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 notice larger how you can resolve issues of Perl. Now, during this long-awaited moment variation, 3 well known Perl programmers collect today’s top idioms, ideas, and examples: every little thing you want to write extra robust, fluent, expressive, and succinct code with Perl.
Nearly two times the dimensions of the 1st version, Effective Perl Programming, moment variation, offers every little thing from principles of thumb to prevent universal pitfalls to the most recent knowledge for utilizing Perl modules. You won’t simply examine the precise how one can use Perl: You’ll examine why those methods paintings so well.
New insurance during this version includes
- Reorganized and extended 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 tips on how to paintings with strings, numbers, lists, arrays, strictures, namespaces, general expressions, subroutines, references, distributions, inline code, warnings, Perl::Tidy, information munging, Perl one-liners, and an entire lot extra. each method is equipped within the related goods structure that helped make the 1st version so handy and popular.
Read Online or Download Effective Perl Programming: Ways to Write Better, More Idiomatic Perl (2nd Edition) (Effective Software Development Series) PDF
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Extra info for Effective Perl Programming: Ways to Write Better, More Idiomatic Perl (2nd Edition) (Effective Software Development Series)
Example text
Know which values are false and test them accordingly ❘ 25 } -e syntax OK If you want to use another variable to hold the line you just read, you have to do the defined check yourself: while ( defined( my $line =
9 ]; @list[ reverse 5 .. 9 ] = @list[ 5 .. 9 ]; Slices provide a handy way to swap two elements: @a[ $n, $m ] = @a[ $m, $n ]; @item{ 'old', # swap $a[$m] and $a[$n] 'new' } = @item{ 'new', 'old' }; # swap $item{old} and # $item{new} Use slices to reorder arrays Slices are also used in sorting (Item 22). Given two parallel arrays @uid and @name, this example sorts @name according to the numerical contents of @uid. The sort orders the indices in @name, uses that sorted list as a slice, then assigns the slice back to @name: @name = @name[ sort { $uid[$a] <=> $uid[$b] } 0 ..
Operator, ||, and &&), it is first converted to a string (Item 8). Perl then tests the string result. If the result is the empty string, or a string consisting exactly of the single character '0', the result is false. Otherwise, the result is true. Note that this rule means that undef will evaluate as false, since it always looks like 0 or the empty string to everything except the defined operator. 24 ❘ Chapter 1 The Basics of Perl This generally works very well. If problems arise, it’s probably because you tested a quantity to see if it is false when really you should have tested to see if it is defined: while ( my $file = glob('*') ) { # WRONG do_something($file); } That glob works well almost all of the time.