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 (iPhone; CPU iPhone OS 14_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0 Mobile/15E148 Safari/604.1
Mobile Safari 14
iOS 14.1
Mobile
3 years ago
Test name Executions per second
Set length to zero 21963.2 Ops/sec
Splice 15634.9 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);