Run results for: Object.hasOwn Set.prototype.has Object.prototype.hasOwnProperty in

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:133.0) Gecko/20100101 Firefox/133.0

Browser: Firefox 133

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Object.hasOwn	15110.4 Ops/sec
Set.prototype.has	15103.7 Ops/sec
Object.prototype.hasOwnProperty	15376.8 Ops/sec
in	15555.2 Ops/sec

Script Preparation code:

window.myObject = {};
window.mySet = new Set();
for (let i = 1; i < 1001; i++) {
  window.myObject[i] = null;
  window.mySet.add(i);
}

Tests:

Object.hasOwn
for (let i = 1000; i > 0; i--) { Object.hasOwn(window.myObject, i); }
Set.prototype.has
for (let i = 1000; i > 0; i--) { window.mySet.has(i); }
Object.prototype.hasOwnProperty
for (let i = 1000; i > 0; i--) { window.myObject.hasOwnProperty(i); }
in
for (let i = 1000; i > 0; i--) { i in window.myObject; }