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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:125.0) Gecko/20100101 Firefox/125.0

Browser: Firefox 125

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Object.assign	509.4 Ops/sec
for-in assign	220.6 Ops/sec

Script Preparation code:

var input = {};
for (let i = 0; i < 100_000; ++i)
{
  input[`prop${i}`] = i;
}

var output = {};

Tests: