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Set by lizmat on 6 September 2022.
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antononcube Anyone still around? 🙂 I have an advent post question. 02:14
I am not sure where to make the blog post: to my blog or to "Raku Advent Calendar". 02:17
@lizmat Here is the Markdown file I mentioned / promised: github.com/antononcube/RakuForPred...in-Raku.md . 02:19
@lizmat I know I should make a gist, but I can also make an HTML file instead, right? 02:20
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gdown Sets and hashes don't handle lists/classes as keys at all, is there a good way do it that I'm missing? Stringifying objects works, but feels absolutely horrible 05:17
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hythm I'm trying to understand the purpose of `RUN-MAIN`, the docs says: "It gets a Callable that is the MAIN that should be executed". however, if I provided a new main, I see the default MAIN run as well: 05:53
tellable6 2023-11-26T09:48:45Z #raku <melezhik> hythm: I got you 😉
hythm m: sub new-main () { say "new main"}; RUN-MAIN(&new-main, Nil); sub MAIN() {say "main"} 05:54
camelia new main
main
hythm So my question is what is the purpose of RUN-MAIN, because it looks like I misunderstand its purpose 05:56
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japhb m: my $h := :{ set(3,4) => 12, <a b c> => 42 }; dd $h 06:09
camelia :{Set.new(4,3) => 12, ("a", "b", "c") => 42}
japhb gdown: You just have to specify an object-keyed hash ^^
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izel japhb: try retrieving <a b c>'s value please 06:31
how are we supposed to do that
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gdown m: my @a = 1,2,3; my $b = %{@a => 5} ; say $b{$(1,2,3)} 06:43
camelia 5
gdown izel: I could've sworn I tested it and it didn't work, but it apparently does
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izel why isn't this working then though 06:47
m: my %h{List} = (0, 0) => 3; say %h{$(0, 0)}.raku
camelia Any
izel confusing
i guess i can't write the type List there it makes it bad
gdown That is weird 06:49
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gdown japhb: It also seems that if you set a class as a key, it only can be indexed by the original instance of the class, which doesn't work for what I'm trying to use it for 06:57
:m class T { has $.a }; my $a = T.new(a => 1); my $b = T.new(a => 1); my $c = :{$a => 5}; say $c{$a}; say $c{$b}; dd $c 06:58
err
m: class T { has $.a }; my $a = T.new(a => 1); my $b = T.new(a => 1); my $c = :{$a => 5}; say $c{$a}; say $c{$b}; dd $c
camelia 5
Hash[Mu,Any] $c = $(:{T.new(a => 1) => 5})
(Mu)
gdown stderr got jumbled into the middle of stdout there, but I hope the point is still clear 06:59
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ab5tract grown: it uses WHICH inside, so only the object used as a key to store can be used as a key to retrieve 08:47
I haven’t had coffee yet so ymmv ;) 08:48
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ab5tract gd 10:12
*gdown
You can always use stringification of the object as the key 10:14
Or you can make a custom hash-like class that uses smartmatch. You will need to override ACCEPTS on the key classes because 10:20
The default object smartmatch won’t return true in the example you shared 10:21
lizmat in that light, raku.land/zef:lizmat/Hash::Agnostic might be interesting 10:22
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ab5tract Oh nice! I was going to say, it’s sort of annoying to fully implement a hash “equivalent” class. Looks like lizmat++ already provides all that scaffolding 10:54
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nemokosch It honestly shouldn't come as a surprise that you need a hashable data type to use something as a hash key 11:15
There is nothing Raku-specific about this
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ab5tract I wouldn’t call it unreasonable to expect object hashes to use ACCEPTS instead of WHICH. It’s also not beyond imagination to expect default ACCEPTS to DWIM with objects that have the same attribute values. 11:49
In both cases Raku goes a different way but my own personal assumption on the matter is that these options would have been debated at implementation time. 11:51
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ab5tract Regardless of whether that’s true, Raku’s actually decently tunable around this, enough that the desired behavior is a role and three methods away. 11:56
