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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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| deoac | What's the advantage to using samewith() instead of the name of the multi sub? | 01:46 | |
| MasterDuke | that's a good question. i believe samewith() bypasses multi-dispatch. so if you just call the sub again with new arguments, you could end up in a new multi, but samewith (i believe) will call the exact multi it's in | 01:49 | |
| obviously you may or may not want that. but samewith gives you the option | 01:50 | ||
| well. ^^^ sounded good. but... | 01:54 | ||
| m: multi sub a(Int $b) { say "got Int $b" }; multi sub a(Str $c) { say "Str $c"; return if $c eq 2; samewith($c.Int) }; a(2); a("2.2") | |||
| camelia | got Int 2 Str 2.2 got Int 2 |
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| deoac | I don't understand "you could end up in a new multi". Could you please give me an example? | 01:58 | |
| MasterDuke | well, what i ran just did. samewith in the Str multi ended up calling the Int multi | 01:59 | |
| i thought it would end up calling the Str multi again and failing because of the wrong type | 02:00 | ||
| oh, but samewith would allow you to use anonymous recursive multis more easily | 02:03 | ||
| deoac | How can you have anonymous multi-dispatch? | 02:06 | |
| MasterDuke | hm. the 'multi' there was a but too much | 02:08 | |
| m: sub (Int $a) { say "Int $a"; return if $a < 1; samewith($a - 1) }(3) | 02:09 | ||
| camelia | Int 3 Int 2 Int 1 Int 0 |
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| MasterDuke | m: sub (Int $a) { say "Int $a"; return if $a < 1; &?BLOCK($a - 1) }(3) | 02:10 | |
| camelia | Int 3 Int 2 Int 1 Int 0 |
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| MasterDuke | m: sub (Int $a) { say "Int $a"; return if $a < 1; &?ROUTINE($a - 1) }(3) | ||
| camelia | Int 3 Int 2 Int 1 Int 0 |
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| MasterDuke | TMTOWTDI | ||
| deoac | Ah, I see now! Thank you. | 02:12 | |
| MasterDuke | np | 02:16 | |
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| lizmat | fwiw, I think samewith was a mistake (and mine) | 08:41 | |
| nemokosch | There are some other languages that support recursion without typing the function name | 08:55 | |
| If really all it does is to trigger a new call for the same function or method, it shouldn't be too bad, right? | 08:56 | ||
| lizmat | It's slightly more involved than that | 08:58 | |
| e.g. in the case of a method, it will need to obtain the invocant | |||
| nemokosch | That makes sense anyway | 08:59 | |
| What I can offer for comfort (actually, probably rather discomfort), is an actual hard mistake instead | 09:00 | ||
| The multi resolution rules are not transparent | |||
| Last time I was messing around in the core to fix that Range bug, at first I managed to rearrange the order of two candidates I didn't even modify | 09:02 | ||
| This should probably never happen for starters but to make it worse, I found nothing about the rules | |||
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