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2021-08-15 19:12:25 <tomsmeding> perhaps that?
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2021-08-15 19:13:24 <kuribas> yes
2021-08-15 19:13:40 <kuribas> But also, generics are very hard to write, but usually end up with little code.
2021-08-15 19:14:11 <kuribas> It's all induction anyway, but getting the type variables and recursion right is tricky.
2021-08-15 19:14:22 <tomsmeding> perhaps C++ templates move into this direction?
2021-08-15 19:14:25 <[exa]> re fiddling, layered generic abstractions have pretty much lower chance to break without a compile error than in other languages. That's rewarding.
2021-08-15 19:14:32 <tomsmeding> also hard to write, but not necessarily producing much code in the end
2021-08-15 19:14:39 <monochrom> Haskell is not the only language in which I mess around two hours and get only 20 lines.
2021-08-15 19:15:05 <monochrom> I'm making exam questions. It takes 2 hours of messing around before I get 20 lines, too.
2021-08-15 19:15:15 <kuribas> monochrom: which language?
2021-08-15 19:15:22 <monochrom> English?
2021-08-15 19:15:49 <monochrom> It holds for Haskell exams, C & Unix exams, and data structure theoretical exams.
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2021-08-15 19:16:04 <[exa]> if english counts, I should start making stats from the papers we write
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2021-08-15 19:23:51 <HeisenLearnsHask> intercalate' :: [a] -> [[a]] -> [[a]]
2021-08-15 19:23:52 <HeisenLearnsHask> intercalate' _ [] = []
2021-08-15 19:23:52 <HeisenLearnsHask> intercalate' x (y:ys) = y:x:intercalate' x ys
2021-08-15 19:23:53 <HeisenLearnsHask> intercalate'' = concat . intercalate'
2021-08-15 19:24:12 <kuribas> HeisenLearnsHask: use pastebin?
2021-08-15 19:24:15 <HeisenLearnsHask> Can someone help me why I can't concat this?
2021-08-15 19:24:20 <HeisenLearnsHask> Oh sorry will do.
2021-08-15 19:24:26 <tomsmeding> (concat .) . intercalate'
2021-08-15 19:24:54 <tomsmeding> if you have (f :: a -> b) and (g :: b -> c), then you can do (g . f :: a -> c)
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2021-08-15 19:25:16 <tomsmeding> here, however, your f (which is intercalate') has type (a -> b -> c) and your g (concat) has type (c -> d)
2021-08-15 19:26:02 <tomsmeding> written out, the first is \x -> g (f x), and the second is \x y -> g (f x y)
2021-08-15 19:26:05 <tomsmeding> see the difference?
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2021-08-15 19:27:28 <monochrom> And "a -> b -> c" means "a -> foo, oh foo expands to b -> c", not "(a,b) -> c".
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2021-08-15 19:28:34 <tomsmeding> yeah: '\x y -> g (f x y)' is really shorthand for '\x -> (\y -> g (f x y))'
2021-08-15 19:29:50 <tomsmeding> is there a webpage or something that clearly explains this issue of why using (.) with a two-argument function doesn't work like one might want?
2021-08-15 19:30:07 <tomsmeding> it's a common question, it seems
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2021-08-15 19:30:27 <dsal> I've run into it a few times and just moved on without thinking about it too much. I'd read that web page someday.
2021-08-15 19:30:32 <tomsmeding> (which makes sense -- if you aren't yet familiar with how function types work in haskell, it's kind of opaque)
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2021-08-15 19:36:10 <monochrom> It can't be helped. Human nature always first consult "intuitive conceptual moral sounds-right first instinct", trying to procrastinate actually looking up and following actual rules.
2021-08-15 19:36:24 <tomsmeding> makes sense!
2021-08-15 19:36:34 <tomsmeding> I'm just looking for a link to dump whenever someone asks this here :p
2021-08-15 19:36:57 <monochrom> Conceptually . is a piping. Conceptually $ saves parentheses. Very attractive stories to tell and hear.
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2021-08-15 19:39:40 <dsal> Yeah. Stop making me think about what I'm doing.
2021-08-15 19:40:32 <monochrom> But there is not much more to explain than "you have (g::X->Y) . (f::A->(B->X)), B->X doesn't match with X".
2021-08-15 19:40:54 <tomsmeding> except then in a more accessible form with more examples :p
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2021-08-15 20:00:28 <dsal> Yeah. It's pretty easy to work out the understanding.
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2021-08-15 20:16:40 <zephyz> Hi there, I'm having issue with the singletons-th and singletons-base libraries, here is the error I get and the code I've written under it https://paste.tomsmeding.com/vj2xh7XX
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2021-08-15 20:17:31 <zephyz> It look slike singletons-th is generating the wrong names, or at least names that are not compatible with singletons-base, how can I fix that?
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2021-08-15 20:24:14 <HeisenLearnsHask> Hello could someone help me? I want to solve it with where binding not lambda. https://pastebin.com/TyVAsm9i
2021-08-15 20:25:30 <tomsmeding> HeisenLearnsHask: did you see our discussion of your question above?
2021-08-15 20:25:33 <monochrom> dropWhile (\x -> f x < 1000)
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2021-08-15 20:37:54 <monochrom> Or define your own .< operator as g .< n = \x -> g x < n, then you can use f .< 1000
2021-08-15 20:38:23 <monochrom> At which point it's abstraction overdose to rationalize a misguided intuition.
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