Benchmark: JavaScript spread operator vs Using assignment

Tests:

Using the spread operator
const firstObject = { sampleData: 'Hello world', a: 'a', b: 'b', c: 'c' } const secondObject = { moreData: 'foo bar', a: 'a', b: 'b', c: 'c' } const finalObject = { ...firstObject, ...secondObject };
Using assignment
const firstObject = { sampleData: 'Hello world', a: 'a', b: 'b', c: 'c' } const secondObject = { moreData: 'foo bar', a: 'a', b: 'b', c: 'c' } const finalObject = { ...secondObject, a: firstObject.a, };

Rendered benchmark preparation results:

Previous results

Test case name	Result
Using the spread operator
Using assignment

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Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0

Browser/OS: Firefox 67 on Windows 8.1

Test name	Executions per second
Using the spread operator	937125.4 Ops/sec
Using assignment	2063473.0 Ops/sec

JavaScript spread operator vs Using assignment (version: 0)