Run results for: Object.keys vs for in loop

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 YaBrowser/24.7.0.0 Safari/537.36

Browser: Yandex Browser 24

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
for in loop	1622.8 Ops/sec
Object.keys	1926.9 Ops/sec

Script Preparation code:

var data = {};
for (var i = 0; i < 10000; i++) {
  data[`a${i}`] = i;
}

Tests:

for in loop
let hasKey = false; for (let key in data) { if (key === 'a998') { hasKey = true; } }
Object.keys
const hasKey = Object.keys(data).includes('a998');