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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=621081" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 18_6_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.6 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 18
Operating system:
iOS 18.6.2
Device Platform:
Mobile
Date tested:
10 months ago
Benchmark engine:
Benchmark.js
Set length to zero
40K/s
Just instantiate new array
37K/s
Splice
36K/s
Pop all values
23K/s
View exact numbers
Test name
Executions per second
✓
Set length to zero
40,232 Ops/sec
Just instantiate new array
36,738 Ops/sec
Splice
36,431 Ops/sec
Pop all values
22,694 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(); }