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Run results for:
Array splice is slow
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=569829" 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/131.0.0.0 Safari/537.36
Browser:
Chrome 131
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
With Array.splice
22601312.0 Ops/sec
Tweaked version
57614344.0 Ops/sec
Tests:
With Array.splice
function arrayInsert(array, index, value) { array.splice(index, 0, value); } const months = ['Jan', 'March', 'April', 'June']; arrayInsert(months, 1, 'Feb');
Tweaked version
function arrayInsert(array, index, value) { let end = array.length; while (end > index) { const previousEnd = end - 1; array[end] = array[previousEnd]; end = previousEnd; } array[index] = value; } const months = ['Jan', 'March', 'April', 'June']; arrayInsert(months, 1, 'Feb');