Run results for: getOwnPropertyNames vs Object.keys

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser: Chrome 136

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

for ... in

53.3M/s

getOwnPropertyNames

41.4M/s

View exact numbers

Test name	Executions per second
✓ for ... in	53,266,208 Ops/sec
getOwnPropertyNames	41,442,344 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++; }