Run results for: getOwnPropertyNames vs Object.keys

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:132.0) Gecko/20100101 Firefox/132.0

Browser: Firefox 132

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

for ... in

28.9M/s

getOwnPropertyNames

14.6M/s

View exact numbers

Test name	Executions per second
✓ for ... in	28,934,614 Ops/sec
getOwnPropertyNames	14,567,724 Ops/sec

Script Preparation code:

var obj = {
  $props : ['a','b','c'],
  a:1,
  b:2,
  c:3
}

Tests:

getOwnPropertyNames
const arr = Object.keys(obj); let n = 0; for (let i = 0; i < arr.length; i++) { const k = arr[i]; if (k.charAt(0) == '$') continue; n++; }
for ... in
let n = 0; for (const k in obj) { if (k.charAt(0) == '$') continue; n++; }