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actionscript-3actionscript
George Reith
George Reith

Reputation: 13476

AS3: Best way to include non-specific functions in to class

Say I have the following set up of classes...

Road - extends MovieClip
Car - extends Road
Controller - extends Car

And I want to incorporate some common Mathematical functions in them all to make them faster e.g.(replacing Math classes with some speedy bitwise versions).

What is the best way to incorporate these functions into all of them without writing the functions in the classes or extending from class of the functions. Is importing the class into each the fastest way or is their a better way?

Upvotes: 0

Views: 173

Answers (2)

Plastic Sturgeon
Plastic Sturgeon

Reputation: 12527

You can create a public function that you can import into any class. Some examples in the base language are navigateToURL() and getTimer(). These are just public functions in a package, not classes. So create a public function like so

package nameOfYourPackage{

  public function doSomething(a:arguments):returnType
  {
    // Stuf the function does goes here;
  }
}

then you can import it into any class like so:

import nameOfYourPackage.doSomething;

and then youc an call it anywhere in a class that imports it as:

doSomething(args);

Upvotes: 1

Amy Blankenship
Amy Blankenship

Reputation: 6961

I agree with the comments that your design may needs some work. You can't use a Class in another Class without an import statement that refers to it in some way--even if you're just importing an Interface that the Class implements.

The most flexible way to handle this is to have the functional object be passed in to the object that needs it, rather than having that object create the instance itself. This will allow you to swap out a different implementation when you need to (for instance, you might want to use a mock instance for unit testing, or you might need slightly different functionality optimized for a mobile device).

You can pass in the instance either in the Constructor or use a property (which would allow you the freedom to change out the implementation at runtime).

Upvotes: 1

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