This channel is intended for people just starting with the Raku Programming Language (raku.org). Logs are available at irclogs.raku.org/raku-beginner/live.html
Set by lizmat on 8 June 2022.
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disbot6 <jubilatious1_98524> @simon_sibl This might have been mentioned already, but\S+ is probably better (faster?) than <-[\s]>+ . And since you are searching linewise you could do \H+ (for non-horizontal-whitespace characters) instead of \S+. 03:21
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disbot6 <jubilatious1_98524> @simon_sibl otherwise my guess is named-captures in Raku are slow. (for now). 03:39
<jubilatious1_98524> @simon_sibl BTW, what happens if you try m{ ... } instead of rx{ ... } ? 03:41
<simon_sibl> I tried with both rx and m, I replaced the <-[\s]>+ with <[\H]>+ and used "simple" group, not matching group (using $0 and $1 instead of the name) but the speed doesnt change much from before 03:53
<simon_sibl> actually sometimes the one without named group is slower 🫤 03:54
<jubilatious1_98524> My understanding is it's all due to start-up time. I tried having the code chew on a 6.7MB file and th difference was still ~17 fold. 04:01
<jubilatious1_98524> Small file (weblog example): real 0m0.161s user 0m0.199s sys 0m0.029s 04:03
<jubilatious1_98524> large txt file (6.7 MB): real 0m0.265s user 0m0.306s sys 0m0.035s 04:05
<jubilatious1_98524> (above time are for your last Raku code example)
<rcmlz> Putting code (e.g. a Grammar) in a module and enjoy pre-compilation is also not helping much? 04:36
<simon_sibl> Perl is around 0m0.007s How come the difference is so big 05:12
<simon_sibl> ccccccuegdkcelhdngfhbkhkvbjnigttivicglbgjdtd 05:36
<simon_sibl> ccccccuegdkcevrgjjvccjvhbhkjihuincbbrkfgvnft
<simon_sibl> (wrong manip with yubikey) 05:37
<simon_sibl> perl unit module Exo; my regex r is export { coderbyte \s heroku \/ router # match coderbyte heroku/router .+ # anything until... request_id \= (<[\S]>+) # capture the request_id \s # until a space is found fwd \= \"(<-["]>+)\" # capture fwd within "" } would this be enough to get pre-compilation ? 05:52
<simon_sibl> because it performs worse 😆 maybe because it requires extra efforts to import the module ? no idea 05:53
<simon_sibl> # with 32mb file (repeated the same content) # perl /x real 0m0.188s user 0m0.188s sys 0m0.000s # perl named group real 0m0.141s user 0m0.133s sys 0m0.008s # raku numbered group real 0m1.943s user 0m2.005s sys 0m0.040s # raku named group real 0m1.887s user 0m1.961s sys 0m0.028s # raku using module real 0m1.985s user 0m2.075s sys 0m0.056s 05:55
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disbot6 <jubilatious1_98524> I just remember 200msec startup. Not sure if that problem has been solved yet. You can see from the numbers I've posted a 6.7 MB file only takes 100ms more time to process as compared to a tiny 3KB file. 05:56
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disbot6 <simon_sibl> would hyper helps to speed up ? 06:05
<jubilatious1_98524> There are problems with hyper and regexes, lemme find the Github issue:
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disbot6 <jubilatious1_98524> Not this one, but close: github.com/rakudo/rakudo/issues/5583 06:11
<jubilatious1_98524> I found it in a comment here: github.com/rakudo/rakudo/issues/12...2902236406 06:17
<simon_sibl> hmmm indeed 06:27
<simon_sibl> well so far really dont need performance, but worth noting the difference in speed with Perl
<jubilatious1_98524> Yeah, it's something to consider. 06:31
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disbot6 <simon_sibl> I have two questions about this my @fib = 0, 1, 1, *+* ... Inf 1. How come its so performant ? unlike the sub version which is recursive ? (didnt try with for loop) 2. How does it know with *+* that it should take the two last number from the list and not twice the last one ? 07:04
<simon_sibl> I guess I could just use {$^a+$^a} for the second question 07:13
<ng0177> discourse.nixos.org/t/development-...ix/68028/6 just in case s.o. finds this helpful 07:22
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disbot6 <simon_sibl> I am not sure to understand the str native type, and the difference with Str I wanted to do c_function_init("Name", 23); and the signature is str, uint8 but that one didnt work, I had to change to CArray[uint8] and pass the string as CArray[uint8].new("Name".encode.list, 0) 08:48
<simon_sibl> if str which is supposed to be C's str isnt a null terminated string then I dont know what it is 😆
<simon_sibl> and the whole need to use TWEAK when using CStruct I am not sure to understand as well 08:50
lizmat native str is *NOT* a C string 08:56
it's basically the string type that the VM understands, before it is getting wrapped in the Str class HLL construct 08:57
which makes it a true object
disbot6 <simon_sibl> I see, so to instantiate a native class which needs a null terminated string, how can I do ? I only could make it work with CArray[uint8] but in the doc I often see Str, but not sure to understand the whole TWEAK and := thing 08:59
lizmat := is binding, which at the lowest level is the only thing NQP and the VM understand 09:00
when you say:
my $a
my$a = 42
you're creating a Scalar object that binds to lexpad with name "$a", and binds the value 42 to its $!value attribute 09:01
when you say:
my $a := 42
you're binding the value 42 to the lexpad with name "$a"
disbot6 <simon_sibl> okay...(still not sure xD) why is it required for CStruct ? 09:04
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lizmat because C doesn't understand Raku's objects, which what it would be if you assigned to it 09:12
?
