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2020-10-12 07:39:17 → fleursdumal joins (4832064b@gateway/web/cgi-irc/kiwiirc.com/ip.72.50.6.75)
2020-10-12 07:40:49 → merijn joins (~merijn@83-160-49-249.ip.xs4all.nl)
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2020-10-12 07:45:14 × heatsink quits (~heatsink@107-136-5-69.lightspeed.sntcca.sbcglobal.net) (Remote host closed the connection)
2020-10-12 07:46:03 × merijn quits (~merijn@83-160-49-249.ip.xs4all.nl) (Ping timeout: 260 seconds)
2020-10-12 07:46:57 hackage ttn 0.2.0.0 - Things Tracker Network JSON Types https://hackage.haskell.org/package/ttn-0.2.0.0 (srk)
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2020-10-12 07:59:28 hackage ttn-client 0.2.0.0 - TheThingsNetwork client https://hackage.haskell.org/package/ttn-client-0.2.0.0 (srk)
2020-10-12 07:59:34 → bahamas joins (~lucian@188.24.181.166)
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2020-10-12 07:59:34 → bahamas joins (~lucian@unaffiliated/bahamas)
2020-10-12 08:00:03 <bahamas> does anyone have an example of a function in the prelude that uses pattern matching in the definition? and another example that uses guards?
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2020-10-12 08:02:27 → snakemas1 joins (~snakemast@213.100.206.23)
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2020-10-12 08:04:00 → Ariakenom joins (~Ariakenom@193.254.193.1)
2020-10-12 08:04:09 <hc> bahamas: pattern matching: https://hackage.haskell.org/package/base-4.14.0.0/docs/src/GHC.List.html#head
2020-10-12 08:04:46 <hc> guards: https://hackage.haskell.org/package/base-4.14.0.0/docs/src/GHC.List.html#dropWhile
2020-10-12 08:05:46 → m0rphism joins (~m0rphism@HSI-KBW-046-005-177-122.hsi8.kabel-badenwuerttemberg.de)
2020-10-12 08:11:15 <bahamas> hc: thank you!
2020-10-12 08:11:15 × fleursdumal quits (4832064b@gateway/web/cgi-irc/kiwiirc.com/ip.72.50.6.75) (Quit: Connection closed)
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2020-10-12 08:14:02 <bahamas> hc: interesting definition for "take". it uses a guard without `otherwise`, but it doesn't seem to be a problem
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2020-10-12 08:15:56 × pfurla quits (~pfurla@ool-182ed2e2.dyn.optonline.net) (Ping timeout: 272 seconds)
2020-10-12 08:17:51 <hc> bahamas: it isn't a problem because of the ordering of patterns
2020-10-12 08:18:22 <hc> bahamas: if the list is empty, #2 will match regardless of the value of n, unless n<=0 in which case the 2nd parameter won't be evaluated and thus an empty list wouldn't be a problem here either
2020-10-12 08:18:44 <hc> the 3rd case will only be attempted to match if the list isn't empty
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2020-10-12 08:21:25 × drbean quits (~drbean@TC210-63-209-219.static.apol.com.tw) (Ping timeout: 240 seconds)
2020-10-12 08:22:05 <bahamas> hc: yes. btw, an exclamation mark in front of a function argument forces the evaluation, right?
2020-10-12 08:24:37 <hc> bahamas: I think so; at least that's the case in Data declarations
2020-10-12 08:25:12 → cfricke joins (~cfricke@unaffiliated/cfricke)
2020-10-12 08:25:45 <dminuoso> bahamas: https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/glasgow_exts.html#bang-patterns-informal
2020-10-12 08:27:02 × maroloccio quits (~marolocci@212.129.83.39) (Ping timeout: 244 seconds)
2020-10-12 08:29:23 tdammers_ is now known as tdammers
2020-10-12 08:31:02 <merijn> bahamas: btw, if all guards of a pattern fail it simply "falls through" to the next pattern of the function (similar to failing pattern matches) which can be useful in places :)
2020-10-12 08:31:08 × snakemas1 quits (~snakemast@213.100.206.23) (Ping timeout: 272 seconds)
2020-10-12 08:31:53 → maroloccio joins (~marolocci@212.129.83.39)
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2020-10-12 08:34:35 → DavidEichmann joins (~david@43.240.198.146.dyn.plus.net)
2020-10-12 08:34:52 <bahamas> merijn: right. I had forgotten about that. `otherwise` is a catch all
2020-10-12 08:35:08 <bahamas> dminuoso: thanks!
