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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36

Browser: Chrome 90

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
for..in	15516975.0 Ops/sec
object.keys	5632714.5 Ops/sec

Script Preparation code:

var testObject = {
  "tagKey": "tagValue"
};

Tests: