O'Reilly book: AS3 essential Question page 29

Hello

I was hoping that someone has read or maybe this book by Moock has called «Essential AS3» I'm stuck on page 29, I want to understand what is happening here.

package zoo {}

Friend class VirtualPet {}

petName internal var = "unnamed pet";

public void VirtualPet (name) {}

this.petName = name;

}

}

}

--------------------------

Maybe it's simple and I'm making it bigger than it is. Please forgive me if I do not mention the correct sentences to the code that I learn.

The "Unnamed pet" value is the value of the variable to petname and I understand that the code creates an instance via the var function. The restructuring next code [shown in the book don't here] they remove actually "="Unnamed pet";" as I assume that this is redundant since they added the code after him thus showing the reader that it is a placeholder for an idea of the past.

The constructor function 'this.petName = name.' is shake me. If the variable is defined in the constructor? And "(name)" in the line of code above is the return value? Or it creates a link between the code and the ' = name: "below?

The line of code "petName internal var ="Unnamed pet";" which is then reduced to "var internal petName;" is it because he is no longer a decisive value and is just a simple local variable needed to help start the constructor function under?

Thanks for any input... I do my best to pass any info in this book do not confuse myself later.

Yes, you have. There are several different flavors of variable. The importance of this is the scope or extent of the structure of code, when this variable is accessed. Variables are only containers of storage.

Variables are defined outside a function so that they can be used in more than just only one function. If you set the variable inside a function, then it will recognize only inside the function. If you give the variable an initial value when you set it, then it has value first. There are times where you want an initial value and when it is not important. For example, if you set a Boolean variable, it is generally important to give an initial value. When you define a variable that will be used as a parameter in a function, it may be less important.

There are only constructor function in a given class. Think of a class as a set of code that performs a single operation. In this example, VirtualPet made a single instance of a pet. VirtualZoo made on an instance of a zoo, which can contain one or more instances of VirtualPet.

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