Run details:
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
Mobile Safari 15
iOS 15.4.1
Mobile
2 years ago
Test name Executions per second
for-in 121.2 Ops/sec
Object.keys 103.8 Ops/sec
Script Preparation code:
AخA
 
var obj = {};
for (var i = 10000; i > 0; i--) {
    obj[`key ${i}`] = i;
}
Tests:
  • for-in

     
    for (var key in obj) {
        console.log(obj[key]); 
    }
  • Object.keys

     
    Object.keys(obj).forEach(key => console.log(obj[key]));