Run results for: getOwnPropertyNames vs Object.keys

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36

Browser: Chrome 73

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
getOwnPropertyNames	3170017.8 Ops/sec
for ... in	7081667.5 Ops/sec

Script Preparation code:

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

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

Tests:

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++;
}

 
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++;}

let n = 0;
for (const k in obj) {
  if (k.charAt(0) == '$') continue;
  n++;
}

 
let n = 0;for (const k in obj) {  if (k.charAt(0) == '$') continue;  n++;}