Run results for: JSON.stringify vs for in

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.106 Safari/537.36

Browser: Chrome 91

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
object keys	2969049.0 Ops/sec
for in	9221651.0 Ops/sec

Script Preparation code:

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

Tests:

object keys
JSON.stringify(testData) === '{}'
for in
testEmptyObject(testData)

Run results for: JSON.stringify vs for in

object keys

for in