BTW, as far as not calling recursive (or otherwise very expensive) functions more then neccessary, if you do this a lot, consider Memoize, which is designed for exactly that. It's not quite as transparent with objects as it is with, say, factorial, but if your code has a lot of redundant calls it's certianly worth the effort.

You might want to read The Perl Hardware Store section on Memoization and Quantitative Analysis of Memoization, both talks by Mark-Jason Dominous, the author of Memoize. (For that matter, his entire site is full of mind-bending perl stuff.)

Update:Memoize, not Memonize, thanks mirod.

Confession: It does an Immortal Body good.

In reply to Re: Faster Perl, Good and Bad News by theorbtwo
in thread Faster Perl, Good and Bad News by abitkin

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.