JavaScript Array.length

[centenial]

Hi,

 

Can anyone explain to me the behavior of this code? I don't understand why JavaScript's Array.length property isn't updated after I delete an element from that array.

 

var arr = new Array();
arr[0] = 'test';
alert(arr.length); // 1
delete arr[0];
alert(arr.length);  // should be 0, but javascript returns 1

 

Am I doing something wrong, or is this a JavaScript bug?

 

Thanks!

[abazoskib]

did you check the length of the array after first creating it?

[centenial]

Yes.

 

var arr = new Array();
alert(arr.length); // returns 0

[abazoskib]

i think what is happening is you are just removing the value of the array, but not removing the actual index of the array. try using splice: http://www.w3schools.com/jsref/jsref_splice.asp instead.

[centenial]

i think what is happening is you are just removing the value of the array, but not removing the actual index of the array. try using splice: http://www.w3schools.com/jsref/jsref_splice.asp instead.

 

That's exactly what I was looking for... I knew JavaScript couldn't have had such a bug. Thanks!