Run results for: Object.keys.length vs for in 2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser: Chrome 134

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

for in

114.9M/s

object keys

86.2M/s

View exact numbers

Test name	Executions per second
✓ for in	114,947,104 Ops/sec
object keys	86,167,208 Ops/sec

Script Preparation code:

var testData = {
    toto: 'titi'
};
function testEmptyObject(obj) {
    for (var key in obj) {
        return false;
    }
    return true;
}

Tests:

object keys
Object.keys(testData).length === 0
for in
testEmptyObject(testData)