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| dwinkley | thought id quickly pick up raku as another fp language by doing aoc problems but ive literally been stuck for an hour on day 1 part 2. this is the problematic part of my code: @inp.map({ my $parsed = %replace.pairs.reduce( -> $acc, $pair { $acc.subst($pair.key, $pair.value, :g); }, $_); }); the compiler is saying this: Cannot resolve caller reduce(Seq:D: Block:D, Str:D); none of these | 20:16 | |
| signatures matches: (Any:U: &, *%_ --> Nil) (Any:D: &with, *%_) in block <unit> at main.raku line 19 and i havent been able to find very great documentation on the reduce function for this use case. can anyone help me? | |||
| thanks in advance for the help | 20:17 | ||
| antononcube | Most likely you have to use |$_ . | 20:56 | |
| Actually that ($_) is a string -- make sure $_ is a list. | 20:57 | ||
| dwinkley | so $_.comb? | 21:07 | |
| both of these suggestions still give the same error | 21:08 | ||
| ab5tract | I would first suggest pulling the operations apart, if possible | 21:16 | |
| Also,explicitly naming the argument to map instead of using the topic variable can help clarify things | 21:17 | ||
| It might be easier to help if the full code was shared | 21:20 | ||
| Anyway, the error message is stating that the only signature for reduce is a single callable | 21:23 | ||
| librasteve | @dwinkley could you provide a gist so that we have some context ...? | 21:25 | |
| ab5tract | *%_ is a bit hard to read but that is a default parameter in (almost) all signatures | 21:26 | |
| antononcube | The first suggestion -- using a slip -- works if $_ is a list/array. | 21:39 | |
| So, you have/had to use |$_.comb . | 21:40 | ||
| dwinkley | of course gist.github.com/dwinkley2/ba2f74aa...4c5cea9d99 | ||
| librasteve | tx! | ||
| @dwinkley I am struggling a bit to understand what you are aiming to do - please can you provide an example result maybe? | 21:47 | ||
| dwinkley | I want to execute every predefined 'replace' on $_ | 21:49 | |
| And preferably without mutation | |||
| You can ignore the check_str parts | 21:50 | ||
| librasteve | oh, ok | ||
| i think you need .trans just chacking... | 22:01 | ||
| my %replace2 = %replace.map( { [.key] => [.value] } ); say @inp>>.trans(%replace2); | 22:24 | ||
| this does the job - it seems that .trans needs the key and value of Pairs to be lists to do multicharacter insertions docs.raku.org/routine/trans#(Str)_method_trans | 22:26 | ||
| for @inp -> $inp is rw { for %replace { $inp .= subst( .key, .value ); } say $inp } | 22:56 | ||