Run results for: Object.assign vs for...in...

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:129.0) Gecko/20100101 Firefox/129.0

Browser: Firefox 129

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

For in

962K/s

Object.assign

552K/s

View exact numbers

Test name	Executions per second
✓ For in	962,240 Ops/sec
Object.assign	551,550 Ops/sec

Script Preparation code:

var target = {};
var obj = {};

for (var i = 0; i < 100; i++) {
	obj['propp'+i] = ('this is a value ' + i);
}

Tests: