This channel is intended for people just starting with the Raku Programming Language ( Logs are available at
Set by lizmat on 8 June 2022.
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jaguart what sig do I need for multi method .gist for :D defined instance or :U Class ? 02:34
ah found it: multi method gist ( Fruit:D: --> Str) { return "I am a $!flavour $!colour $!shape $!name"; } 02:35
or even: multi method gist ( Fruit:D: --> Str:D ) { return "I am a $!flavour $!colour $!shape $!name"; } 02:37
@Nemokosh - my wish is to be able to tweak some of the docs. I'm in the process of working through the instructions... 02:49
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jaguart and TIL: 02:52
Sometimes it's like there is so much at that I need a beginner-index to useful resources 03:03
e.g. because at search, I search for 'Class' I end up at -> looks like I should have been searching for 'object' to find 03:23
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Mason How would one use a tuple as a key to a hash? 05:38
something like `%test{(1, 2)} = "hi"` creates strange results
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jaguart depends - how are you going to look up the value later? 06:20
eg if you want to lookup by the lists values... 06:25
m: my %h = (1,2).join('='),"hi";%h.say
camelia {1=2 => hi}
jaguart if if its a specific lists... 06:28
m: my @a = 1,2,3; my %h = @a.WHICH, "hi"; %h.say
camelia {Array|6442509276640 => hi}
jaguart How do I fix: zef install Documentable ===> Failed to find dependencies: File::Temp:ver<0.0.6> 06:31
when zef search File::Temp cannot find any version 0.0.6 06:32
and zef info File::Temp shows I have v0.0.10 installed? 06:33
and git clone; cd Documentable; zef install . ===> Testing [FAIL]: Documentable:ver<2.0.1>:auth<github:Raku>:api<1> 06:46
the actual error being: Cannot resolve caller render(Pod::Block::Named:D... from Documentable::To::HTML::Wrapper line 109... 06:55
oh - I see this was borked in June and there are no plans to fix 06:58
Which means that instructions at : for tweaking docs is outdated. 07:01
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Nemokosch Pretty sure I installed Documentable since 08:26
By the way, yes... you know, the thing is, Raku/doc still includes the code of the current, oldschool site. In this sense, it's set to be outdated 08:28
A good example of how missing things get escalated 08:29
<@259818303420235786> I was in the same position a year ago but the situation is better now 08:30
m: say (1,2).WHICH; say (1,2).WHICH 08:31
Lists are not value types, they have referential identity 08:32
liz to the rescue: 08:37
this is a very thin wrapper around ValueList that you could also use directly
mostly this just adds a tuple subroutine 08:38
deadmarshal How should I sort in descending order? 09:39
Nemokosch deadmarshal: you forgot to put the ordering function in a block 09:43
deadmarshal thanks 09:44
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mcmillhj If I want to iterate over an Array pairwise but also get the element index what is the best way to do that? `[<a b>].pairs.rotor(2)` gives me the data I want but I am struggling to destructure that when I loop over it: `@knots.pairs.rotor(2) -> ($head, $tail)` "Too few positionals passed to '<anon>'; expected 2 arguments but got 0 in sub-signature" 16:19
m: for <a b>.pairs.rotor(2) -> ($h, $t) { dd [$h, $t]; } 16:21
camelia Too few positionals passed to '<anon>'; expected 2 arguments but got 0 in sub-signature
in block <unit> at <tmp> line 1
mcmillhj figured it out, the parentheses were messing up the unpacking 16:34
m: for <a b>.pairs.rotor(2) -> $h, $t { dd [$h, $t]; }
camelia Too few positionals passed; expected 2 arguments but got 1
in block <unit> at <tmp> line 1
mcmillhj m: for <a b>.pairs.rotor(2).flat -> $h, $t { dd [$h, $t]; }
camelia [0 => "a", 1 => "b"]
mcmillhj also needed `.flat` 16:35
Nemokosch is this what you wanted? 16:48
that's not how I would have read it 😅
mcmillhj It's all of the data that I needed. I am not sure if there is a better way I can do it however. 16:51
Nemokosch Oh gotcha 17:07
I think kv can also work
That generates flat by default
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mcmillhj oooh, okay I'll play around with that 17:10
m: for <a b>.kv.rotor(2) -> $h, $t { dd [$h, $t]; } 17:11
camelia [(0, "a"), (1, "b")]
mcmillhj yep, that looks a bit better
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gfldex m: for <a b>.pairs -> (:key($idx), :value($v)) { dd [$idx, $v]; } 18:05
camelia [0, "a"]
[1, "b"]
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p6steve m: for <a b>.kv.rotor(2) { dd [$^h, $^t] } 22:33
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deoac  my %my-bag = (a => 1, b => 1, c => 2, d => 3).Bag; 23:19
How do I remove the element with the lowest value?  I don't know the keys. 23:20
Yes, I want it removed from the Bag; not just returned.
guifa m: my %my-bag = (a => 1, b => 1, c => 2, d => 3).Bag; %my-bag{%my-bag.sort(*.value).head.key}:delete; say %my-bag 23:22
camelia {a => 1, c => 2, d => 3}
guifa That's non deterministic though, since a and b would have equal values
Nemokosch instead of sort and head, min would do, right? 23:23
guifa does it provide the pair with the minimum value?
Nemokosch if you pass a callback to it... 😉 23:24
guifa TIL
m: my %my-bag = (a => 1, b => 1, c => 2, d => 3).Bag; %my-bag{%my-bag.min(*.value).key}:delete; say %my-bag
camelia {b => 1, c => 2, d => 3}
Nemokosch it would be so cool if all methods that return data from a composite data structure could just take :delete 23:29
guifa Agreed. But I can see where people might want to do some chained calls for that (say, sort(…).head(2) maybe) and I don't think there's a simple way to pull that off with it 23:31
deoac You all are the best - thank you 23:32
Nahita `%my-bag` there is not a Bag BTW, it's a Hash -- RHS makes a Bag allright but assigning that to %-sigiled thing makes LHS of type Hash; even if it was a Bag, couldn't delete from it too, need BagHash 23:33
guifa Nahita good point
my %my-bag is BagHash = (a => 1, b => 1, c => 2, d => 3).Bag; %my-bag{%my-bag.min(*.value).key}:delete; say %my-bag
m: my %my-bag is BagHash = (a => 1, b => 1, c => 2, d => 3).Bag; %my-bag{%my-bag.min(*.value).key}:delete; say %my-bag
camelia BagHash(b c(2) d(3))
Nahita e.g., `my %bh is BagHash = ...; %bh{%bh.minpairs.first.key}:delete`
if you want all minimals gone, `%bh{%bh.minpairs>>.key}:delete` 23:34
Nemokosch the sole fact that the code worked at all proved that it couldn't be a bag
`minpairs` is good, never heard of it 23:37
so apparently .key is nodal?
hm, maybe Pairs in general are nodal for hyper metaop? 🤔 23:38
m: my %my-bag := (a => 1, b => 1, c => 2, d => 3).BagHash; dd %my-bag>>.succ; dd %my-bag.list>>.succ; 23:43
not trivial at all 23:44
jaguart If a class is in a module, how do I get the Metamodel::ModuleHOW from the class? as in I think .WHO returns the package, what returns the module? 23:51
Nemokosch isn't a module a high-level package? 23:56
jaguart yeah - would be nice if .WHO gate you package // module 23:57