disbot6 <simon_sibl> I mean let's say this happens in a Cstruct my Str $s = "foo" I would expect it to be a char* but here is asks me to do some magic with TWEAK or something, let me try to share a simple code I would expect to work but somehow it doesnt 09:16
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disbot6 <simon_sibl> pastecode.dev/s/x6mq4ty5 09:18
<simon_sibl> I added some comments trying to explain my mind
<simon_sibl> no issue with the age field of the string, but the name is a big issue 09:19
lizmat I'm not NativeCall expert, but what happens if you change Str to str in "has Str $.name" 09:21
perhaps the "is repr" logic takes care of that, but maybe not
but really, someone more knowledgeable about NativeCall should give you an answer 09:22
nine or patrickb on #raku might be of help
disbot6 <simon_sibl> this one compiles: pastecode.dev/s/95zdcaeh, but the result is messed up Hello ! Hi Simon ! R: Hiii Simon, you are 22 ! Z: Hiii , you are 22 ! Z: Hiii Tb, you are 23 ! 09:24
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disbot6 <nahita3882> can you share the C code also 10:02
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disbot6 <simon_sibl> its Zig but sure ! (does the IRC bot handles well all the newines ?) zig const std = @import("std"); const print = std.debug.print; const ally = std.heap.page_allocator; const Human = extern struct { name: [*:0]const u8, age: u8, }; export fn zhuman_init(name: [*:0]const u8, age: u8) callconv(.C) *Human { const h = ally.create(Human) catch @panic("init"); h.* = .{.name = name, .age = age}; return 10:09
h; } export fn zhuman_deinit(h: *const Human) callconv(.C) void { ally.destroy(h); } export fn zhuman_greet(h: *const Human) callconv(.C) void { print("Z: Hiii {s}, you are {d} !\n", .{h.name, h.age}); } export fn greet(name: [*:0]const u8) callconv(.C) void { print("Hi {s} !\n", .{name}); } export fn zhuman_test() void { const h = zhuman_init("Jean", 43); zhuman_greet(h); zhuman_deinit(h); }
<nahita3882> Zig I don't know then sorry 10:10
<nahita3882> no IRC side doesn't handle newlines well
<nahita3882> and also when they said the #raku channel they meant on the IRC side, i.e., #raku-irc of here
<simon_sibl> ooooh okok xD thanks ! 🙏
<nahita3882> #raku here serves i don't know what purpose
lizmat well, for beginners... but simon_sibl 's questions clearly are no longer beginner questions :-) 10:12
disbot6 <simon_sibl> I found the first issue 10:20
<simon_sibl> is it possible that explicitly-manage isnt doing its job ? 10:21
<simon_sibl> instead I simply dupethe string in the Zig code and now it works
<simon_sibl> so I guess Raku was freeing even tho I told it not to with explicitly-manage
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disbot6 <simon_sibl> I sent in #raku-irc , hopefully I will understand xD 10:38
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disbot6 <jubilatious1_98524> {$^a+$^b}? 14:18
<simon_sibl> oh I means {$^a+$^a} because I was wondering why *+* would take the last 2 elements to calculate the next one (why the * doesnt refer to the same element) 14:21
SmokeMachine Each * you use mean a different argument… 14:43
m: my &a = * + *; say a 1, 2 14:44
camelia 3
SmokeMachine m: my &a = *+*+*; say a 1, 2, 3 14:45
camelia 6
SmokeMachine m: my &a = *+*; say &a.signature 14:46
