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Run results for:
Count matches using Array reduce vs Array filter
Check if it's faster to count matches in an array using Array.filter or Array.reduce
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=577429" 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
Array.filter
53816032.0 Ops/sec
Array.reduce
110852544.0 Ops/sec
Script Preparation code:
var arr = ['a', 'b', 'c', 'a'];
Tests:
Array.filter
var count = arr.filter(item => item === 'a').length;
Array.reduce
var count = arr.reduce((acc, item) => { if (item === 'a') { acc++; } return acc; }, 0);