Benchmark: JavaScript spread operator vs Object.assign performance with overwite

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);

Rendered benchmark preparation results:

Previous results

Test case name	Result
Using the spread operator
Using Object.assign
Using Object.assign with into empty object

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Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0

Browser/OS: Firefox 93 on Windows

Test name	Executions per second
Using the spread operator	8274770.0 Ops/sec
Using Object.assign	18503360.0 Ops/sec
Using Object.assign with into empty object	11464140.0 Ops/sec

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