November 2002
Intermediate to advanced
758 pages
19h 45m
English
Content preview from Computer Science & Perl ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Part I. Beginner Concepts
In this first section, eleven articles teach you some of the corners of Perl that you won’t find in beginner books or tutorials, but are nevertheless critical bits of knowledge.
We start with two articles by Nathan Torkington. One of the first things novices learn is that Perl has three basic data structures: scalars, arrays, and hashes. Scalars are single chunks of data, such as strings or numbers. Arrays are an ordered sequence of scalars, and Nathan’s article, All About Arrays, teaches you how to manipulate them. His second article, Perfect Programming, shows you how to program defensively, demonstrating techniques for identifying mistakes and preventing them from occurring in the first place.
Next, Mark Jason Dominus’s Precedence shows how Perl’s operators “grab” the operands around them—some tightly, some loosely, and some in ways that you were never taught in grade school. After reading his article, you’ll understand exactly when you need parentheses in your expressions. Art Ramos’s The Birth of a One-Liner then shows you why Perl programs sometimes look inscrutable to the untrained eye.
Frossie Economou’s Comparators, Sorting, and Hashes shows how to use hashes (which map strings to values), demonstrating comparators and Perl’s sorting techniques along the way. Nathan Torkington continues his explanation of Perl’s syntax with What Is Truth?
Sean Burke ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.