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

By Joseph N. Hall

The vintage consultant to fixing Real-World issues of Perl—Now absolutely up-to-date for Today’s top Idioms!

 

For years, skilled programmers have trusted Effective Perl Programming to realize greater how you can remedy issues of Perl. Now, during this long-awaited moment version, 3 well known Perl programmers collect today’s most sensible idioms, strategies, and examples: every little thing you must write extra robust, fluent, expressive, and succinct code with Perl.

 

Nearly two times the dimensions of the 1st variation, Effective Perl Programming, moment variation, offers every thing from ideas of thumb to prevent universal pitfalls to the most recent knowledge for utilizing Perl modules. You won’t simply research the appropriate how one can use Perl: You’ll research why those ways paintings so well.

 

New assurance during this variation includes

 

  • Reorganized and increased fabric spanning twelve years of Perl evolution
  • Eight new chapters on CPAN, databases, distributions, documents and filehandles, construction Perl, trying out, Unicode, and warnings
  • Updates for Perl 5.12, the most recent model of Perl
  • Systematically up-to-date examples reflecting today’s top idioms

 

You’ll the right way to paintings with strings, numbers, lists, arrays, strictures, namespaces, average expressions, subroutines, references, distributions, inline code, warnings, Perl::Tidy, facts munging, Perl one-liners, and an entire lot extra. each method is geared up within the similar goods structure that helped make the 1st variation so handy and popular.

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Additional info for Effective Perl Programming: Ways to Write Better, More Idiomatic Perl (2nd Edition) (Effective Software Development Series)

Sample text

It also uses the idea of “numish” strings—strings that look like numbers. 010; if ( 123 ~~ '456' ) { ... 0' ~~ 123 ) { ... } # String and number: TRUE if ( 'Mimi' { ... } # String and number: FALSE ~~ 456 ) Otherwise, the smart match will make a string comparison using the eq operator: if ( 'Mimi' ~~ 'Mimi' ) { ... } # String and string: TRUE This can be a little tricky. 0' ~~ '123' ) { ... } # numish and numish: FALSE You need to be careful when you use variables with smart match, since their history in the program matters.

18 ❘ Chapter 1 The Basics of Perl Now that you know not to use sigils to recognize variable types, how do you know what sort of variable you’re looking at? There are three factors to consider: the sigil, the identifier, and possible indexing syntax for arrays or hashes. You can see all three in a single-element access to an array: SIGIL IDENTIFIER INDEX $ name [3] $name[3] The sigil is $, the identifier is name, and the indexing is [3]. You know that the variable is name, and you know that it’s an array variable because that’s the only type that uses [ ] for indexing.

Things to remember ■ ■ ■ Sigils relate to the data, not necessarily the variable type. The $ indicates a single element. The @ indicates a list of elements. Item 5. Know your variable namespaces ❘ 19 Item 5. Know your variable namespaces. There are seven separate kinds of package variables or variable-like elements in Perl: scalar variables, array variables, hash variables, subroutine names, format names, filehandles, and directory handles. Each of these different kinds of package variables has its own namespace.

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