2020-10-12 08:35:10 → chaosmasttter joins (~chaosmast@p200300c4a72cce019c42f7589bbe6c59.dip0.t-ipconnect.de)
2020-10-12 08:35:27 <maerwald> @src otherwise
2020-10-12 08:35:27 <lambdabot> otherwise = True
2020-10-12 08:35:49 <bahamas> dminuoso: oh, so it's an extension. it's not part of the report
2020-10-12 08:36:09 <dminuoso> Right.
2020-10-12 08:36:19 <dminuoso> bahamas: Roughly, think it to be equivalent to `seq`
2020-10-12 08:36:29 <dminuoso> Perhaps, in hindsight, we should have had bang patterns instead of seq.
2020-10-12 08:36:57 <dminuoso> The ergonomics of bang patterns are much better. :)
2020-10-12 08:37:54 <dminuoso> So bang patterns are just syntactic sugar around Haskell2010, rather than introducing additional semantics.
2020-10-12 08:37:55 × yoja quits (~yoel.jaco@89.237.104.52) (Ping timeout: 246 seconds)
2020-10-12 08:38:16 <bahamas> I see
2020-10-12 08:39:12 <dminuoso> Then we could have defined `seq !l r = r`
2020-10-12 08:39:50 → RichardW joins (0140a8cb@1-64-168-203.static.netvigator.com)
2020-10-12 08:41:18 <bahamas> btw, judging from this file I assume there's an unwritten rule to put a fixity declaration at the top of a module? https://hackage.haskell.org/package/base-4.14.0.0/docs/src/GHC.Base.html#.
2020-10-12 08:41:57 <Taneb> bahamas: differnet libraries do it differently, I prefer to keep it close to the operator
2020-10-12 08:42:11 × plutoniix quits (~q@175.176.222.7) (Quit: Leaving)
2020-10-12 08:42:25 <Taneb> If you're defining a lot of operators with a lot of different fixities it can make things clearer how they relate if the fixity declarations are together, though
2020-10-12 08:42:57 <dminuoso> Though, you can quickly extract the latter knowledge by just `grep infix foo.hs`
2020-10-12 08:42:58 hackage Z-Data 0.1.6.1 - Array, vector and text https://hackage.haskell.org/package/Z-Data-0.1.6.1 (winterland)
2020-10-12 08:43:22 <bahamas> ok. it makes sense
2020-10-12 08:43:24 <dminuoso> Whereas relating a fixity declaration to its definition is not as easy, so I'd say keeping fixity declarations close to the definition is more useful
2020-10-12 08:44:15 <merijn> bahamas: No, I mean even in the absense of "otherwise"
2020-10-12 08:44:40 <merijn> bahamas: I'd say "put fixity near the definition", tbh
2020-10-12 08:45:36 <dminuoso> But really at the end, code convention is flexible and should fit your needs.
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2020-10-12 08:46:18 <nshepperd2> I'd always put it right next to the type signature
2020-10-12 08:46:28 <dminuoso> nshepperd2: with a semicolon?
2020-10-12 08:46:35 <dminuoso> Or do you mean above/below?
2020-10-12 08:46:40 × chaosmasttter quits (~chaosmast@p200300c4a72cce019c42f7589bbe6c59.dip0.t-ipconnect.de) (Ping timeout: 244 seconds)
2020-10-12 08:47:13 <nshepperd2> err, above
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2020-10-12 08:47:46 <nshepperd2> is a semicolon legal? that would be interesting
2020-10-12 08:48:09 <dminuoso> GHCi accepts it at least
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