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Then , if you want to modify an existing data structure, what about using the fact that modifying $_ will modify the original array? Something like this, shown under the debugger:
DB<1> @a = 1..9; DB<2> map{ $_ = ++$_% 10 } @a; DB<3> x @a 0 2 1 3 2 4 3 5 4 6 5 7 6 8 7 9 8 0 DB<4>
Well, this obviously works, but something like $c = ++$c is, I believe, not defined in C and probably also not in Perl (i.e. the implementor if free to do whatever). It could be changed to:
map { $_ ++; $_ = $_ % 10} @a;
This would probably be more secure against any change of implementation.

In reply to Re^3: A better (ie.more concise) way to write this? by Laurent_R
in thread A better (ie.more concise) way to write this? by BrowserUk

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    [1nickt]: marto would like to hear that. Of course he speaks very deliberately and dramatically, allowing pauses between words, so if anybody could pull it off it would be him, or someone impersonating him ...
    [Eily]: Discipulus that's a chess joke BTW right? Because bishops don't walk straight :D
    [choroba]: stop making chessy jokes about bishops!
    [choroba]: I mean cheesy
    [LanX]: lol
    [ambrus]: no, the chess bishop itself is a joke on real bi-shops
    [ambrus]: or at least on the stereotype of bi-shops
    [choroba]: we call chess bishops "archers"
    [Eily]: choroba sorry, I had to get that off my chess
    [ambrus]: chess certainly hasn't started those stereotypes, like how kings aren't that powerful but has convinced their whole country to work for them, etc. it's just poured them to a nice clean form that would easily get propagated.

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