Effective Perl Programming 2nd Edition

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Effective Perl Programming: Ways to Write Better, More Idiomatic Perl (2nd Edition)
by Joseph N. Hall  (Author), Joshua A. McAdams  (Author), brian d foy  (Author)


Product Details

• Series: Effective Software Development Series
• Paperback: 504 pages
• Publisher: Addison-Wesley Professional; 2 edition (April 29, 2010)
• Language: English
• ISBN-10: 0321496949
• ISBN-13: 978-0321496942
• Product Dimensions: 7 x 0.6 x 9.1 inches
  

For years, experienced programmers have relied on Effective Perl Programming to discover better ways to solve problems with Perl. Now, in this long-awaited second edition, three renowned Perl programmers bring together today’s best idioms, techniques, and examples: everything you need to write more powerful, fluent, expressive, and succinct code with Perl.

Nearly twice the size of the first edition, Effective Perl Programming, Second Edition, offers everything from rules of thumb to avoid common pitfalls to the latest wisdom for using Perl modules. You won’t just learn the right ways to use Perl: You’ll learn why these approaches work so well.

New coverage in this edition includes

• Reorganized and expanded material spanning twelve years of Perl evolution
• Eight new chapters on CPAN, databases, distributions, files and filehandles, production Perl, testing, Unicode, and warnings
• Updates for Perl 5.12, the latest version of Perl
• Systematically updated examples reflecting today’s best idioms
  

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关键词：Programming Effective Edition Program Effect Software

Find the documentation for Perl and its modules

Perl comes with a lot of documentation—more than you’d ever want to put on paper. 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).

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.

The perldoc reader

The perldoc command searches the Perl tree for Perl modules (.pm) with embedded documentation, documentation-only .pod files (Item 82), and installed Perl programs. The perldoc command formats and displays the documentation it finds. To start, readperldoc’s own documentation:

1. % perldoc perldoc
   
2. PERLDOC(1) User Contributed Perl Documentation
   
3. 
   
4. NAME
   
5.      C<perldoc> - Look up Perl documentation in pod format.
   
6. 
   
7. SYNOPSIS
   
8.      C<perldoc> [-h] [-v] [-t] [-u] [-m] [-l]
   
9. ... etc. ...

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Enable new Perl features when you need them

Starting with Perl 5.10, you must explicitly enable new features. This ensures that the latest release of Perl can be backward compatible while at the same time letting people start new work using all of the latest nifty features.

For instance, Perl 5.10 adds a say built-in that is just like print except that it adds the trailing newline for you. Not only is your string a couple of characters shorter, but you don’t have to double-quote the string just for the newline:

1. say 'Hello!';  # just like print "Hello\n";

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If someone had already created their own say, their program might break if they run it with Perl 5.10 using the now built-in with the same name. Fortunately, Perl doesn’t enable new features by default:

1. % perl5.10.1 say.pl   # doesn't use new features
   
2. 
   
3. String found where operator expected at old_script.pl line 1, near "say "Hello!""
   
4.       (Do you need to predeclare say?)

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If you want the new features, you can enable them with the new -E switch. It’s just like the -e that lets you specify your program text on the command line, but it also brings in the all of the latest features for your version of Perl:

% perl5.10.1 -E say.pl   # use new features up to 5.10.1% perl5.12.0 -E say.pl   # use new features up to 5.12.0

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