RE: [Flashcoders] Array like access to custom class?

[Dan Thomas]

Thanks very much Morten

DannyT
 

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Morten
Barklund Shockwaved
Sent: 20 December 2005 13:15
To: Flashcoders mailing list
Subject: Re: [Flashcoders] Array like access to custom class?

Dan Thomas wrote:
> Can I provide array like access to a custom collection object?
> 
> E.g.
> 
> Class MyClass
> {
>       private var myArray:Array;
>       
>       public function getArray():Array
>       {
>               return this.myArray;
>       }
> }
> 
> [snip]
> 
> How can I change it so I can achieve the same thing but with access to
> the items like this:
> 
> var someClass:MyClass = new MyClass;
> thisItem = someClass[0];

Use __resolve:

class MyClass
{
        private var myArray:Array;
        
        public function __resolve(name:String):Object
        {
                if (!isNaN(name)) {
                        return myArray[Number(name)];
                } else {
                        return false;
                }
        }
}

But it will not "strict type" properly at all, so you lose major 
benefits of using as2 this way. I'd do it:

class MyClass
{
        private var myArray:Array;
        
        public function elem(n:Number):Object
        {
                return myArray[n];
        }
}

And:

var someClass:MyClass = new MyClass;
thisItem = someClass.elem(0);

Then you will get proper validation of argument, parameter and return
types.

-- 
Morten Barklund - Information Architect - Shockwaved
Gothersgade 49, 4th floor - DK-1123 Copenhagen K, Denmark
Phone: +45 7027 2227 - Fax: +45 3369 1174
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