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 totally up to date for Today’s top Idioms!   For years, skilled programmers have depended on potent Perl Programming to find larger how one can remedy issues of Perl. Now, during this long-awaited moment variation, 3 popular Perl programmers collect today’s top idioms, recommendations, and examples: every little thing you must write extra strong, fluent, expressive, and succinct code with Perl.   approximately two times the dimensions of the 1st version, powerful Perl Programming, moment version, bargains every little thing from ideas of thumb to prevent universal pitfalls to the newest knowledge for utilizing Perl modules. You won’t simply examine definitely the right how one can use Perl: You’ll examine why those techniques paintings so good.   New insurance during this variation contains   Reorganized and accelerated fabric spanning twelve years of Perl evolutionEight new chapters on CPAN, databases, distributions, documents and filehandles, construction Perl, trying out, Unicode, and warningsUpdates for Perl 5.12, the newest model of PerlSystematically up-to-date examples reflecting today’s most sensible idioms   You’ll the best way to paintings with strings, numbers, lists, arrays, strictures, namespaces, normal expressions, subroutines, references, distributions, inline code, warnings, Perl::Tidy, info munging, Perl one-liners, and an entire lot extra. each approach is equipped within the related goods layout that helped make the 1st variation so handy and well known.

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Creating a hash with 26 elements keyed “A” through “Z” with values of 1 through 26 is easy: @char_num{ 'A' .. 'Z' } = 1 .. 26; Overlaying all of the matching elements from an existing hash with those from a new one, while also adding any elements that exist only in the new hash, is simple: @old{ keys %new } = values %new; This task can be accomplished more tersely, but also less efficiently: %old = ( %old, %new ); “Subtracting” one hash from another is just a matter of deleting from a hash using a list of keys: delete @name{ keys %invalid }; The preceding one-line statement replaces the more wordy: foreach $key ( keys %invalid ) { delete $name{$key}; } Things to remember ■ ■ ■ Use a slice to select multiple elements from a list, array, or hash.

Things to remember ■ ■ ■ Remember that strings and numbers compare and sort differently. Use the letter comparison operators to compare strings. Use the symbol comparison operators to compare numbers. Item 7. Know which values are false and test them accordingly. Since numeric and string data in Perl have the same scalar type, and since Boolean operations can be applied to any scalar value, Perl’s test for logical truth has to work for both numbers and strings. The basic test is this: 0, '0', undef, and '' (the empty string) are false.

P. Roscoe You don’t want to use the value to decide whether you have gone through each element of the array: while ( defined( my $cat = shift @cats ) ) { # WRONG print "I have a cat named $cat\n"; } Instead, ensure that you go through all of the elements by using foreach, and skip those that aren’t defined: foreach my $cat (@cats) { next unless defined $cat; print "I have a cat named $cat\n"; } If you need to know the last element of the array, don’t look for undef values. The $#cats syntax gives you the last element.

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