delete vs undefined vs null

JavaScript performance comparison

Revision 9 of this test case created by

Preparation code

<script>
  o = {
   p: 1
  };
  var id = 0

</script>
    

Test runner

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

Java applet disabled.

Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
delete object.property
var i;
for (i = 0; i < 100; i++) {
 delete o;
};
pending…
delete object["property"]
var i;
for (i = 0; i < 100; i++) {
 delete o["p"];
}
pending…
object.property = undefined
var i;
for (i = 0; i < 100; i++) {
 o.p = undefined;
}
pending…
object["property"] = undefined
var i;
for (i = 0; i < 100; i++) {
 o["p"] = undefined;
}
pending…
object.property = null
var i;
for (i = 0; i < 100; i++) {
 o.p = null;
}
pending…
object["property"] = null
var i;
for (i = 0; i < 100; i++) {
 o = null;
}
pending…

Compare results of other browsers

Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL.

0 Comments