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Run results for: JavaScript spread operator vs Object.assign performance without useless assignment

Object.assign first parameter is automatically updated with the following object(s)

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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);