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You should be careful when specifying prototypes, since many of the options imply the context in which the function should return and, therefore, affect some of the function-specific utilities such as wantarray In general, therefore, you should use prototypes only on new functions, rather than retrofitting them to functions you have already written This will prevent the effects of imposing a scalar context on a function that is expecting to return in a list context For example, consider a function with a single argument:

sub printmsg($) { print "Message: ", shift, "\n"; }

Mangling practice Questions At the end of this chapter we re going to list some possible prototyping projects for you But never forget that almost every practice exam question you encounter is probably a great place to start a prototyping project So in a way, in addition to the projects listed in this chapter, this book contains about 260 more prototyping projects, at no extra charge

Calling this function with an argument that returns a single element list wouldn t produce the same results The call

printmsg(@message);

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would actually print a value of 1, since the scalar prototype has imposed that the list argument supplied be converted to a scalar In the case of a list, the scalar value of a list variable is the number of elements in the list Worse, using a function such as split, which uses the context in which it is called to determine where it puts its results, would cause a more serious problem If used as the argument to the prototype function, split would execute in the scalar context, messing up your @_ argument list

The following sections contain a list of coding exercises or prototyping projects We recommend you use them selectively If you know you re weak in certain topics, feel free to jump to that section of the list first If you want to do an overall assessment of your readiness, read through the list and try to honestly evaluate how difficult (or easy) it would be for you to complete the various projects As you work through your coding projects, go out of your way to prove to yourself that you re really getting the results you think you re getting If you can t verify that your code is doing what you think it s doing, then (with a few exceptions like garbage collection) your task isn t done How about reference materials As we mentioned earlier, don t be too Draconian with yourself Try to do the exercises without using reference materials When you DO use reference material, make a note of it Did you just need to check on a method signature, or did you completely forget a class s capabilities Adjust your study plans accordingly Finally, the following list probably doesn t completely cover every topic you might find on the real exam Use this list as a template to create your own coding projects that focus on areas you want to explore more thoroughly

The main principle behind packages in Perl is to protect the name space of one section of code from another, therefore helping to prevent functions and variables from overwriting each other s values Despite what you may have seen up to now, there is no such thing as a global variable all user variables are created within the realms of a package If no package name is specified, then the default package name is main You can change the current package to another by using the package keyword The current package determines what symbol table is consulted when a user makes a function call or accesses a variable The current package name is determined at compile and run time because certain operations, such as dereferencing, require Perl to know what the current package is Any eval blocks are also executed at run time, and the current package will directly affect the symbol table to which the eval block has access

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