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Logs: liberachat/#haskell

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2021-07-16 21:21:10 → eggplantade joins (~Eggplanta@108-201-191-115.lightspeed.sntcca.sbcglobal.net)
2021-07-16 21:21:38 <dsal> I just noticed in stdlib that `find` is defined as `find p = getFirst . foldMap (\ x -> First (if p x then Just x else Nothing))` -- does anyone have any opinions as to why that's better than the `foldr` that seems like an obvious thing to me.
2021-07-16 21:24:03 <c_wraith> it works better for data types that are more tree-like
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2021-07-16 21:24:19 <c_wraith> Hmm. Actually, I'm not sure of that.
2021-07-16 21:24:29 <c_wraith> I can't see any case where it's obviously better
2021-07-16 21:26:24 <hpc> :t foldMap
2021-07-16 21:26:25 <lambdabot> (Foldable t, Monoid m) => (a -> m) -> t a -> m
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2021-07-16 21:29:24 <boxscape> % :t \p -> alaf First foldMap \x -> [x | p x ]
2021-07-16 21:29:24 <yahb> boxscape: Foldable t => (b -> Bool) -> t b -> Maybe b
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2021-07-16 22:20:08 <c_wraith> Hmm. how does one make haddock render README.md into the index file?
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2021-07-16 22:38:33 <h98> I want a type family "Unwrap a" where if I write "newtype Foo = F Bar" then "Unwrap Foo = Bar"...is this impossible without writing it out explicitly because the left side of the newtype doesn't reference the wrapped type?
2021-07-16 22:42:02 <geekosaur> you might be interested in Coercible
2021-07-16 22:42:18 <geekosaur> in short, it already exists
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2021-07-16 22:45:13 <sm> or Witch
2021-07-16 22:48:18 <h98> yeah I know I can coerce (I can also just do it another way), I was just wondering if there was an easy way to write this as a type family
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2021-07-16 22:49:29 <h98> obviously Unwrap (f a) = a doesn't work because "Foo" doesn't match "f a" in "newtype Foo = F Bar"
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2021-07-16 22:55:45 <davean> h98: theres no information at the type level about what is in Foo, so no
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2021-07-16 22:56:41 <davean> coerce doesn't even do this, coerce talks about representations matching
2021-07-16 22:57:16 <h98> okay that makes sense; thanks!
2021-07-16 22:57:48 <davean> (This is what type role "nominal" deals with actually!)
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