You have it backwards. It is not recommended because it is not preferred, and not vice versa.

The next question is why it is not preferred. Several reasons:

  1. If a script uses multiple modules that autoexport lots of stuff, it quickly gets hard to figure out where any given function came from. Give users the option to enforce sanity by documenting what came from where.
  2. When independent modules put things into package main, it becomes very easy for private functions in one to conflict with private functions in another. Tracking down and resolving these conflicts grows more complex rapidly as the number of functions and files grows. (With 5 files you only have 1/4 the number of possible lines of conflict as you do with 10.) Putting each file in its own package reduces the damage from such internal conflicts.
  3. It is preferred that you not export every function. Good modularity in procedural code is to have each module have a simple API. A ton of exported functions is a very complex API.
There are more reasons, plenty of them, but those will do for now. If you want the rest, along with plenty of other good advice, I can highly recommend Code Complete. (No, that is not a Perl book. But good programming technique is not Perl-specific.)

Yes, you can do what you ask for. Perl gives you enough rope to hang yourself. But that doesn't mean that you should do it...

UPDATE: I used the word "recommended" where I really meant "preferred".

In reply to Re: Re: Re: Re: Re: Confused about splitting program into multiple files. by tilly
in thread Confused about splitting program into multiple files. by disciple

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.