Benchmark: JavaScript spread operator vs Object.assign performance v4

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);

Rendered benchmark preparation results:

Previous results

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

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser/OS: Chrome 132 on Windows

Using the spread operator

11.5M/s

Using Object.assign

9.8M/s

View exact numbers

Test name	Executions per second
✓ Using the spread operator	11,493,390 Ops/sec
Using Object.assign	9,754,639 Ops/sec

JavaScript spread operator vs Object.assign performance v4 (version: 1)