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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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| rcmlz | done | 10:14 | |
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| mcmillhj | What is the best way to map over two elements of an array at the same time (with overlaps)? For example given `[1, 2, 3, 4, 5]` you would produce `(1 2) (2 3) (3 4) (4 5)`. I had been using `@a Z a.tail(* - 1)` but wasn't sure if there a simpler / more concise way to do this? | 21:00 | |
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| mcmillhj | Maybe something with rotor? | 21:02 | |
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| nemokosch | yep | 21:02 | |
| first off, @a Z @a.skip is a direct improvement | |||
| but the OG version would be @a.rotor(2 => -1) | |||
| mcmillhj | shoot, I missed that in the docs. `@a.rotor(2 => -1)` is what I was looking for. | 21:03 | |
| nemokosch | there is a good video about tricks like this, one sec | ||
| www.youtube.com/watch?v=LvFTyvYM-ds | |||
| mcmillhj | oooh, thank you ! | ||
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| mcmillhj | Sorry, another question. Is there a way to apply the reduction meta operator from the right? So if I have an array [1,2,3] I would get 2-3=1, 1-1=0 | 23:03 | |
| oops, 2-3=-1, 1-1 = 2 | 23:05 | ||
| oops, 2-3=-1, 1- -1 = 2 | |||
| nemokosch | the associativity of the operator decides | 23:12 | |
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