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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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| librasteve | @pelevesque - sorry for jacking up the detail level ... next time we should find somewhere more suitable for this kind of discussion | 13:53 | |
| and thanks for a thought provoking question! | |||
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| @gfldex I really like 2 of your last 3 answers (I think finding a Whatever in the wild would be a head scratcher tho') ... based on the fair point that @pelevesque made, I will raise a document issue to include one of these examples. | 14:40 | ||
| here goes ... github.com/Raku/doc/issues/4493 ... feel free to improve | 14:41 | ||
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| pelevesque | @pelevesque Thanks all. | 17:23 | |
| @librasteve: I don't get: constant NaA = Array.new; # Not an Array | 17:31 | ||
| librasteve | Yes - that's right. The constant declarator binds a name to an object. So, in the first case, we get a new Array and bind it to NaA. The key to the mystery is that NaA is a particular Array (ie. it's the Array stored at a particular memory location) which can be checked by going NaA.WHICH... | 17:55 | |
| m: constant NaA = Array.new; say NaA.WHICH; | |||
| Raku eval | Array|5299052779024 | ||
| librasteve | So, now when we test with =:= (the 'Container Identity Comparison Operator)' docs.raku.org/language/operators#infix_=:=, we are checking if the thing inside the sub body is the identical same Array as the default Array which we have named NaA and not any other Array - even an Empty one - that was passed in as an argument. [That's why I loke to hang out with the folks in the raku community ... they | 18:00 | |
| are soooo smart!] | |||
| oh, and using an Array.new (or List.new) for this means that it is the right type if a check is done later | 18:17 | ||
| scullucs | Cool solution. Maybe the name "NaA" is a bit misleading, I'd go for something like "DfltA", YMMV. | 19:33 | |
| pelevesque | Ah, ya, really nice. I agree with @lucs that NaA and NaH as names are a big misleading. Not sure what DfltA is though. | 19:40 | |
| Maybe? constant refA = Array.new # reference Array constant refH = Hash.new # reference Hash | 19:41 | ||
| librasteve | @pelevesque happy to ping pong ideas here on Discord - don't forget to add your thoughts to the docs issue I opened also | 19:42 | |
| scullucs | (Maybe I should have spelled out "DefaultA".) | 19:43 | |
| pelevesque | Ok, I'll think about it more and might add a comment in the docs on github if I come up with a stronger idea. | ||
| librasteve | btw I was thinking: constant NaA = []; # Not an Array constant NaH = {}; # Not an Hash | 19:45 | |
| pelevesque | maybe dummyA? | ||
| The problem I have with NaA is that you are assigning an array to it... It makes my tiny brain go ouch. Like constant NaN = 42; I see what you want to do though. | 19:46 | ||
| librasteve | good point | ||
| pelevesque | Your solution is uber elegant though. I really like it. | 19:51 | |
| Crips and clean. No fluff. | |||
| librasteve | (kudos to @gfldex , not me) | ||
| pelevesque | Electronic spiritual karma point dispatched to @gfldex. Thanks! | 19:52 | |
| librasteve | how about: constant ArrayAt = []; # a specific Array constant HashAt = {}; # a specific Hash | 20:08 | |
| docs.raku.org/type/ObjAt | |||
| pelevesque | Much better. Formally correct. | 21:01 | |
| librasteve | I have edited my docs issue accordingly | ||
| pelevesque | Thanks for doing all this great work. | 21:02 | |
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