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#!/usr/bin/perl # persist.pl use warnings; use strict; sub definelexical { my $lexvar = "the original value"; return \$lexvar; # return reference to variable } sub printlexicalref { my $lexvar = ${$_[0]}; # dereference the reference print "The variable still contains $lexvar \n"; } my $ref = definelexical(); printlexicalref($ref); In the subroutine definelexical, the scope of the variable $lexvar ends once the subroutine ends. Since we return a reference to the variable, and because that reference is assigned to the variable $ref, the variable remains in existence, even though it can no longer be accessed as $lexvar. We pass this reference to a second subroutine, printlexicalref, which defines a second, $lexvar, as the value to which the passed reference points. It is important to realize that the two $lexvar variables are entirely different, each existing only in its own scope but both pointing to the same underlying scalar. When executed, this script will print out The variable still contains the original value.

In this particular example, there is little point in returning a reference. Passing the string as a value is Tip simpler and would work just as well. However, complex data structures can also be preserved by returning a reference to them, rather than making a copy as would happen if we returned them as a value.

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The fact that a lexical variable exists so long as a reference to it exists can be extended to include references to references and references to references to references. So long as the top reference is stored somewhere, the lexical variable can be hidden at the bottom of a long chain of references, each one being kept alive by the one above. This is in essence how lexical array of arrays and hashes of hashes work. The component arrays and hashes are kept alive by having their reference stored in the parent array or hash.

As any web developer/designer will tell you, Firebug has saved his or her life more than a handful of times when creating cross browser applications I know it has for me. Firebug is a plug-in widely used by web developers that provides detailed information about a web page s DOM, CSS, JavaScript, and, most importantly for response optimization, resource request information. The plug-in retrieves information about the specific web page you re currently on and presents the information within its different tabs.

necessary for our later discussion of the workflow issues. Those who already know this material can skip to the Committing Your Code and Updating from the Repository: Some Tips section of this article.

The our keyword is a partial replacement for use vars, with improved semantics but not quite the same meaning. It allows us to define package variables with a lexical scope in the same manner as my does. This can be a little tricky to understand, since traditionally lexical and package scope are usually entirely different concepts. To explain, our works like use vars in that it adds a new entry to the symbol table for the current package. However, unlike use vars the variable can be accessed without a package prefix from any package so long as its lexical scope exists. This means that a package variable, declared with our at the top of the file, is accessible throughout the file using its unqualified name even if the package changes.

#!/usr/bin/perl # restrictedhash.pl use strict; use warnings; use Hash::Util qw(lock_keys); %hash1=(one =>'first', two=>'second', three=>'third'); lock_keys(%hash1); # lock hash to pre-existing keys Whereas a pseudohash provided us with a hash with fixed keys and changeable values, restricted hashes also let us lock values, making them read-only, and we can choose to lock and unlock individual values or the whole hash at will. The functions to do this are unlock_keys, lock_value, and unlock_value. Adding these to the use statement and continuing the preceding example, we can lock and unlock individual keys and values with unlock_keys(%hash1); # unlock all keys

my %hash2; lock_keys(%hash2,'one',two','six'); # lock empty hash with the specified keys lock_value(%hash2,'one','two'); unlock_value(%hash2,'two'); # lock the values of keys 'one' and 'two' # unlock the value of key 'two'

Before you can start using SVN, you need to create a repository for your project. Using TortoiseSVN the process is simple: 1. 2. 3. Create an empty directory inside the Projects directory to act as the repository location for your project. Under Windows, right-click on the directory, go to the TortoiseSVN menu, and click Create repository here. TortoiseSVN will ask about the type of repository you want to create. Leave at the default Native Filesystem (FSFS) and click OK.

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