Run results for: for-in vs object.keys

Run details:

User agent: Mozilla/5.0 (Linux; Android 13; SAMSUNG SM-S901N/KSU3CWGI) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/23.0 Chrome/115.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 115

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Object.keys

1/s

for-in

1/s

View exact numbers

Test name	Executions per second
✓ Object.keys	1 Ops/sec
for-in	1 Ops/sec

Script Preparation code:

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

Tests:

for-in
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)); }