MeasureThat.net

Run results for: JavaScript spread operator vs Object.assign performance(New Reference)

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36
Chrome 105
Mac OS X 10.15.7
Desktop
2 years ago
Test name Executions per second
Using the spread operator 3700487.2 Ops/sec
Using Object.assign 5547838.5 Ops/sec
Tests:

  • Using the spread operator

    ​x
     
    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,
    );