this one uses map and copes with variable array length: 
print map
{
    "$x:" . ($a[$_] ? $a[$_] : "undef") . " " .
    "$y:" . ($b[$_] ? $b[$_] : "undef") . ";" .
    "\n"
}
(0..($#a < $#b ? $#b : $#a));

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In reply to Re: read 2 array simultaneously by holli
in thread read 2 array simultaneously by dee00zee

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