I used to be a big fan of Perl. It was the first programming language I really liked. I felt like it didn’t get in my way. CPAN was and still is the best collection of open-source libraries ever assembled.
Then I got into Ruby, and was very happy with the way it cleaned up Perl’s syntax but still didn’t get in my way. There aren’t nearly as many Gems as CPAN modules, but it’s a solid foundation.
Recently I went back to Perl for a small project. Aside from the predictable mistakes — I kept trying to put colons before my hash keys to make them like Ruby symbols — I realized how nice Ruby really is. Perl is definitely powerful, but once you get beyond the text munging it was designed for it can get irritating, especially the ass-backwards way it does OOP. And I found myself missing Ruby’s code blocks. Perl has code blocks too, but understanding them takes a whole book.
I also realized why Ruby is fairly unique among semi-mainstream programming languages: unlike Perl, Python, JavaScript, or VB, it is based around a small set of core concepts: objects, methods, and code blocks. They’re used everywhere, even for control structures and fancy meta-programming. This is good, because it reduces the number of concepts one has to think about to use the language and, paradoxically, makes it easier to add new features. Lisp started the same way with its core concepts: S-expressions and macros.
Higher-order Perl programming requires a book in exactly the same way that Scheme programming requires a book.
Perl doesn’t really so much provide an object system as the means with which to build one; currently the one that’s gaining ground for new development is Moose (meta-object orientation syntax entensions)
http://search.cpan.org/dist/Moose/
which provides a full metaprotocol, declarative classes, roles, CLOS-style method-modifiers etc.
Worth having a play with – it’s a whole new way to look at perl OO