Run results for: JavaScript spread operator vs Object.assign performance - nested objects

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser: Chrome 123

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

Test name	Executions per second
✓ Using the spread operator	21,612,154 Ops/sec
Using Object.assign	8,663,908 Ops/sec

Tests:

Using the spread operator
const firstObject = { sampleData: 'Hello world', nestedObj: { property1: 'property1', property2: 'property2', property3: 'property3', property4: 'property4' } } const secondObject = { oreData: 'foo bar', anotherNestedObj: { property1: 'property1', property2: 'property2', property3: 'property3', property4: 'property4' } } const finalObject = { ...firstObject, ...secondObject };
Using Object.assign
const firstObject = { sampleData: 'Hello world', nestedObj: { property1: 'property1', property2: 'property2', property3: 'property3', property4: 'property4' } } const secondObject = { oreData: 'foo bar', anotherNestedObj: { property1: 'property1', property2: 'property2', property3: 'property3', property4: 'property4' } } const finalObject = Object.assign({}, firstObject, secondObject);