You’re right! But at least warnings raises a red flag:

18:38 >perl -Mstrict -wE "foreach (my $RID) { say qq[\$RID = >$RID<]; 
+}"
Use of uninitialized value $RID in concatenation (.) or string at -e l
+ine 1.
$RID = ><

18:43 >

[download]

I wasn’t expecting the loop to be entered at all, and Foreach Loops doesn’t seem to shed much light on the issue. But I’m guessing it’s the difference between a scalar undef and an empty list:

18:45 >perl -Mstrict -wE "foreach (my @RID) { say 'okay'; }"

18:46 >

[download]

Seems the foreach is treating $RID as a list containing one element (with the value undef), as though it were foreach (my @RID = (undef)):.

18:46 >perl -Mstrict -wE "foreach (my @RID = (undef)) { say 'okay'; }"
okay

18:51 >

[download]

Thanks for pointing this out!

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

In reply to Re^3: Putting Hash values into an array by Athanasius
in thread Putting Hash values into an array by Raya4505

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.