Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36 Edg/114.0.1823.43
Chrome 114
Windows
Desktop
one year ago
Test name Executions per second
Using the spread operator 3059366.5 Ops/sec
Using Object.assign 3482274.0 Ops/sec
Script Preparation code:
x
 
var firstObject = { sampleData: 'Hello world' }
Tests:
  • Using the spread operator

     
    firstObject.moreData = 'foo bar'
    firstObject = {...firstObject}
  • Using Object.assign

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