I'll take the liberty of answering for ikegami and guess that
    my @b = apply { $_ = uc($_);} @a;
is just a quick example of the use of apply put together to be consistent with the preceding code
    my @b = map { $_ = uc($_); $_ } @a;
which was itself just a quick example put together to demonstrate a particular problem. I'd be very surprised if ikegami suggested it | either for production code.

Give a man a fish:  <%-{-{-{-<

In reply to Re^3: Perl::Critic says don't modify $_ in list functions and other things by AnomalousMonk
in thread Perl::Critic says don't modify $_ in list functions and other things by Lady_Aleena

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