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Run results for:
for..in vs for..of vs classic for
Testing the difference between for..in vs for..of vs classic for
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<iframe src="https://measurethat.net/Embed?id=589466" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0) Gecko/20100101 Firefox/135.0
Browser:
Firefox 135
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Benchmark engine:
Benchmark.js
for..of
55/s
classic for
52/s
for..in
12/s
View exact numbers
Test name
Executions per second
✓
for..of
55 Ops/sec
classic for
52 Ops/sec
for..in
12 Ops/sec
HTML Preparation code:
<div id='test'></div>
Tests:
classic for
const arr = Array.from(Array(1000000).keys()); const odds = [] for(i=0; i<arr.length; i++){ const value = arr[i]; odds[i] = (value%2 === 0) ? 'odd' : 'even'; }
for..of
const arr = Array.from(Array(1000000).keys()); const odds = [] for (const value of arr) { odds[value] = (value%2 === 0) ? 'odd' : 'even'; }
for..in
const arr = Array.from(Array(1000000).keys()); const odds = [] for (const value in arr) { odds[value] = (value%2 === 0) ? 'odd' : 'even'; }