| klebs | @Coke gotcha -- thank you everybody! -- it is all clear to me now 🙂 | 01:20 | |
| how do we write something like this? ```raku | 02:10 | ||
| my @arr = < | |||
| file1 | |||
| file2 | |||
| file3 | |||
| file4 | |||
| >; | |||
| sub get-lines($fname) { | |||
| $fname.IO.lines.elems | |||
| } | |||
| my @counts = @arr>>.get-lines; | |||
| say @counts; | |||
| ``` | |||
| basically, what i mean to do is apply some function as a transformation to each member of the array | |||
| until now, i have been writing a "do for" | 02:12 | ||
| ie,``` | |||
| my @counts = do for @arr { | |||
| get-lines($_) | |||
| }; | |||
| ``` | |||
| i have a feeling there is a shorthand for this -- does anybody know what it is? | 02:13 | ||
| A26F64 | Would `@arr.map({ get-lines($_) });` not be appropriate? | 02:17 | |
| klebs | thanks, it is definitely an upgrade -- there is something in the back of my mind i think i have seen somewhere which is one line, may use >> and does not explicitly need $_ | 02:36 | |
| [Coke] | @arr.map(*.get-lines) | 02:39 | |
| slightly shorter; uses a whatevercode instead of a block. | |||
| afk | |||
| A26F64 | That's very clean but it fails for me as `get-lines` is not a method of Str. `@arr.map(*.IO.lines.elems)` should work (but that's not calling an independent function as requested). | 02:47 | |
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| avuserow | Something like `@arr.>>&get-lines` ? | 03:33 | |
| Something like `@arr>>.&get-lines` ? | 03:34 | ||
| A26F64 | And by which means `@arr.map(*.&get-lines)` also works. | 03:36 | |
| (Though the hyper operators are not strictly equivalent to ordinary `.map` as "all hyper operators are candidates for parallelism".) | 03:44 | ||
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| Morfent | you shouldn't need the `WhateverCode` in this case: `@arr.map(&get-lines)` | 06:45 | |
| klebs | oh nice! thanks everybody for the answers. i'll be able to use bits and pieces of your replies for lots of new code (to be written) 🙂 | 07:35 | |
| !!! i think the syntax i had in the back of my mind used the & | |||
| i think the syntax i had in the back of my mind used the ampersand! that, i think, is the cleanest way | 07:36 | ||
| but the whatever code inside the map is also a great trick i didn't know | |||
| you folks are the best 🙂 | |||
| i love that i can use this syntax with [+] to reduce the array | 07:39 | ||
| ie ``` say [+] @arr>>.&get-lines;``` | |||
| brilliant syntax. raku is the best. | 07:40 | ||
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| lizmat | and yet another Rakudo Weekly hits the Net: rakudoweekly.blog/2021/11/08/2021-...wo-commas/ | 20:04 | |
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| Quibono | Hello. | 21:09 | |
| Is there any information related to how the grammars work | 21:11 | ||
| Ah nvm I found the page for them. | 21:12 | ||