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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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<iframe src="https://measurethat.net/Embed?id=596281" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:136.0) Gecko/20100101 Firefox/136.0
Browser:
Firefox 136
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
one year ago
Array.reduce
60.4M/s
Array.filter
44.6M/s
View exact numbers
Test name
Executions per second
✓
Array.reduce
60,449,460 Ops/sec
Array.filter
44,556,196 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);