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Run results for:
Sum array: for vs forEach vs for..in vs for..of vs reduce
Compare loop performance
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<iframe src="https://measurethat.net/Embed?id=558798" 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/129.0.0.0 Safari/537.36
Browser:
Chrome 129
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
reduce
10.2M/s
for..of
8.8M/s
foreach
6.1M/s
for in
241K/s
for
172K/s
View exact numbers
Test name
Executions per second
✓
reduce
10,205,020 Ops/sec
for..of
8,784,730 Ops/sec
foreach
6,051,232 Ops/sec
for in
240,609 Ops/sec
for
172,097 Ops/sec
Script Preparation code:
var array = new Array(100); for (let i = 0; i < 100; i++) { array[i] = i * i; }
Tests:
for
let sum = 0 for (let i = 0; i < array.length; i++) { sum += array[i]; }
foreach
let sum = 0; array.forEach(function(i) { sum += i; });
for in
let sum = 0; for (var i in array) { sum += array[i]; }
for..of
let sum = 0; for (var i of array) { sum += i; }
reduce
array.reduce((a, b) => a + b, 0);