"So in general, is it not possible to do a multi-array assignment in a single line, i.e.: (@a, @b) = <some_expression>"
That's correct with the syntax you're using there; however, you can do it with references.
Here's a rather contrived example to demonstrate.
#!/usr/bin/env perl -l
use strict;
use warnings;
my ($letters, $digits) = get_arrays();
print "Letters REF: $letters";
print "Letters: @$letters";
print for @$letters;
print "Digits REF: $digits";
print "Digits: @$digits";
print for @$digits;
sub get_arrays {
my @three_letters = qw{A B C};
my @three_digits = qw{1 2 3};
return (\@three_letters, \@three_digits);
}
Output:
Letters REF: ARRAY(0x7ff684047ad0)
Letters: A B C
A
B
C
Digits REF: ARRAY(0x7ff684047938)
Digits: 1 2 3
1
2
3
If you're unfamiliar with references, a good place to start is "perlreftut - Mark's very short tutorial about references".
In the "The Rest" section, you'll find links to more detailed documentation on this topic.
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