MeasureThat.net

Run results for: delete property of object vs create new object

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Run details:
Mozilla/5.0 (X11; Linux x86_64; rv:120.0) Gecko/20100101 Firefox/120.0
Firefox 120
Linux
Desktop
one year ago
Test name Executions per second
create new object 5963.0 Ops/sec
directly delete 7104.5 Ops/sec
Script Preparation code:
AخA
 
var obj = {}
for (let i = 0; i < 1000; i++) {
    obj[`test_${i}`] = `value_${i}`;
}
Tests:

  • create new object

     
    const newObject = Object.keys(obj).reduce((object, key) => {
      if (key) {
        object[key] = obj[key]
      }
      return object
    }, {})

  • directly delete

     
    const newObject = { ...obj };
    Object.keys(newObject).forEach(key => {
       delete newObject[key];
    });