Download Beginning Perl (3rd Edition) by James Lee PDF

By James Lee

This can be 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 intensely versatile and strong, and it isn’t petrified of internet 2.0 or the cloud. initially touted because the duct tape of the web, Perl has when you consider that developed right into a multipurpose, multiplatform language current totally all over the place: heavy-duty net functions, the cloud, structures management, typical language processing, and monetary engineering. Beginning Perl, 3rd Edition offers worthwhile perception into Perl’s function concerning all of those initiatives and more.

Commencing with a accomplished evaluation of language fundamentals, you’ll examine all approximately vital strategies equivalent to Perl’s information varieties and regulate movement constructs. This fabric units the degree for a dialogue of extra advanced subject matters, reminiscent of writing customized capabilities, utilizing general expressions, and dossier enter and output. subsequent, the publication strikes directly to the complicated subject matters of object-oriented programming, modules, internet programming, and database management with Perl’s robust database interface module, DBI. The examples and code supplied provide you with the entire details you want to begin writing your personal robust scripts to unravel the issues indexed above, and lots of more.

Whether you're a whole beginner or an skilled programmer, Beginning Perl, 3rd Edition deals an incredible consultant to studying Perl. What you’ll research:
* the right way to use the facility of Perl
* the best way to deal with Perl information structures
* find out how to construct database functions whatever the underlying database
* tips on how to parse advanced data
* the way to write industrial-strength object-oriented Perl
* tips on how to begin net programming in Perl

This e-book is for programmers of all colours and persuasions who suggestion they can do with out Perl. reconsider.

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Beginning Perl (3rd Edition)

It is a e-book for these people who believed that we didn’t have to examine Perl, and now we all know it truly is extra ubiquitous than ever. Perl is very versatile and robust, and it isn’t terrified of internet 2. zero or the cloud. initially touted because the duct tape of the web, Perl has considering the fact that developed right into a multipurpose, multiplatform language current totally in all places: heavy-duty net purposes, the cloud, structures management, average language processing, and monetary engineering.

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Unfortunately, like any human language, the programming language may not have a direct equivalent for what you’re trying to say. So, you have to get your meaning across using the parts of the language that are available to you, and this may well mean breaking down your task further. For instance, there’s no way of saying “if the first five lines do not contain any of the following words” in Perl. ” Programming is the art of putting those elements together to get them to do what you want. So much for what you have to do—what does the computer have to do?

Pl Five is more than six? Seven is less than sixteen? 1 Two is equal to two? 1 One is more than one? Six is not equal to seven? 1 $ Let’s have a look at one last pair of comparisons: we can check greater-than-or-equal-to and lessthan-or-equal-to with the >= and <= operators, respectively. pl use warnings; print "Seven is less than or equal to sixteen? ", 7 <= 16, "\n"; print "Two is more than or equal to two? pl Seven is less than or equal to sixteen? 1 Two is more than or equal to two? 1 $ There’s also a special operator that isn’t really a Boolean comparison because it doesn’t give us a true-or-false value; instead it returns 0 if the two are equal, –1 if the right-hand side is bigger, and 1 if the left-hand side is bigger—it is denoted by <=>.

I will talk about many built-in functions and control flow constructs in detail as we progress in our discussion of Perl. It’s a good idea to respect keywords and not give anything else the same name. For example, a little later on you’ll learn that you can create and name a variable, and that calling your variable $print is perfectly allowable. The problem with this is that it leads to confusing and uninformative statements like print $print. It is always a good idea to give a variable a meaningful name, one that relates to its 6 CHAPTER 1 ■ FIRST STEPS IN PERL content in a logical manner.

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