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Run results for:
Javascript: reduce VS for
Compare the "reduce" method with the "for" iteration method. Use case: There is an array with different numbers, we will compare the performance between the two methods to find the quantity of numbers greater than zero in the array list.
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<iframe src="https://measurethat.net/Embed?id=518793" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4 Safari/605.1.15
Browser:
Safari 17
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
Number 2: using reduce method
19.4M/s
Number 1: use for iterator
1.4M/s
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Test name
Executions per second
✓
Number 2: using reduce method
19,361,440 Ops/sec
Number 1: use for iterator
1,447,179 Ops/sec
Script Preparation code:
var list = [1, 0, -2, -1, 3, 0, 1, 8, -10, 3, 0, -1, -3];
Tests:
Number 1: use for iterator
let countNumberGreaterThanZero = 0; for (let i = 0; i < list.length; i++) { if (list[i] > 0) { countNumberGreaterThanZero++; } }
Number 2: using reduce method
let countsNumbersGreaterThanZero = (acc, cur) => acc + (cur > 0 ? 1 : 0); list.reduce(countsNumbersGreaterThanZero, 0)