delete vs undefined vs null (v48)

Revision 48 of this benchmark created by liene on

Description

The delete operator removes a property entirely. Setting a property to undefined removes the value. Setting a property to null changes the value to the null value.

Technically they are not equivalent, but in practice they are often used to mean the same thing: that a property is unset.

Setup

var o = {
      p: [1, 2, 3]
    };

Test runner

Ready to run.

Testing in
TestOps/sec
delete object.property
 delete o.p[0];
ready
object.property = null
 o.p[0] = null;
ready
object.property = undefined
 o.p[0] = undefined;
ready

Revisions

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