Javascript object with array, deleting does it actually remove the item?

Question

Oks..

I have an object:

data.Dealer.car[0]
               [1]
               [2]

If I do this:

alert(data.Dealer.car.length);
delete data.Dealer.car[1];
alert(data.Dealer.car.length);

It gives me the same count each time from the alert, even though the actual array element now doesn't exist?

Any ideas?

Answer 1

JavaScript arrays aren't sparse, if you have a 0 and a 2, then element 1 must exist. Meaning the count is going to be 2.

Answer 2

If you want to remove an item, use the splice method:

alert(data.Dealer.car.length);
data.Dealer.car.splice(1, 1);
alert(data.Dealer.car.length);

But notice that the indices have changed.

Answer 3

Array.shift() would remove the first item from the array and make it shorter. Array.pop() will remove the last item.

Answer 4

I think you're looking for this:

var arr = [0,1,2,3,4];

alert( arr.splice( 2, 1 ) ); // alerts 2, the element you're removing
alert( arr ) // alerts 0,1,3,4  - the remaining elements

here's a MDC reference

Answer 5

Ok.. fixed this now as the array was still allocated.

I needed to basically do:

var newCar = new Array();
for (i = 0 ; i < tblSize -2; i ++)
{
    newCar[i]=data.Dealer.car[i];
}
data.Dealer.car = newCar;