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Run results for:
`filter().length` vs. `reduce` vs. `for`
Compare `filter().length` vs `reduce` vs `for` loop for counting array elements that are present in another array.
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=608417" 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/137.0.0.0 Safari/537.36
Browser:
Chrome 137
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
reduce
1.0M/s
filter().length
994K/s
for loop
988K/s
View exact numbers
Test name
Executions per second
✓
reduce
1,017,259 Ops/sec
filter().length
993,662 Ops/sec
for loop
987,676 Ops/sec
Script Preparation code:
var sample = Array(1000).fill(0).map((_, idx) => idx); var selected = [10, 134, 245, 355, 489, 583, 682, 823, 2081, 3892, 4892, 5829, 6832];
Tests:
filter().length
var total = selected.filter(id => sample.includes(id)).length;
reduce
var total = selected.reduce((total, id) => total + (sample.includes(id) ? 1 : 0), 0);
for loop
var total = 0; for (const id of selected) { if (sample.includes(id)) { total++; } }