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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 | Is it possible to send a type as an `sub` argument? e.g. `sub foo (:$type=Rat) { ... }` | 15:16 | |
| Rog | deoac: `sub say-type(Mu $obj) { say $type.WHAT }` | 15:32 | |
| Then `say-type Rat` for example | 15:34 | ||
| This uses the fact that Raku has “type objects” which are referred to just by the class name | 15:35 | ||
| MasterDuke | m: sub say-type(::T) { say T }; say-type(Rat) | 15:36 | |
| camelia | (Rat) | ||
| Rog | The type object still has all the methods, just no field values, and some methods may be uncallable because their signature specifies that the object must be defined | 15:37 | |
| Oh nice, even better | |||
| Definite, not defined, rather | |||
| deoac | Thank you. | 15:39 | |
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| Nemokosch | I still don't seem to get this :: | 15:40 | |
| what does it say or do? | |||
| Rog | I didn’t realize you could directly type capture like that without a parameter | ||
| :: is the package separator and if the left hand side is missing it’s special-cased | 15:44 | ||
| The docs refer to is as the “null pseudopackage” | |||
| to it as* | |||
| I’m not sure what a good way to think about it is for type capturing in signatures | 15:50 | ||
| Roughly you can think of it as meaning “in the current scope” but I’m not sure if there’s any deeper reason or intuitive explanation as to why it “captures” in signatures rather than looking up an existing name | 15:54 | ||
| Nemokosch | yeah I don't get it, lol | 15:58 | |
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| masukomi | > The null pseudo-package is the same search list as an ordinary name search. That is, the following are all identical in meaning: | 19:58 | |
| ``` | |||
| $foo | |||
| ::{'$foo'} | |||
| ::<$foo> | |||
| ``` | |||
| We use it in ruby all the time because without it things aren't at top-level scope. Sometimes we need to use it to kind of kick the compiler and say "no really... start at the top level namespace" | |||
| Seems similar in Raku | |||
| <@297037173541175296> | |||
| > The null pseudo-package is the same search list as an ordinary name search. That is, the following are all identical in meaning: | 20:00 | ||
| ``` | |||
| $foo | |||
| ::{'$foo'} | |||
| ::<$foo> | |||
| ``` | |||
| We use it in ruby all the time because without it things aren't necessarily at top-level scope. Sometimes we need to use it to kind of kick the compiler and say "no really... start at the top level namespace" | |||
| Seems similar in Raku | |||
| <@297037173541175296> | |||
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