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Run results for: JavaScript spread operator vs Object.assign performance immutable

Performance of object spread vs Object.assign when while preserving previous data.

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36
Chrome 77
Mac OS X 10.14.6
Desktop
5 years ago
Test name Executions per second
Using the spread operator 21782528.0 Ops/sec
Using Object.assign 6085571.5 Ops/sec
Using Object.assign no mutation 5183958.5 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 firstObject = { sampleData: 'Hello world' }
    const secondObject = { moreData: 'foo bar' }
    const finalObject = Object.assign(firstObject, secondObject);

  • Using Object.assign no mutation

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