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2021-02-27 14:53:17 × emmanuel_erc quits (~user@2603-7000-9600-01c9-c589-d024-9ed2-1840.res6.spectrum.com) (Read error: Connection reset by peer)
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2021-02-27 15:11:52 hackage hkgr 0.2.7 - Simple Hackage release workflow for package maintainers https://hackage.haskell.org/package/hkgr-0.2.7 (JensPetersen)
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2021-02-27 15:20:26 × emmanuel_erc quits (~user@2603-7000-9600-01c9-c589-d024-9ed2-1840.res6.spectrum.com) (Read error: Connection reset by peer)
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2021-02-27 15:27:07 × emmanuel_erc quits (~user@2603-7000-9600-01c9-c589-d024-9ed2-1840.res6.spectrum.com) (Read error: Connection reset by peer)
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2021-02-27 15:47:29 × emmanuel_erc quits (~user@2603-7000-9600-01c9-c589-d024-9ed2-1840.res6.spectrum.com) (Read error: Connection reset by peer)
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2021-02-27 16:16:58 ixlun joins (~user@109.249.184.227)
2021-02-27 16:20:41 <ixlun> Hi all, does anyone know how I could map a function over the second element of a list of tuples?
2021-02-27 16:21:12 bitmagie joins (~Thunderbi@200116b8069d920024758e6b0c3524c9.dip.versatel-1u1.de)
2021-02-27 16:21:22 <Rembane> ixlun: second is a function that lets you do that
2021-02-27 16:21:22 × emmanuel_erc quits (~user@2603-7000-9600-01c9-c589-d024-9ed2-1840.res6.spectrum.com) (Read error: Connection reset by peer)
2021-02-27 16:21:23 <monochrom> map (\(x,y) -> (x, f y))
2021-02-27 16:21:24 <Rembane> :t second
2021-02-27 16:21:25 <lambdabot> Arrow a => a b c -> a (d, b) (d, c)
2021-02-27 16:21:45 <Rembane> That's not the type signature I had in mind...
2021-02-27 16:22:07 <monochrom> :)
2021-02-27 16:22:09 emmanuel_erc joins (~user@2603-7000-9600-01c9-c589-d024-9ed2-1840.res6.spectrum.com)
2021-02-27 16:22:19 <monochrom> Set a=(->) and you're alright.
2021-02-27 16:22:34 <dolio> Does second element mean second element of the list, or second value in every tuple?
2021-02-27 16:23:01 <ixlun> second element of every tuple
2021-02-27 16:23:11 <ixlun> say, [("a", 1), ("b", 2)] and then map ((+) 1), so that [("a", 2), ("b", 3)]
2021-02-27 16:23:55 <dolio> > (fmap.fmap) (+1) [("a",1),("b",2),("c",3)]
2021-02-27 16:23:57 <lambdabot> [("a",2),("b",3),("c",4)]
2021-02-27 16:24:37 <ixlun> whoa,
2021-02-27 16:24:45 emmanuel_erc parts (~user@2603-7000-9600-01c9-c589-d024-9ed2-1840.res6.spectrum.com) ()
2021-02-27 16:24:56 <ixlun> Looks like I need to study (fmap . fmap)
2021-02-27 16:25:10 nineonine joins (~nineonine@2604:3d08:7785:9600:8c3e:8d1a:de68:76d3)
2021-02-27 16:25:59 <monochrom> The 1st fmap is list's map. The 2nd fmap is "instance Functor ((,) a) where you apply f to the second element"

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