Benchmark: JavaScript spread operator vs Object.assign performance

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' } function newState(a, b) { return Object.assign({}, a, b); } const finalObject = newState(firstObject, secondObject);

Rendered benchmark preparation results:

Previous results

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

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Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0

Browser/OS: Firefox 60 on Windows

Test name	Executions per second
Using the spread operator	2426057.0 Ops/sec
Using Object.assign	3624066.0 Ops/sec

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