Run results for: for in loop

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36

Browser: Chrome 111

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Script Preparation code:

var obj = {};
for (var i = 0; i < 20; i++) {
    obj[i] = i;
}

Tests:

for in loop
for (var k = 0; k < 1000; k++) { for (var i in obj) { console.log(obj[i]); } }
object keys loop
for (var k = 0; k < 1000; k++) { var keys = Object.keys(obj); for (var key of keys) { console.log(obj[key]); } }
object entries loop
for (var k = 0; k < 1000; k++) { const entries = Object.entries(obj); for (const [key, value] of entries) { console.log(value); } }
getownproperty
for (var k = 0; k < 1000; k++) { const propertyNames = Object.getOwnPropertyNames(obj); for (const propertyName of propertyNames) { console.log(obj[propertyName]); } }