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Run results for: empty an array in JavaScript - splice vs setting length

Based on question on http://stackoverflow.com/questions/1232040/how-do-i-empty-an-array-in-javascript

Go to the benchmark
Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Safari/537.36
Chrome 99
Mac OS X 10.15.7
Desktop
2 years ago
Test name Executions per second
Set length to zero 27817.6 Ops/sec
Splice 25560.3 Ops/sec
Tests:

  • Set length to zero

    ​x
     
    var size = 10000;
    var arr2 = [];
    for (var i = 0; i < size; i++){
      arr2.push(i);
    }
    ​
    arr2.length = 0;

  • Splice

     
    var size = 10000;
    var arr3 = [];
    for (var i = 0; i < size; i++){
      arr3.push(i);
    }
    ​
    arr3.splice(0);