MeasureThat.net

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

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 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/113.0
Firefox 113
Windows
Desktop
one year ago
Test name Executions per second
Set length to zero 68086160.0 Ops/sec
Splice 41853332.0 Ops/sec
Script Preparation code:
AخA
 
var size = 10000;
var arr = [];
for (var i = 0; i < size; i++){
  arr.push(i);
}
Tests:

  • Set length to zero

     
    arr.length = 0;

  • Splice

     
    arr.splice(0, arr.length);