras-base-toroon4524w-grc-30-70-27-118-207.dsl.bell.ca)
2025-03-31 02:23:00 +0200 <haskellbridge> <thirdofmay18081814goya> hm right
2025-03-31 02:30:28 +0200 <haskellbridge> <thirdofmay18081814goya> it is however an isomorphism over its range, or over the subtype of "[(Int, a)]" of pairs ordered by the first element
2025-03-31 02:31:45 +0200 <haskellbridge> <thirdofmay18081814goya> as long as all function we compose it preserve this range, it will have the expected properties of "Iso"
2025-03-31 02:31:52 +0200 <haskellbridge> <thirdofmay18081814goya> we compose it with*
2025-03-31 02:32:13 +0200califax(~califax@user/califx) (Remote host closed the connection)
2025-03-31 02:33:17 +0200califax(~califax@user/califx) califx
2025-03-31 02:34:06 +0200 <haskellbridge> <thirdofmay18081814goya> but right the type system can't enforce the well typedness of such an "Iso" and it is not strictly speaking an member of "Iso' [a] [(Int, a)]"
2025-03-31 02:34:47 +0200ljdarj(~Thunderbi@user/ljdarj) (Ping timeout: 265 seconds)
2025-03-31 02:34:57 +0200hattckory(~hattckory@bras-base-toroon4524w-grc-30-70-27-118-207.dsl.bell.ca) (Ping timeout: 248 seconds)
2025-03-31 02:38:35 +0200 <haskellbridge> <thirdofmay18081814goya> yep no it's just straight up not an Iso lol ty
2025-03-31 02:38:40 +0200 <haskellbridge> <Bowuigi> To fix this, constrain the first element to be exactly the index. The singleton Vector example does this
2025-03-31 02:39:03 +0200 <haskellbridge> <Bowuigi> The first element of "(Int, a)", that is
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2025-03-31 09:15:59 +0200Lord_of_Life_(~Lord@user/lord-of-life/x-2819915) Lord_of_Life
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2025-03-31 09:50:01 +0200 <hellwolf> Question about Lens
2025-03-31 09:50:01 +0200 <hellwolf> This is Iso: type Iso s t a b = forall p f. (Profunctor p, Functor f) => p a (f b) -> p s (f t)
2025-03-31 09:50:27 +0200 <hellwolf> What if there is no functor instance: forall p. Profunctor p => p a b -> p s t
2025-03-31 09:50:29 +0200 <hellwolf> what is it?
2025-03-31 09:51:29 +0200 <EvanR> you mean f = Identity ?
2025-03-31 09:56:38 +0200merijn(~merijn@77.242.116.146) merijn
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2025-03-31 10:11:45 +0200vanishingideal(~vanishing@user/vanishingideal) (Ping timeout: 252 seconds)
2025-03-31 10:12:34 +0200vgtw(~vgtw@user/vgtw) vgtw
2025-03-31 10:13:20 +0200 <Leary> hellwolf: Should be equivalent. `f = Identity` gives you one direction and `p = PostCompose f q` the other, where `newtype PostCompose f q x y = MkPC (q x (f y))`.
2025-03-31 10:13:32 +0200 <[exa]> is there some library way to avoid writing (\(a,b) (c,d) -> (a+c, b+d)) ?
2025-03-31 10:15:40 +0200 <Leary> Yes, pester the CLC to let `instance (Num a, Num b) => Num (a, b)` into base.
2025-03-31 10:15:48 +0200hattckory(~hattckory@bras-base-toroon4524w-grc-30-70-27-118-207.dsl.bell.ca) (Ping timeout: 276 seconds)
2025-03-31 10:16:40 +0200 <[exa]> Leary: /me sad
2025-03-31 10:17:25 +0200acidjnk(~acidjnk@p200300d6e71c4f6101a7bfc96b38a12d.dip0.t-ipconnect.de) (Ping timeout: 248 seconds)
2025-03-31 10:17:55 +0200 <[exa]> I somehow thought this would be in tuple.extra or in bifunctors, so that I could at least write something like `zipBoth (+) (+)` but nope
2025-03-31 10:18:03 +0200pie_(~pie_bnc@user/pie/x-2818909) ()
2025-03-31 10:18:15 +0200pie_(~pie_bnc@user/pie/x-2818909) __
2025-03-31 10:18:38 +0200 <Leary> Well, `biliftA2` could be your `zipBoth`.
2025-03-31 10:18:48 +0200vanishingideal(~vanishing@user/vanishingideal) vanishingideal
2025-03-31 10:18:59 +0200 <[exa]> ooooh good
2025-03-31 10:20:09 +0200 <[exa]> cool, thanks
2025-03-31 10:20:42 +0200 <[exa]> (btw this is for use in a fold, I was mildly annoyed that Bifoldable actually doesn't fold the 2 things in parallel but it squashes them together)
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2025-03-31 10:21:39 +0200merijn(~merijn@77.242.116.146) (Ping timeout: 260 seconds)
2025-03-31 10:21:47 +0200 <Leary> In that case, you can leverage the fact that we /do/ have `instance (Monoid a, Monoid b) => Monoid (a, b)` and use `(Sum a, Sum b)`.
2025-03-31 10:22:09 +0200 <[exa]> ah wait true
2025-03-31 10:22:23 +0200 <[exa]> that's actually very lawfully lawful and thus in base, right
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2025-03-31 10:45:57 +0200edwtjo(~edwtjo@fsf/member/edwtjo) edwtjo
2025-03-31 10:46:12 +0200 <[exa]> Leary: turns out base even has Num a => Num (Sum a) so I don't even have to write the Sum anywhere. Thanks!
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2025-03-31 13:13:14 +0200lortabac(~lortabac@2a01:e0a:541:b8f0:55ab:e185:7f81:54a4) lortabac
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2025-03-31 13:38:44 +0200 <haskellbridge> <alexfmpe> [exa]: bimap (+) (+)
2025-03-31 13:39:19 +0200internatetional(~nate@2400:9800:340:7034:1:0:8d4b:9648) internatetional
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