camelia (;; $whatevercode_arg_1 is raw, $whatevercode_arg_2 is raw)
SmokeMachine simon_sibl: 👆 14:47
disbot6 <simon_sibl> I see thank you 🙏 14:49
<simon_sibl> I am a bit confused with the Array/Seq/List
<antononcube> many are... 14:50
lizmat Array and List *can* be lazy, Seq is always lazy
disbot6 <simon_sibl> first one work, but why second one I need to use .List when I use dd the diff is the first one is ((...) (...)) while second is [(...) (...)] and for some reason when its the second one, the .&zip is messed up say "part1: ", lines>>.words.&zip.map(&sort).&[Z-]>>.abs.sum; say "part1: ", @lines.List>>.words.&zip.map(&sort).&[Z-]>>.abs.sum; 14:51
lizmat
.oO( I wonder how this looks on the Discord side )
 14:52
disbot6 <antononcube> looks great.
lizmat not so much on the IRC side: very hard to read 14:53
disbot6 <antononcube> figured...
<simon_sibl> pastes.io/foo-62804 14:57
<simon_sibl> better ? xD
lizmat yes 14:58
so how does @lines get filled ?
disbot6 <simon_sibl> from stdin, from advent of code 2024, day 1 15:00
lizmat ? 15:02
15:15 disbot6 is now known as disbot
disbot <simon_sibl> lines contains each line of the input, reading the file line by line 15:27
<simon_sibl> @lines*
<simon_sibl> my @lines = lines 15:28
<simon_sibl> my main question is why [(3, 4), (4, 3), (6 ,8)].&zip different than ((3, 4), (4, 3), (6 ,8)).&zip 15:31
<simon_sibl> m: ((3, 4), (4, 3), (6 ,8)).&zip.say
<Raku eval> ((3 4 6) (4 3 8))
<simon_sibl> m: [(3, 4), (4, 3), (6 ,8)].&zip.say
<Raku eval> (((3 4) (4 3) (6 8)))
<nahita3882> because Array puts its elements into containers, they are itemized, they are Scalars, single things; so when iterated, they yield 1 thing instead of N things they truly are composed of 16:04
<nahita3882> m: [(3, 4), (4, 3), (6 ,8)].[0].raku.say
<Raku eval> $(3, 4)
<nahita3882> m: ((3, 4), (4, 3), (6 ,8)).[0].raku.say
<Raku eval> (3, 4)
<nahita3882> see the $?
<nahita3882> m: .say for $(3, 4) 16:05
<Raku eval> (3 4)
<nahita3882> m: .say for (3, 4)
<Raku eval> 3 4
<nahita3882> there are some ways to decontainerize the elements, that's what I was rambling about the other day 16:06
<nahita3882> e.g.,
<nahita3882> m: [(3, 4), (4, 3), (6 ,8)].map(*.self).&zip.say 16:07
<Raku eval> ((3 4 6) (4 3 8))
<nahita3882> this distinction between arrays and lists this way is bad I think but what do i know
<simon_sibl> aaah okay I see I see, I get it know 🙏 16:13
<simon_sibl> thank you so much
<librasteve> m: say <a b c d>.grep: 'c', :k 16:32
<Raku eval> (2)
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disbot <simon_sibl> the more I use it, the more I prefer it over Perl on my side, except Perl being (more) ubiquitous, no reason not to use Raku for my job (other downside would be performance, but so far I never had a project that required to squeeze seconds of runtime) 17:13
<antononcube> Performance of Raku is the major impairment in my machine learning applications of it. 17:37
<antononcube> Still, it can be used..
<librasteve> crag-of-the-day ?^<TNT energy in J/kg> 22:22
<librasteve> 4184000J/kg 22:24
<librasteve> sure, on performance, raku is not as fast as eg Python numpy since we do not have these optimized libraries (yet) - I have not yet found a situtation where raku compile or execution speed is an issue (usually speed of writing / fixing code is my bottleneck) 22:33
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