Run results for: Object iteration for-in vs object.keys

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.4 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 15

Operating system: iOS 15.4.1

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
for-in	121.2 Ops/sec
Object.keys	103.8 Ops/sec

Script Preparation code:

var obj = {};
for (var i = 10000; i > 0; i--) {
    obj[`key ${i}`] = i;
}

Tests: