Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 11_2_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.192 Safari/537.36
Chrome 88
Mac OS X 11.2.2
Desktop
4 years ago
Test name Executions per second
Using the spread operator 2482476.0 Ops/sec
Using Object.assign 5658880.0 Ops/sec
Tests:
  • Using the spread operator

    AخA
     
    const firstObject = { sampleData: 'Hello world' }
    const secondObject = { moreData: 'foo bar' }
    const finalObject = {
        ...firstObject,
        ...secondObject
    };
  • Using Object.assign

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