Run results for: JavaScript spread operator vs Using assignment

Run details:

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

Browser: Firefox 67

Operating system: Windows 8.1

Device Platform: Desktop

Date tested: 5 years ago

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

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, };