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lizmat when using ACCEPTS, how would one select the proper "key" without needing to check all keys to see whether ACCEPTed ? 12:08
ab5tract You’d have to do that indeed 12:12
Quite costly, but it might be an appropriate trade off
If you know your objects will be simple, for instance. Or limited in attribute count. 12:13
With a limited set of keys 12:14
I’d probably still go with a deterministic stringification, to be honest. 12:15
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lizmat and that is what .WHICH is supposed to be 12:25
ab5tract Right, but depending on the use case you could use .Str to make a looser but deterministic-for-the-context matching 12:30
Overriding .WHICH to not always resolve to a single object would probably cause problems, right? 12:31
lizmat yes 12:37
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nemokosch I would call it unreasonable to expect object hashes to use ACCEPTS 😛 12:39
I don't think they could be called "hashes" at that point 12:40
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lizmat associative arrays then ? 12:44
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nemokosch maybe buckets 12:56
smartmatch is very very far from an identity relation, it's only sufficient for superficial grouping 12:57
ab5tract It’s clear that an identity relation is not what he is looking for, otherwise the default object behavior would work. 13:11
My point regarding “unreasonable” is that Raku uses ACCEPTS more or less seamlessly in a number of places. So it’s not unfounded. Maybe that would have been a better word choice 13:13
lizmat and yet another Rakudo Weekly News hits the Net: rakudoweekly.blog/2023/12/18/2023-...ore-magic/ 13:39
antononcube @lizmat Is the link to the Markdwon file of my post sufficient? Should I make gist of it? 13:57
@lizmat Here is the link: github.com/antononcube/RakuForPred...in-Raku.md
lizmat yeah, that'll work, thanks! 13:58
[Coke] (associative arrays) Shades of TCL! 14:00
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antononcube Great! 14:04
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nemokosch it probably is an identity relation what he's looking for, just not the one described by === 15:06
lizmat antononcube am a bit confused about the rendering of "basename => raccoons-with-snowballs.png" that feels incorrect ? 15:07
antononcube @lizmat This is a "default output" of the DALL-E magic cell when an export of an image is made. It uses .IO.parts.tail (or something similar.) 15:08
The function image-export is used by the DALL-E meta magic cells in "Jupyter::Chatbook". So, image-export instead of giving a True/False value gives the file path of the exported image, if the export was successful. That is helpful in bigger workflows. 15:11
@lizmat Do you think I should add more explanations in that document? Or it is "too late" now? 15:12
lizmat it's not too late... but please wait until I've done the initial version of the post :-)
antononcube 🙂 Ok. I am not sure what the overall procedure is... 15:13
lizmat antononcube you have a WP login it seems, so I will be able to give you a link with the draft version
antononcube Ok, good. 15:14
The advent instructions say to make a WordPress post -- where that post should have been: 1) my blog or 2) Raku Advent Calendar ?
lizmat Raku Advent Calendar.... and it's ready for your perusal: rakuadventcalendar.wordpress.com/?...eview=true 15:17
antononcube @lizmat Thanks! 15:18
@lizmat Should I make edits in the WordPress document? (The link you provided.) Or just GitHub in my GitHub file? 15:42
lizmat please in the WordPress document :-)
antononcube Ok. 15:44
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Geth advent/main: 1141a0a237 | (Elizabeth Mattijsen)++ (committed using GitHub Web editor) | raku-advent-2023/authors.md
Add Anton Antonov's post
 20:25
lizmat only 2 slots left! 20:26
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antononcube @lizmat I can volunteer for another post. When is the next slot / date? 20:51
lizmat 23/24
antononcube Ok, I am volunteering then -- a post titled "Streamlining AI vision workflows" (with Raku). Or something like that. 20:53
lizmat for the 24th then? 20:55
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Geth advent/main: 1c0e8f3f74 | (Elizabeth Mattijsen)++ (committed using GitHub Web editor) | raku-advent-2023/authors.md
Schedule another Anton Antonov for the 24th!
 20:57
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antononcube @lizmat Yes, 24th is fine. 21:18
lizmat so scheduled :-) 21:19
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