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Tinkering with Perl
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In school, you may have used variables to refer to different numbers. The variables x could be 3, or 4, or 0, or -9.5. One variable can mean any of several different numbers. (But it can only mean one thing at a time.)
In computer programming, we use variables to represent all sorts of different things. In Perl, there are three different types of variables we will use: scalars, lists, and hashes. The names sound a little funny, but don't let that scare you.
Scalars - Lists - Hashes - Assignment of variables in general
Tinkering with Perl is a free book that provides an introduction to programming in Perl, as well as a basic reference for things like foreach in Perl, if-then, and if-then-else, in addition to providing a glossary where you can find definitions for concatenate and other terms.
Tinkering with Perl may be one of the most popular offerings on this site, but it's not the only attraction. You can read a tongue-in-cheek Game Review: Meatspace, read an even more offbeat customer service survey (whether or not you actually fill it out), and spend a few minutes wishing your boss would read, The Administrator Who Cried, "Important!" (Not to mention that there are other things you can read here besides tech stuff, from Janra Ball: The Headache to The Spectacles.)
Jonathan's Corner
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Tinkering with Perl
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