Run results for: Object.assign vs direct assignment multiple properties 2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36

Browser: Chrome 125

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Direct Assignment	62.3 Ops/sec
Object.assign	20.2 Ops/sec

Script Preparation code:

var data = {};

Tests:

Direct Assignment
for(var i = 0; i < 10000; i++) { data[`prop_${i}`] = true; data[`prop_${i}1`] = true; data[`prop_${i}2`] = true; data[`prop_${i}3`] = true; data[`prop_${i}4`] = true; data[`prop_${i}5`] = true; data[`prop_${i}6`] = true; data[`prop_${i}7`] = true; data[`prop_${i}8`] = true; data[`prop_${i}9`] = true; data[`prop_${i}10`] = true; data[`prop_${i}11`] = true; data[`prop_${i}12`] = true; }
Object.assign
for(var i = 0; i < 10000; i++) { Object.assign(data, { [`prop_${i}`]: true, [`prop_${i}1`]: true, [`prop_${i}2`]: true, [`prop_${i}3`]: true, [`prop_${i}4`]: true, [`prop_${i}5`]: true, [`prop_${i}6`]: true, [`prop_${i}7`]: true, [`prop_${i}8`]: true, [`prop_${i}9`]: true, [`prop_${i}10`]: true, [`prop_${i}11`]: true, [`prop_${i}12`]: true }); }