Benchmark: JavaScript spread operator vs Object.assign wrapper performance

Tests:

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

Rendered benchmark preparation results:

Previous results

Test case name	Result
Using the spread operator
Using Object.assign

ⓘ Get performance results from real users on your website with Request Metrics.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36

Browser/OS: Chrome 70 on Mac OS X 10.14.1

Test name	Executions per second
Using the spread operator	4209864.0 Ops/sec
Using Object.assign	2052366.0 Ops/sec

JavaScript spread operator vs Object.assign wrapper performance (version: 0)