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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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| pelevesque | What is the correct was to check if an optional parameter was passed in a Raku sub. sub test (@a?) { # how to check if @a was passed? } | 02:55 | |
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| roguerakudev | you can use defined @a | 04:14 | |
| or use a multi sub, e.g. raku multi test(@a) { # @a was passed } multi test() { # @a was not passed } | 04:15 | ||
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| rcmlz | say @a with @a | 06:05 | |
| say „no“ without @a | 06:06 | ||
| pelevesque | I was trying defined, but couldn't get it to work unless it was a scalar. | 06:55 | |
| I finally ended with this: perl sub d2v (Str $d, $new-map?) is export { state $map = %(< ppp 16 pp 33 p 49 mp 64 mf 80 f 96 ff 112 fff 127 >); $map = $new-map if $new-map.defined; return $map{$d} || Nil } | 06:56 | ||
| Other question: Anyone know why this fails as a type contraint? perl my $rx-note = / <[ABCDEFG]> <[♯♭sf]>? \-? \d+ /; subset Note of Str where * ~~ $rx-note; | 06:58 | ||
| The regex works when used like below, but not when used as above. perl my $rx-note = / <[ABCDEFG]> <[♯♭sf]>? \-? \d+ /; 'G9' ~~ $rx-note ?? say 'Yes' !! say 'No'; 'Ga' ~~ $rx-note ?? say 'Yes' !! say 'No'; | 06:59 | ||
| ab5tract | Does subset Note of Str where $rx-note work? | 07:02 | |
| pelevesque | no | 07:03 | |
| The thing just passed right through | |||
| wait | 07:06 | ||
| I have it working now with my original way... mind is blown... it's late I will go to bed and check again tomorrow. Maybe I had another error. Sorry about that. | |||
| It fails when in a module. | 07:12 | ||
| It works when I use the constant keyword perl my constant $rx-note = / <[ABCDEFG]> <[♯♭sf]>? \-? \d+ /; subset Note of Str where * ~~ $rx-note; | 07:16 | ||
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| librasteve | m: subset Note where * ~~ / <[ABCDEFG]> <[♯♭sf]>? -? \d+ /; sub fn(Note $n) {say $n }; fn 'G9'; fn 'Ga'; | 20:37 | |
| Raku eval | G9 Exit code: 1 Constraint type check failed in binding to parameter '$n'; expected Note but got Str ("Ga") in sub fn at main.raku line 1 in block <unit> at main.raku line 1 | ||
| librasteve | m: subset Note where * ~~ / <[A..G]> <[♯♭sf]>? -? \d+ /; sub fn(Note $n) {say $n }; fn 'G9'; fn 'Ga'; | ||
| Raku eval | G9 Exit code: 1 Constraint type check failed in binding to parameter '$n'; expected Note but got Str ("Ga") in sub fn at main.raku line 1 in block <unit> at main.raku line 1 | ||
| librasteve | m: subset Note where /<[A..G]> <[♯♭sf]>? -? \d+/; sub fn(Note $n) {say $n }; fn 'G9'; fn 'Ga'; | 20:39 | |
| Raku eval | Exit code: 1 ===SORRY!=== Unrecognized regex metacharacter - (must be quoted to match literally) at /home/glot/main.raku:1 ------> subset Note where /<[A..G]> <[♯♭sf]>?⏏ -? \d+/; sub fn(Note $n) {say $n }; fn Unable to parse regex; couldn't find final '/' at /home/glot/main.raku:1 ------> subset Note where /<[A..G]> <[♯♭sf]>? -⏏? \d+/; sub fn(Note $n) {say $n }; fn 'G | ||
| librasteve | m: subset Note where * ~~ / <[A..G]> <[♯♭sf]>? -? \d+ /; sub fn(Note $n) {say $n }; fn 'G9'; fn 'Ga'; | 20:40 | |
| Raku eval | Exit code: 1 ===SORRY!=== Unrecognized regex metacharacter - (must be quoted to match literally) at /home/glot/main.raku:1 ------> set Note where * ~~ / <[A..G]> <[♯♭sf]>?⏏ -? \d+ /; sub fn(Note $n) {say $n }; fn Unable to parse regex; couldn't find final '/' at /home/glot/main.raku:1 ------> t Note where * ~~ / <[A..G]> <[♯♭sf]>? -⏏? \d+ /; sub fn(Note $n) {say $n }; fn ' | ||
| librasteve | please ignore the last two (they work in my repl but not on Discord ;-() | 20:41 | |
| jgaz | The docs say `unit` is acceptable as a decorator if the entire program fits within `MAIN`. But what's the point? What is `unit MAIN` telling the interpreter that `sub MAIN` is not? | 20:59 | |
| errr... `unit sub MAIN` | |||
| ab5tract | The only difference should be one less pair of curly brackets and an indentation level | 21:01 | |
| jgaz | Oh, I see. Gotcha. | 21:02 | |
| Thanks | |||
| ab5tract | Another trade off is that you can’t do multi candidates | 21:03 | |
| (For MAIN) | |||
| But for simple self contained scripts it can be quite nice | 21:04 | ||
| jgaz | Good to know! | 21:11 | |