Bit late, I'm afraid, but this seems to do what you want:
use strict;
use warnings;
my @array1 = qw ( ant bee ant cow ant dog );
my @array2 = qw ( ant cat bee cow rat );
my @array3 = qw ( ant 1 3 5 7 9 1 2 3 4 5 6 7 8 9 X );
my @arrays;
my $length = 0;
for ( \@array1, \@array2, \@array3 ) {
$length = @$_ if @$_ > $length;
push @arrays, $_;
}
my %seen;
foreach my $i ( 0 .. $length - 1 ) {
for ( @arrays ) {
print "$_->[$i] " if $_->[$i] and not $seen{$_->[$i]}++;
}
}
Output: ant bee cat 1 3 cow 5 rat 7 dog 9 2 4 6 8 X
Maybe there's a way of avoiding two loops, though?
dave
Update: Single loop: my @arrays = \( @array1, @array2, @array3 );
my %seen;
my $i = 0;
{
my $count = 0;
for ( @arrays ) {
++$count and next unless $_->[$i];
print "$_->[$i] " unless $seen{$_->[$i]}++;
}
$i++;
redo unless $count >= @arrays;
}
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