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Run results for:
empty an array in JavaScript and then reassign
Based on question on http://stackoverflow.com/questions/1232040/how-do-i-empty-an-array-in-javascript
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=506189" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36 Edg/121.0.0.0
Browser:
Chrome 121
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
Benchmark engine:
Benchmark.js
Set length to zero
38K/s
Just instantiate new array
38K/s
View exact numbers
Test name
Executions per second
✓
Set length to zero
38,042 Ops/sec
Just instantiate new array
37,862 Ops/sec
Tests:
Just instantiate new array
var size = 10000; var arr1 = []; for (var i = 0; i < size; i++){ arr1.push(i); } arr1 = [1,2,3,4,5];
Set length to zero
var size = 10000; var arr2 = []; for (var i = 0; i < size; i++){ arr2.push(i); } arr2.length = 0; arr2.push(1,2,3,4,5)