By Joseph N. Hall

ISBN-10: 0321496949

ISBN-13: 9780321496942

The vintage advisor to fixing Real-World issues of Perl—Now totally up-to-date for Today’s most sensible Idioms!   For years, skilled programmers have trusted powerful Perl Programming to find larger how one can resolve issues of Perl. Now, during this long-awaited moment version, 3 popular Perl programmers collect today’s most sensible idioms, suggestions, and examples: every little thing you must write extra robust, fluent, expressive, and succinct code with Perl.   approximately two times the dimensions of the 1st variation, potent Perl Programming, moment version, bargains every thing from principles of thumb to prevent universal pitfalls to the most recent knowledge for utilizing Perl modules. You won’t simply examine definitely the right how one can use Perl: You’ll examine why those ways paintings so good.   New assurance during this variation comprises   Reorganized and elevated fabric spanning twelve years of Perl evolutionEight new chapters on CPAN, databases, distributions, documents and filehandles, creation Perl, trying out, Unicode, and warningsUpdates for Perl 5.12, the newest model of PerlSystematically up-to-date examples reflecting today’s top idioms   You’ll how one can paintings with strings, numbers, lists, arrays, strictures, namespaces, typical expressions, subroutines, references, distributions, inline code, warnings, Perl::Tidy, information munging, Perl one-liners, and an entire lot extra. each approach is prepared within the comparable goods structure that helped make the 1st variation so handy and well known.

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Things to remember ■ ■ ■ Each variable type has its own namespace. Different types of variables with the same name don’t affect each other. Variables in different packages can have the same name but not affect each other. Item 6. Know the difference between string and numeric comparisons ❘ 21 Item 6. Know the difference between string and numeric comparisons. Perl has two completely different sets of comparison operators, one for comparing strings and one for comparing numbers. It’s worthwhile to know the difference and to keep them straight, since using the wrong comparison operator can be a source of hard-to-find bugs.

Avoid a slice when you want an element ❘ 39 Unintentionally evaluating an operator in a list context can produce dramatic (and unfortunate) results. A good example is the line-input operator, which assigned to a slice or even assigned in list context causes the entirety of STDIN to be evaluated immediately: @info[0] = ; ( $info[0] ) = ; This reads all the lines from standard input, assigns the first one to element 0 of @info, and ignores the rest! Assigning to @info[0] evaluates in a list context.

You’d use a couple of reams of paper and a lot of toner to print it all. We lost count after the documentation got to be around 2,000 pages (on our virtual printer, so no trees harmed). 9 10 ❘ Chapter 1 The Basics of Perl There is a huge amount of useful information in the documentation files, so it pays to be able to read them, but even more than that, to find information in them. Part of the ability to find what you need is knowledge, and part of it is tools. pod files (Item 82), and installed Perl programs.

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Effective Perl Programming: Ways to Write Better, More Idiomatic Perl by Joseph N. Hall

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