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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=558704" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 17_6_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.6 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 17
Operating system:
iOS 17.6.1
Device Platform:
Mobile
Date tested:
one year ago
Test name
Executions per second
for
180507.5 Ops/sec
foreach
232241.6 Ops/sec
for in
245593.5 Ops/sec
for..of
250279.8 Ops/sec
reduce
6742361.5 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);