[personal profile] mulhern_at_yocto
My first experiences with Perl were pretty rough. There was a time when Perl was the hot new thing and I decided then that I ought to learn it. I tried, and there were quite a few things that made it a bad experience. First, I had no real experience with similar languages, having been formally instructed in C++ and being in the process of learning Java. Second, I had little experience with Perl's chosen domain, which coincided with the domain of shell scripts. Third, I picked a book which, while highly regarded then and having gone through many editions since, only confused and irritated me.

Later I became more sophisticated, more skilled and more knowledgeable. I learned some programming language theory and discovered that many PL theoreticians viewed Perl as an object lesson in poor programming language design. I experienced Perl pitfalls in my new, sophisticated persona, and with my new PL knowledge realized that the language really was to blame and that it wasn't all my fault. Several times, I found myself debugging severely broken ten line Perl programs written by some of the best programmers I knew. This did not inspire confidence.

Lately, though, I'm feeling better about Perl. I've seen Perl scripts written with considerable discipline and I've encountered a text, "Learning Perl the Hard Way" by Allen B. Downey which told me something useful on the second page. After I'd read one and a half chapters of this book and a bit of "Higher-Order Perl" by Mark Jason Dominus I was able to write a simple script that automatically calculated the recursive CPAN dependencies of a particular script. Of course, I used existing modules from CPAN itself to do the heavy lifting, so the script was only 50 or so lines but it was not a pain at all. Features the script uses are:

  • anonymous and higher-order functions

  • foreach

  • named function arguments

  • constructing and dereferencing references

  • object orientation


and of course I make my variables local, use warnings, and use strict. Not bad for a first.

Do I have a sophisticated, mature understanding of Perl? Not in the least. Do I finally have a bit of traction with the language? I think so.
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mulhern_at_yocto

September 2013

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