Why the aversion for the temporary variable? 
for my $foo (keys %var) {
    for my $bar (keys %{$var{$_}} {
        # You can access both now.
    }
}

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I do not believe that this is any less efficient than using $_, and it has great advantages in flexibility and clarity.

In reply to Re: variable like $_ by tilly
in thread variable like $_ by perlthirst

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