Actually Juerd is right as far as my code goes.. In one of my scripts i have a subroutine which at the end does this: 
sub a_sub {
   my @things;

   . . .

   return ($should_return_stuff) ? @things : ();
}

[download]
In previous version of the code, I overlooked this part and had 'undef' in place of the pair of brackets '()' (for empty array). Since I have to do this conditional in the return statement, I can't simply have a return; statement all by itself (well, i could... but not without having to add an extra line of code). I somehow assumed that returning 'undef' would make things work. Certainly, I'm a new man now.. clean of the indispicable sin of the past *grin*.

Thanks you all for good points/comments. My initial post was in fact meant to dispose the kind of stupidity that other monks (ak'a myself) get into from time to time. Also, I hoped the post could help a rare few monks who could otherwise fall in the same trap that I did... no big issue, though. ;-)

"There is no system but GNU, and Linux is one of its kernels." -- Confession of Faith

In reply to Re: undef'ing @arrays caveat by vladb
in thread undef'ing @arrays caveat by vladb

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.