By James Lee
It is a publication for these people who believed that we didn’t have to examine Perl, and now we all know it really is extra ubiquitous than ever. Perl is very versatile and strong, and it isn’t fearful of internet 2.0 or the cloud. initially touted because the duct tape of the web, Perl has on account that advanced right into a multipurpose, multiplatform language current completely far and wide: heavy-duty internet functions, the cloud, structures management, typical language processing, and fiscal engineering. Beginning Perl, 3rd Edition presents useful perception into Perl’s position relating to all of those initiatives and more.
Commencing with a accomplished evaluation of language fundamentals, you’ll research all approximately very important innovations equivalent to Perl’s info varieties and keep watch over move constructs. This fabric units the level for a dialogue of extra advanced themes, equivalent to writing customized services, utilizing typical expressions, and dossier enter and output. subsequent, the publication strikes directly to the complex issues of object-oriented programming, modules, internet programming, and database management with Perl’s strong database interface module, DBI. The examples and code supplied provide you with the entire details you want to begin writing your individual robust scripts to resolve the issues indexed above, and lots of more.
Whether you're a whole amateur or an skilled programmer, Beginning Perl, 3rd Edition bargains an awesome consultant to studying Perl. What you’ll research:
* the best way to use the ability of Perl
* the right way to deal with Perl facts structures
* the right way to construct database purposes whatever the underlying database
* how one can parse advanced data
* easy methods to write industrial-strength object-oriented Perl
* tips on how to commence net programming in Perl
This publication is for programmers of all colours and persuasions who proposal they can do with out Perl. re-examine.
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Extra resources for Beginning Perl (3rd Edition)
By default, a here-document works like a double-quoted string. In order for it to work like a singlequoted string, surround the label in single quotes. This will become important when variable interpolation comes into play, as we’ll see later. Here-documents are typically used to replace multi-line strings (strings that span multiple lines). A perfect example is a menu that is displayed to the user. Consider this relatively hard-to-read code as a bunch of print() statements: print "Enter your selection:\n"; print " 1 - money\n"; 20 CHAPTER 2 ■ SCALARS print " print " print " 2 - show\n"; 3 - get ready\n"; 4 - go cat go\n"; Or as a here–document: print < Pl use warnings; print "Four sevens are ". This instructs Perl to finish the current line and take the prompt to the start of a new one. I will talk more about escape sequences later in this chapter. You may be wondering why use warnings; is so helpful. \n"; The string that you are printing now contains the text $world. As you will see in the next chapter, $world is a variable, and this variable has not been assigned a value. If you attempt to print a variable that has no value, you simply print nothing. pl before exiting your editor.
Beginning Perl (3rd Edition) by James Lee
Pl use warnings; print "Four sevens are ".
This instructs Perl to finish the current line and take the prompt to the start of a new one. I will talk more about escape sequences later in this chapter. You may be wondering why use warnings; is so helpful. \n"; The string that you are printing now contains the text $world. As you will see in the next chapter, $world is a variable, and this variable has not been assigned a value. If you attempt to print a variable that has no value, you simply print nothing. pl before exiting your editor.