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

Run details:

User agent: Mozilla/5.0 (Linux; Android 7.1.2; FP2 Build/18.09.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Mobile Safari/537.36 OPR/49.2.2361.134358

Browser: Opera Mobile 49

Operating system: Android 7.1.2

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
Using the spread operator	438903.8 Ops/sec
Using Object.assign	535286.4 Ops/sec

Tests:

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

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

Using the spread operator

Using Object.assign