Benchmark: JavaScript spread operator vs Object.assign performance123d

Tests:

Using the spread operator
const firstObject = { sampleData: 'Hello world' } const finalObject = { ...firstObject, data: 'foo bar', };
Using set
const firstObject = { sampleData: 'Hello world' } firstObject['data'] = 'foo bar'

Rendered benchmark preparation results:

Previous results

Test case name	Result
Using the spread operator
Using set

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Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:98.0) Gecko/20100101 Firefox/98.0

Browser/OS: Firefox 98 on Mac OS X 10.15

Test name	Executions per second
Using the spread operator	12559820.0 Ops/sec
Using set	93055020.0 Ops/sec

JavaScript spread operator vs Object.assign performance123d (version: 0)