Learn Perl In a Weekend (In a Weekend (Indianapolis, Ind.).) by Thomas Nowers

By Thomas Nowers

Prepare to benefit the preferred programming language of the web! commence your trip into the realm of Perl Friday night as you put in ActivePerl and create an HTML web page. On Saturday, conceal the elemental development blocks of Perl, Perl operators, statements, and expressions. On Sunday, study object-oriented programming and pull your past classes jointly in an entire Perl video game application. Wrap issues up as you contact on complicated Perl subject matters together with safeguard, XML integration, and utilizing Perl with CGI.

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Only a handful of commands in Perl are uppercase. If you have trouble executing a script, and you receive an unrecognized error, you might have accidentally used an uppercase letter in place of a lowercase one. Because Perl has dominion over many of the common lowercase words, you might find that other Perl programmers use uppercase in their code for specific types of important values or scalars because uppercase terms are easy to find when scanning the script. $ is the prefix dereferencer for scalars.

Perl waits at these brackets for user input <> What if you want more than one value in your hash? Well, the normal prefix dereferencer is the percentage sign (%). Assigning a large group for references (for example, a record collection) to a hash works something like this: %album = ( 'II' ' 'LedZeppelin', 'Unforgettable' ' 'Natalie Cole', 'Fundamentals' ' 'DTCFE', 'White Ladder' ' 'David Gray', ); You now have several album names that each reference the artist. This is a simple example where hashes are used.

Unlike other programming languages, such as Java or C, in Perl you do not need to declare variables before you use them. The first time you use a variable in a script, Perl automatically creates and assigns space for it. In many other programs, you need to list many of your variables initially, so the programming language can make sure to set aside space for them. Realize, however, that many programmers consider it poor form to use variables before declaring them. Perl actually provides a special rule set called Strict that forces you to write code so that it is consistent with several standard program conventions, including declaring variables before using them.

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