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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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| disbot | <simon_sibl> [True, True, True, False].&{[==] @$_} this works | 06:12 | |
| <simon_sibl> [True, True, True, False].&[==] this doesnt work | |||
| <simon_sibl> but I dont understand why | |||
| <simon_sibl> trying to do Day2 of AOC 2024, came up with this which work | 06:18 | ||
| <simon_sibl> say "part1: ", $lines>>.words>>.Int.grep({ ([<] @$_ or [>] @$_) and @$_.rotor(2 => -1)>>.map(1 <= (* - *).abs <= 3).&{ [==] @$_.flat } }).elems | |||
| <simon_sibl> but still a bit confused sometimes how List/Array get passed between . and >> | |||
| <simon_sibl> for $lines { m:g/mul '(' (\d+) ',' (\d+) ')' {$part1 += $0*$1}/; .sink for $/[] }; why in this situation, if I dont go over $/[] it wont process all of the matches ? | 08:34 | ||
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| habere-et-disper | What does the adverb :o do ? It appears to be an undocumented quoting construct ? | 09:42 | |
| lizmat | that's in the new Raku grammar, right ? | 09:47 | |
| habere-et-disper | Attempting translation and noticed it in say github.com/Raku-L10N/NL/blob/main/NL.l10n | 09:48 | |
| lizmat | aah,... ok | ||
| well, it's in the new Raku grammar, and it's only active with "use v6.e.PREVIEW | |||
| habere-et-disper | Okay -- I was expecting to see it mentioned under quoting constructs at docs.raku.org/language/quoting | 09:49 | |
| lizmat | what it does, is that a string like "q:o/%2s/" creates a Format object | ||
| I guess it should be documented there | |||
| docs.raku.org/type/Format | 09:50 | ||
| it's a way to speedup printf | |||
| which is slow, because every time you run a printf, ir runs a grammar and its actions | 09:51 | ||
| habere-et-disper | So the long form is :format ? | ||
| lizmat | indeed | ||
| habere-et-disper | =b | ||
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| disbot | <simon_sibl> is it possible to make a block with is nodal ? or any trait actually | 11:56 | |
| lizmat | looking at the candidates of &trait_mod:<is> only Routine:D is acceptable as an argument for :nodal | 11:59 | |
| m: sub a($,$) { }; trait_mod:<is>(&a,:nodal); dd &a.nodal | |||
| camelia | Bool::True | ||
| lizmat | m: my $a = * + *; trait_mod:<is>($a,:nodal) | 12:00 | |
| camelia | Cannot resolve caller trait_mod:<is>(WhateverCode:D, :nodal); none of these signatures matches: (Mu:U $child, Mu:U $parent) (Mu:U \child, Mu:U \parent, @subtypes) (Mu:U $child, :DEPRECATED($)!) (Mu:U $type, :rw($)!) (Mu:U… |
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| disbot | <nahita3882> $thing.&op is a sugar for &op($thing). Here, the operation is &[==], which is itself a sugar for &infix:<==>. So you are effectively invoking &infix:<==>([True, ...]). Although undocumented, and it's suspicious that an "infix" operator (i.e., a binary operator) can take 1 argument (or even 0 too actually), we see from the code that it's coded to return True for 0 and 1 argument cases, no matter the argument. | ||
| lizmat | nahita3882 that's to support: | 12:01 | |
| m: dd [+] | |||
| camelia | 0 | ||
| lizmat | and: | ||
| m: dd [+] 42 | |||
| camelia | 42 | ||
| disbot | <nahita3882> Here, on the other and, [==] is now the "reduction metaoperator" in action with it taking the &infix:<==> as its operator; so it will do the reduction as desired (although it has chain-precedence, so it might slurp all arguments, but i think it still shortcircuits) | ||
| <nahita3882> that's equivalent to [==] [True, ...] | 12:02 | ||
| lizmat | m: dd [==]; dd [==] 42 | ||
| camelia | Bool::True Bool::True |
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| disbot | <nahita3882> SO, [==] is used in 2 different meanings in those cases, first one doing something not wanted | ||
| <nahita3882> second one i mean | 12:03 | ||
| <librasteve> doesn't every operator in raku have a "natural" value? (so + is 0, * is 1) | |||
| <nahita3882> not every | 12:04 | ||
| <nahita3882> m: [/] | |||
| <Raku eval> Failed to create container: Failed while sending request: Failed read response: Resource temporarily unavailable (os error 11) | |||
| lizmat | m: dd [/] | ||
| camelia | Failure.new(exception => X::NoZeroArgMeaning.new(name => "infix:</>")) | ||
| disbot | <nahita3882> m: say [+&] | 12:06 | |
| <Raku eval> Failed to create container: Failed while sending request: Failed read response: Resource temporarily unavailable (os error 11) | |||
| <nahita3882> it's -1 | |||
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| disbot | <simon_sibl> I am not sure to understand, why does this exists ? why not making it behave like the [==] list... | 13:58 | |
| lizmat | m: say [+&] | 14:02 | |
| camelia | -1 | ||
| disbot | <antononcube> Reduction is not the same as function application. | 14:03 | |
| <nahita3882> yeah there are two different concepts going on there | 14:49 | ||
| <nahita3882> as for why it exists, well personally i'm glad it exists because being able to write f(x) as x.&f makes it more "fluent" if you will | 14:50 | ||
| <nahita3882> you can chain, also depending on the names of functions, readability might increase too if you have more than 3+ applications in sequence | 14:51 | ||
| <nahita3882> f(g(h(x)) is harder to decipher than x.&h.&g.&f | |||
| <nahita3882> if you are fortunate, x => h() => g() => f() also sometimes works | 14:52 | ||
| <nahita3882> it's ==> not => | |||
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| disbot | <librasteve> yeah i use backticks in Discord for stuff like ==> | 18:05 | |
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