Run results for: JavaScript spread operator vs Object.assign performance with overwite

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36

Browser: Chrome 92

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Using the spread operator	1292995.0 Ops/sec
Using Object.assign	5526657.0 Ops/sec
Using Object.assign with into empty object	4789275.0 Ops/sec

Tests:

Using the spread operator
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar', sampleData: 'baz' } const finalObject = { ...firstObject, ...secondObject };
Using Object.assign
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar', sampleData: 'baz' } const finalObject = Object.assign(firstObject, secondObject);
Using Object.assign with into empty object
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar', sampleData: 'baz' } const finalObject = Object.assign({}, firstObject, secondObject);