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pl use strict; use warnings; { package My::Package; use fields qw(one two three); sub new { return fields::new({ one => 1, two =>2, three => 3 }); } } print "This happens first \n"; my My::Package $obj=new My::Package; #my $obj=new My::Package; $obj->{one}=5; # Ok, exists $obj->{four}=4; # Bad key The creation of a new object happens in the call to new My::Package When this is assigned to a typed scalar, we get a syntax error at the last line of the file during compilation If we comment out this line and enable the untyped scalar assignment below it, the error is only detected at run time; we see This happens first appear, and only then does Perl tell us we ve tried to use an invalid key.

The only thing this particular object class does is generate restricted hashes with the keys one, two, and three, so if we need to create many restricted hashes with the same keys, this can be a good way to implement that hash Unfortunately, typing in Perl really is no more than an invitation to the interpreter to do some optimization if possible It won t cause Perl to complain if we assign something different to the scalar, even objects of a different class, but it will catch attempts to use literal invalid keys at compile time..

Now that you have created your first repository, you will need to checkout a working copy for your development.

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encountering a <script> tag. You also learned how to grade your web page s performance using the YSlow 22 rule grading criteria, and Page Speed s criteria. With the tools for measuring how well your web page is performing under your belt, you also learned how to implement performance tweaks on JavaScript and images. The performance tweaks covered were minification of JavaScript using the tools YUI Compressor and Google s Closure Compiler. You learned about the benefits of combining JavaScript files into a single file to reduce resource requests, compared serverside compressions using Gzip, and used the image compression tool Smush.it to compress both an example image as well as the images from CNN s home page to understand how much we reduce the response size using such a tool.

Another way to look at our is to think of it as causing Perl to rewrite accesses to the variable in other packages (in the same file) to include the package prefix before it compiles the code. For instance, we might create a Perl script containing the following four lines: package MyPackage; our $scalar = "value"; package AnotherPackage; print $scalar; When Perl parses this, it sees the lexically scoped variable $scalar and our invisibly rewrites all other references to it in the same file to point to the definition in MyPackage, that is, $MyPackage::scalar. Using our also causes variables to disappear at the end of their lexical scope. Note that this does not mean it removes the package variable from the symbol table. It merely causes access through the unqualified name to disappear. Similarly, if the same variable is redeclared in a different package, the unqualified name is realigned to refer to the new definition. This example demonstrates both scope changes: #!/usr/bin/perl -w use strict; package First; our $scalar = "first"; print $scalar; package Second; print $scalar; our $scalar = "second"; print $scalar; # defines $MyPackage::scalar

# defines $First::scalar # prints $FirstPackage::scalar, produces 'first'

# prints $First::scalar, produces 'first' # prints $Second::scalar, produces 'second'

Using TortoiseSVN, select an empty directory, right-click, and select SVN Checkout from the menu. This will prompt you for the address of the repository for which you can enter the file system URL in HTTP format (for example, file:///c:/projects/test/). At this point you have created a working copy of your test project in a directory of your choice. The working copy should already contain the predefined directories you created above trunk, branches, and tags. Now you can start adding code, images, or other files to the trunk of your working copy.

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