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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=562991" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36
Browser:
Chrome 129
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Benchmark engine:
Benchmark.js
Just instantiate new array
42K/s
Set length to zero
42K/s
Splice
40K/s
Pop all values
22K/s
View exact numbers
Test name
Executions per second
✓
Just instantiate new array
41,741 Ops/sec
Set length to zero
41,646 Ops/sec
Splice
39,804 Ops/sec
Pop all values
21,810 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(); }