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Run results for:
empty an array in JavaScript and then reassign again
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=506190" 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
Just instantiate new array
165.9M/s
Set length to zero
19.0M/s
View exact numbers
Test name
Executions per second
✓
Just instantiate new array
165,872,608 Ops/sec
Set length to zero
19,034,412 Ops/sec
Tests:
Just instantiate new array
let arr1 = ["a", "b", "c", "d", "e", "f"]; arr1 = [1,2,3,4,5];
Set length to zero
const arr2 = ["a", "b", "c", "d", "e", "f"]; arr2.length = 0; arr2.push(1,2,3,4,5)