Run results for: for-in vs object.keys

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser: Chrome 134

Operating system: Windows

Device Platform: Desktop

Date tested: 3 days ago

Test name	Executions per second
for-in	4.4 Ops/sec
Object.keys	4.3 Ops/sec

Script Preparation code:

var obj = {
  'a': 1,
  'b': 1,
  'c': 1,
  'd': 1,
  'e': 1,
  'f': 1,
  'g': 1
};

AخA
 
var obj = {  'a': 1,  'b': 1,  'c': 1,  'd': 1,  'e': 1,  'f': 1,  'g': 1};

Tests:

for (var i=10000; i > 0; i--) {
  for (var key in obj) {
      console.log(key); 
  }
}

 
for (var i=10000; i > 0; i--) {  for (var key in obj) {      console.log(key);   }}

Object.keys
for (var i=10000; i > 0; i--) { Object.keys(obj).forEach(key => console.log(key)); }
for (var i=10000; i > 0; i--) {
Object.keys(obj).forEach(key => console.log(key));
}