Run results for: JavaScript spread operator vs Object.assign performance test number 99

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36 Edg/114.0.1823.43

Browser: Chrome 114

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Using the spread operator	3059366.5 Ops/sec
Using Object.assign	3482274.0 Ops/sec

Script Preparation code:

var firstObject = { sampleData: 'Hello world' }

​x
 
var firstObject = { sampleData: 'Hello world' }​

Tests:

Using the spread operator
firstObject.moreData = 'foo bar' firstObject = {...firstObject}
firstObject.moreData = 'foo bar'
firstObject = {...firstObject}
Using Object.assign
const finalObject = Object.assign({}, firstObject, { moreData: 'foo bar' });
const finalObject = Object.assign({}, firstObject, { moreData: 'foo bar' });