Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Run results for:
Object loops: for...in vs Object.keys+forEach (ES5) vs for...of (ES6) vs Object.entries (ES8)
Go to the benchmark
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=520542" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Linux; Android 14; SM-S928B) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.6261.149 Mobile Safari/537.36 OPR/81.6.4292.79147
Browser:
Opera Mobile 81
Operating system:
Android
Device Platform:
Mobile
Date tested:
2 years ago
Test name
Executions per second
for...in
5460.6 Ops/sec
Object.keys+forEach (ES5)
8041.0 Ops/sec
for...of - keys (ES6)
7939.3 Ops/sec
for...of - values (ES6)
7061.0 Ops/sec
for...of - entries (ES8)
5888.1 Ops/sec
Object.entries (ES8)
5880.6 Ops/sec
Script Preparation code:
var obj = {}; for (let i = 0; i < 1000; i++) { obj['abc_' + i] = i; } function foo(bar) { return bar * 2 * 2; }
Tests:
for...in
for (const key in obj) { if (obj.hasOwnProperty(key)) foo(obj[key]); }
Object.keys+forEach (ES5)
Object.keys(obj).forEach(function(key) { foo(obj[key]); });
for...of - keys (ES6)
for (const key of Object.keys(obj)) { foo(obj[key]); }
for...of - values (ES6)
for (const value of Object.values(obj)) { foo(value); }
for...of - entries (ES8)
for (const [key, value] of Object.entries(obj)) { foo(value); }
Object.entries (ES8)
Object.entries(obj).forEach(function(key, value) { foo(value); });