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Answer: How do I pass more than one array or hash to a subroutine

by vroom (Pope)
on Jan 18, 2000 at 23:10 UTC ( #2148=categorized answer: print w/replies, xml ) Need Help??

Q&A > subroutines > How do I pass more than one array or hash to a subroutine - Answer contributed by vroom

You need to pass these by reference, otherwise Perl will not see each array or hash as distinct.

You can create a reference by simply prefixing a variable with \ like so:

processarrays(\@array1, \@array2); processhashes(\%hash1, \%hash2);
To use them inside of their routines you can do stuff like the following:
$sub processarrays{ my($a1, $a2) = @_; foreach(@$a1){ # dereferences $a1 print $_; } for($i=0; $i<@$a2; $i++){ print $a2->[$i]; #get at a particular index within array } } sub processhashes{ my($h1,$h2)=@_; foreach my $key(keys %$h1){ #derefences $h1; print $h1->{$key}; #lookup based on $key } }

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