If I understand your question..... 

$param =~ s/'(\d+)'/$1/g;
$param =~ s/NULL/undef/g;
@list_of_params = split /\s*,\s*/, $param;

[download]

Map would be useful if you were already dealing with a list. No point splitting things into a list before you've taken advantage regular expressions to substitute where necessary.

UPDATE: Thanks BrowserUK for the little tip. So as to actually substitute NULL with the undef value (rather than the 'undef' string), I propose this: 

$param =~ s/'(\d+)'/$1/g;
@list_of_params = map { ($_ eq 'NULL') ? undef : $_ }
                  split( /\s*,\s*/, $param );

[download]

Yes, it can be done in a one-liner using two map calls, but I still think that's making it a little too complex (and difficult to maintain in the future).

Dave

"If I had my life to do over again, I'd be a plumber." -- Albert Einstein

In reply to Re: map not returning by davido
in thread map not returning by surag

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.