Subclassing an AS3 Array: how to get array elements (this[0] does not work)?

Question

If I am a subclass of an Array, how do I access an element?

class ArrayOfFoo extends Array
{
   public function getFooAt(anIndex : int) : Foo
   {
        return this[anIndex] as Foo;   //  <---- looks for an object attribute (named "0", for example)
   }
}

I could wrap an array instead of subclassing it, however lacking a universal IArray interface, that is less than useful for standard and custom functions expecting an Array.

Vectors do not allow subclassing at all, so they won't help.

Thanks

If you're subclassing an Array, you need to set the class to dynamic. — user1385191
– user1385191, Commented Mar 16, 2011 at 18:19
First off, I assume since you're posting this question that your code snippet does not work. Do you get an error? What is the error? Is it a compile time or run time error? Is this Flex specific code? If so, then you can create a collection that implements ICollectionView. help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/mx/… . — JeffryHouser
– JeffryHouser, Commented Mar 16, 2011 at 18:21

taskinoor · Accepted Answer · 2011-03-16 18:57:43Z

6

Unfortunately this is not as straight forward as you think. Check Extending the Array class on Adobe livedocs for the detail method of extending an array.

edited Mar 16, 2011 at 18:57

answered Mar 16, 2011 at 18:51

taskinoor

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