Hi Monks!
All I am doing here is comparing these two arrays and if an element found on the second arrays match the first, don't duplicate the values. My question is about getting an opinion about the way I am doing this here. I need to make sure that @all_checked will have a value at the end.
Thanks for your opinion and help!. 
@account = qw (1234567 9877654 3233480);
@checked_account = qw(9877654); # this could be empty as well

my @all_checked;

if(@checked_account)
 {

   @all_checked = keys %{ { map { $_, 1} (@account, @checked_account) 
+} };
   print "\nAll Checked=*@all_checked*\n\n";

}else{
    
   @all_checked = @account;
   
   }

   
print "Account is @account -\n\n";
print "Checked_account is:@checked_account -\n\n";
print "All_check is: @all_checked -\n";

[download]

In reply to Comparing arrays and efficiency by Anonymous Monk

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.