I do see your point (and Johnson's) in that you shouldn't combine grep and sort.

I was writing this code as an example of how you can pass along modified lists without having to create temporary arrays etc. A friend wrote the same in Python (albeit, in a more ugly way, IMO) and I was sure I could emphasise Perl's flexibility by getting the same solution with less code.

I was wondering really, if it was possible to have a regular expression return 'null', in list context, and to have sort somehow not add the null to the sorted list. Does this make sense?

What I'm trying to achieve here, is simply to print out the molecules that have a phosphorus element ('P'), in the order of the number of carbons within the molecule.

In reply to Re^2: Condensing a grep into a sort by seaver
in thread Condensing a grep into a sort by seaver

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.