Run results for: object.keys for loop vs for in

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36

Browser: Chrome 142

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 5 months ago

Test name	Executions per second
for-in	5172.6 Ops/sec
Object.keys() -> for-loop	8839.9 Ops/sec

Script Preparation code:

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

Tests:

for-in
for (let i=10000; i > 0; i--) { const arr = []; for (const key in obj) { arr.push(key); } }
Object.keys() -> for-loop
for (let i=10000; i > 0; i--) { const keys = Object.keys(obj) for (let i=10000; i < keys.length; i--) { arr.push(keys[i]); }; }