Oh, wait, now I understand. The first member of the array is the header! I can see now what you mean by "merge", I imagined something different, which did not happen. I apologize for offending your code. Here is how I would do it. How sexy it is depends on the beholder's perspective: 
#!/usr/bin/perl
use warnings;
use strict;

use Data::Dumper;

my $arr = [[qw/name pos   loc age/],
           [qw/ike  boss  12  44/],
           [qw/mat  slave 22  21/],
           [qw/jill sec   15  32/],];

my $add = [[qw/car dog  age/],
           [qw/a1  grr  3/],
           [qw/s2  miew 7/],];

my $i = 0;
my %headers;
for (@{ $arr->[0] }, @{ $add->[0] }) {
    $headers{$_} = $i unless exists $headers{$_};
    $i++;
}

my $result = [ [ sort { $headers{$a} <=> $headers{$b} } keys %headers 
+] ];

my $new_columns = keys(%headers) - @{ $arr->[0] };
for (1 .. $#{$arr}) {
    push @$result, [ @{ $arr->[$_] }, (q()) x $new_columns ];
}

my @rearranged = map $headers{$_}, @{ $add->[0] };
for my $row (1 .. $#{$add}) {
    my @new = (q()) x keys %headers;
    my $i = 0;
    $new[$_] = $add->[$row][$i++] for @rearranged;
    push $result, [@new];
}
print Dumper $result;

[download]
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^4: Merging two array(refs) by choroba
in thread Merging two array(refs) by kpiti

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.