Run results for: for let vs Object.keys 2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36

Browser: Chrome 125

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
for let i in	6014.1 Ops/sec
Object.keys (cached)	4783.5 Ops/sec
Object.keys	6167.5 Ops/sec

Script Preparation code:

var myObject = {};
var sum = 0;

for (let i = 0; i < 1000; i++)
    myObject["property_" + Math.random()] = Math.random();

var keys = Object.keys(myObject);

Tests:

for let i in
for (let i in myObject) sum += myObject[i];
Object.keys (cached)
for (let i = 0 ; i < keys.length ; i++) sum += myObject[keys[i]];
Object.keys
const newKeys = Object.keys (myObject); for (let i = 0 ; i < newKeys.length ; i++) sum += myObject[newKeys[i]];

Run results for: for let vs Object.keys 2

for let i in

Object.keys (cached)

Object.keys