MeasureThat.net

Run results for: JavaScript spread operator vs Object.assign performance without mutating original object

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:80.0) Gecko/20100101 Firefox/80.0
Firefox 80
Windows
Desktop
4 years ago
Test name Executions per second
Using the spread operator 4251873.0 Ops/sec
Using Object.assign 4115386.5 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);