BTW, you've got the first idiom wrong. It is:
for (my $i = 0; $i < @array; $i++) { ... }
No, the correct idiom is usually
for my $elt (@array) { ... }
or, in those rare cases where you really do need
an index into the array, it becomes
for my $i (0 .. $#array) { ... }
C-style three-clause for loops have been deemed
unperlish, are deprecated, and have been
removed from the core language in Perl6.
If you really need the ability to manipulate
the loop variable from within the loop,
beyond what next and last provide, then
use a while loop, but in general it's
best to avoid that if possible. (Avoid
using while loops in that way, I mean,
not avoid using them at all.)
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