Run results for: JavaScript Object Mutation vs Object.assign performance

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36

Browser: Chrome 94

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Using Mutation	1262568000.0 Ops/sec
Using Object.assign	5151778.0 Ops/sec

Tests:

Using Mutation
const baseObject = { } baseObject.sampleData = 'Hello world'; baseObject.moreData = 'foo bar'; const resultObject = baseObject;
Using Object.assign
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = Object.assign(firstObject, secondObject);