Object delete vs. array splice vs. array delete

JavaScript performance comparison

Test case created


Is it faster to remove an item from an array (and thus allow the indices to be renumbered) or delete a property from an object. Also, checking deletion from array, but this does not renumber the indices so may not be preferable.

Preparation code

  var someArr = [4, 5, 6];
  var someObj = {
   a: 4,
   b: 5,
   c: 6

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

Testing in unknown unknown
Test Ops/sec
someArr.splice(1, 1);
Object Delete
delete someObj.b;
Array Delete
delete someArr[1];
Object sub-script Delete
delete someObj['b'];

Compare results of other browsers


You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

1 comment

asnow commented :

It's difficalt to see real difference between browser becase of PC performance difference. So gays try to test in different browsers if you have

Comment form temporarily disabled.

Add a comment