You didn't mention what you want marriage() to do, but it probably doesn't really matter. Here's an example of how you can do it without indices, using List::MoreUtils pairwise function.
It looks a lot like map, except that it takes two arrays, not one, and it aliases each pair of elements as $a and $b instead of $_. Its prototype requires that you pass it two arrays, whereas map is happy to receive a list not specifically held in an array.
Here's some example code where we've set up marriage() to just 'join' the elements together with a single space character binding them. You could easily modify it to return an arrayref, or even do away with it entirely and do all your work inside the pairwise{...} block.
use strict;
use warnings;
use List::MoreUtils qw/pairwise/;
my @rray1 = qw/ boy boymonkey boydog /;
my @rray2 = qw/ girl girlmonkey girldog /;
our( $a, $b );
my @married
= pairwise{ marriage( $a, $b ) } @rray1, @rray2;
print "$_\n" for @married;
sub marriage {
return join ' ', @_;
}
The output will be:
boy girl
boymonkey girlmonkey
boydog girldog
If you have warnings enabled, it's necessary to either say "our( $a, $b );", or no warnings qw/once/; (within the smallest scope possible scope, such as inside of the pairwise{...} block), or some other means of satisfying the "used only once" warning for $a and $b.
While pairwise{} is a convenience, I really don't see any big advantage over this:
my @married = map{ marriage( $rray1[$_], $rray2[$_] ) } 0 .. $#rray1;
That snippet does iterate over the index which some nut may say is bad form, but on the other hand, it eliminates the need to pull in a CPAN module just for one line of sugar. The map{} approach even eliminates the need to worry about the "used only once" warning.
|