Your test is sound, but the answer is probably that it depends what happens when 'assignment fails'. An array in boolean context (is there such a thing in perl?) will evaluate to true if it contains anything at all:

() is false
(undef) is true
(0) is true

[download]

so if it's coming from a sub that explicitly returns 0 or undef on failure, you'll end up with a populated array. The best thing to do is use just return, since return undef is true in list context. I dimly recall that there occasions when return () is dodgy in scalar context, too, but I can't remember what they are :(

hth

In reply to Re: array test question by thpfft
in thread array test question by smackdab

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.