Hi ! Most dynamic way to do it: 
my $spec = .... ; # H, M , etc...
my $mod = "mod".$spec ; # Modules named modH , modM , etc..

eval "require $mod;";
if( $@ ){
  die "Cannot load module $mod for specie $spec : $@";
}

#Then, use your module function f1 , f2.. by:

$mod->f1() or $mod::f2() etc...

[download]
This way, anytime you have a new specie to handle you just have to write a new module, without modifying your using code.

In general, avoid to construct case like structure. It makes your code hard to maintain and is a bit outdated.

Dynamicity of perl is easy to write and very rewarding to use. Use it !! J.

Nice photos of naked perl sources here !

In reply to Re: use module question. by jeteve
in thread use module question. by Miyah

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.