jsPerf.app is an online JavaScript performance benchmark test runner & jsperf.com mirror. It is a complete rewrite in homage to the once excellent jsperf.com now with hopefully a more modern & maintainable codebase.
jsperf.com URLs are mirrored at the same path, e.g:
https://jsperf.com/negative-modulo/2
Can be accessed at:
https://jsperf.app/negative-modulo/2
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.
var o = {
p: 1
};Ready to run.
| Test | Ops/sec | |
|---|---|---|
| delete object.property | | ready |
| delete object["property"] | | ready |
| object.property = false | | ready |
| object["property"] = false | | ready |
| object.property = null | | ready |
| object.property = undefined | | ready |
| object.property = void 0 | | ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.