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Run results for:
empty an array in JavaScript?
Based on question on http://stackoverflow.com/questions/1232040/how-do-i-empty-an-array-in-javascript
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<iframe src="https://measurethat.net/Embed?id=607950" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:140.0) Gecko/20100101 Firefox/140.0
Browser:
Firefox 140
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
one year ago
Benchmark engine:
Benchmark.js
Just instantiate new array
36K/s
Splice
28K/s
Set length to zero
26K/s
Pop all values
20K/s
View exact numbers
Test name
Executions per second
✓
Just instantiate new array
35,979 Ops/sec
Splice
28,298 Ops/sec
Set length to zero
26,202 Ops/sec
Pop all values
20,433 Ops/sec
Tests:
Just instantiate new array
var size = 10000; var arr1 = []; for (var i = 0; i < size; i++){ arr1.push(i); } arr1 = [];
Set length to zero
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, arr3.length);
Pop all values
var size = 10000; var arr4 = []; for (var i = 0; i < size; i++){ arr4.push(i); } while(arr4.length > 0){ arr4.pop(); }