Re^2: Next from inner loop only works "most of the time"

I don't think the multiple usage of $_ is problematic here. According to perlsyn the global $_ gets localized in a foreach loop. Indeed:

#!/usr/bin/perl

use v5.16;
use warnings;

foreach (1, 2) {
    say for qw(a b);
    say;
    foreach (10, 20) {
        say;
    }
    say;
}

__DATA__
a
b
1
10
20
1
a
b
2
10
20
2
[download]

Greetings,
-jo

$gryYup$d0ylprbpriprrYpkJl2xyl~rzg??P~5lp2hyl0p$

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Re^3: Next from inner loop only works "most of the time" by tobyink (Canon) on May 18, 2021 at 19:07 UTC
I don't think it's technically problematic, but it's bad for readability and probably for maintainability. Hire me at Toby Ink Ltd or Join my OnlyFans	[reply]
Re^4: Next from inner loop only works "most of the time" by GrandFather (Saint) on May 18, 2021 at 22:01 UTC
I completely agree except I'd go slight further and suggest that anything that is bad for readability is, perforce, bad for maintainability - if you can't read it you can't maintain it (although you may be able to completely replace it). Optimising for fewest key strokes only makes sense transmitting to Pluto or beyond	[reply]
Re^3: Next from inner loop only works "most of the time" by Anonymous Monk on May 18, 2021 at 23:52 UTC
Nonetheless, `"for(each) my $var ..."` is what's recommended, and with very good reason. For one thing, inner loops (or the code which they contain) usually needs to be able to refer separately to the loop-indexes of one or more of the outer loops. This achieves that without polluting the namespace.	[reply]