Run results for: JavaScript spread operator vs Object.assign with new empty object

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_5_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 [FBAN/FBIOS;FBDV/iPhone8,1;FBMD/iPhone;FBSN/iOS;FBSV/14.5.1;FBSS/2;FBID/phone;FBLC/vi_VN;FBOP/5]

Browser: Mobile Safari 14

Operating system: iOS 14.5.1

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
Using the spread operator	5705926.5 Ops/sec
Using Object.assign	2200301.0 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 with new empty object

Using the spread operator

Using Object.assign