MeasureThat.net

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

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/118.0
Firefox 118
Mac OS X 10.15
Desktop
one year ago
Test name Executions per second
Set length to zero 18195.1 Ops/sec
Splice 20644.7 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);