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Logs: liberachat/#haskell

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2021-06-23 21:30:58 ← safinaskar parts (~safinaska@109.252.90.89) ()
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2021-06-23 21:47:17 <pavonia> I'm trying to map a replacement function over a list that replaces elements from a list with corresponding elements from another list, e.g. map (replace [1,3] [10,30]) [1,2,3,4] => [10,2,30,4]. Is there a way to make the lookup for each element take constant time? Both Map and HashMap seem to have logarithmic lookup time
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2021-06-23 21:52:06 <dminuoso> pavonia: how would that work, exactly?
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2021-06-23 21:54:20 <pavonia> I was thinking about a "real" hash map. Is the no Haskell implementation?
2021-06-23 21:54:43 <dminuoso> a "real" hash map? constant time lookup? :-)
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2021-06-23 21:55:33 <dminuoso> That would requie perfect hashing
2021-06-23 21:55:49 <pavonia> When you have a large case expression, what is the lookup time for this structure internally?
2021-06-23 21:56:17 <dminuoso> Im not sure if GHC can translate this into a jump table
2021-06-23 21:57:23 <dminuoso> It seems so
2021-06-23 21:58:06 <pavonia> So which concrete data type would you suggest for fastest lookup?
2021-06-23 21:58:29 <dminuoso> Id start by profiling and ensuring this is even worth the trouble..
2021-06-23 21:58:46 <dminuoso> Do you have actual prof data? Or is this just a case of premature optimization
2021-06-23 21:59:22 <pavonia> It's more a theoretical question
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2021-06-23 22:00:09 <dminuoso> Hard to answer a theoretical question. Improving performance usually depends on what you're doing exactly
2021-06-23 22:00:13 <pavonia> That is performance doesn't matter in my case but I'm curious what would be the fastest lookup type
2021-06-23 22:00:51 <dminuoso> From what I can gather case-of is constant time and fast if GHC can translate it into a jump table
2021-06-23 22:01:54 <dminuoso> And then it depends on the scrutinee and the pattern clauses
2021-06-23 22:02:07 <pavonia> But you can't build such a case-expression dynamically, can you?
2021-06-23 22:02:35 <dminuoso> From what exactly?
2021-06-23 22:03:11 <dminuoso> generally, Id probably just use HashMap from unordered-containers as a first step if I want quick access
2021-06-23 22:03:30 <dminuoso> If that's not enough, then Id look into the specific issue at hand
2021-06-23 22:03:57 <pavonia> For two lists as in the example above
2021-06-23 22:04:12 <pavonia> So HashMap is generally faster than Map?
2021-06-23 22:06:53 <dminuoso> Generally yes
2021-06-23 22:07:12 <dminuoso> If the key is Int, then IntMap might (?) perform better, Im not sure
2021-06-23 22:07:22 <dminuoso> Also, Id throw in bytestring-tries into the mix
2021-06-23 22:07:37 <dminuoso> https://hackage.haskell.org/package/bytestring-trie
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2021-06-23 22:08:10 <dminuoso> pavonia: but keep in mind that HashMap is unordered
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2021-06-23 22:09:28 <monochrom> Premature generalization is the root of premature optimization.
2021-06-23 22:10:58 <monochrom> Ultimately it may come down to just telling you about -ddump-simpl -ddump-stg -ddump-opt-cmm -ddump-asm so you can see what happens to your specific case.
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2021-06-23 22:11:47 <monochrom> Because the other correct answer is "it depends".
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2021-06-23 22:16:01 <pavonia> dminuoso: Okay, thanks
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2021-06-23 22:35:05 <hseg> are newtype family instances not representationally equal to what they wrap?
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2021-06-23 22:36:00 <hseg> so given e.g. data family Sorted f; newtype instance Sorted [a] = SortedList {getSorted :: [a]}
2021-06-23 22:36:14 <hseg> coerce :: Sorted [a] -> [a] is forbidden?
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2021-06-23 22:38:14 <hseg> hrm... experimenting more shows this isn't what's going wrong, getting more data
2021-06-23 22:42:57 <hseg> oh ffs. is there a reason the (unordered-)containers haddocks don't show role annotations?
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