Arrays get the next available index

[Doush.]

I'm just fooling around making an inventory system and I was wondering if there is a way to work out the next available index in an array without pushing the item into the array.

So for instance

var array:Array = new Array();

array[0] = new Object();
array[1] = new Object();
array[3] = new Object();

Nothing is set in array index 2 so that is the id I want to get or if all indexes are filled eg

array[0] = new Object();
array[1] = new Object();
array[2] = new Object();

I will get array index 3?

Is this possible?

[poltuda]

Is this you are talking about?

var array:Array = new Array();

array[0] = new Object();
array[1] = new Object();
array[3] = new Object();

//Nothing is set in array index 2 so that is the id I want to get or if all indexes are filled eg

//array[0] = new Object();
//array[1] = new Object();
//array[2] = new Object();

for(var i=0;i<array.length;i++){
    if(array[i]==undefined){
        trace(i);
        array[i]=new Object();
    }
}
trace(array);

poltuda

[Doush.]

That's perfect. I didn't realise you could check for undefined on empty array values.

Because this is an array that holds inventory instead of splicing items from the array to remove them, should I set it to undefined instead so the array length doesn't change?

Thanks for the reply

[poltuda]

var array:Array = new Array();

array[0] = new Object();
array[1] = new Object();
array[3] = new Object();

//Nothing is set in array index 2 so that is the id I want to get or if all indexes are filled eg

//array[0] = new Object();
//array[1] = new Object();
//array[2] = new Object();

for(var i=0;i<array.length;i++){
    if(array[i]==undefined){
        trace(i);
        array[i]=new Object();
    }
}
trace(array);
trace(array.length);

array[3]=undefined;
trace(array);
trace(array.length);

poltuda