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Run results for:
Object.entries vs for..in
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=581032" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
Browser:
Chrome 131
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
Object.entries (forEach)
17.4 Ops/sec
for..in
18.1 Ops/sec
Object.entries (for loop)
17.9 Ops/sec
Script Preparation code:
var obj = { a: 1, b: 2, c: 3, d: 4, 0: 'a', 1: 'b', str: 'long string', nested: { nested: 0 }, hello: 55.5 }; for (let i = 10; i < 10000; i++) { obj[""+i] = "test" }
Tests:
Object.entries (forEach)
Object.entries(obj).forEach((key, value) => console.log(key, value));
for..in
for (let key in obj) { if (obj.hasOwnProperty(key)) console.log(key, obj[key]); }
Object.entries (for loop)
for (let entries = Object.entries(obj), i = entries.length - 1, entry = entries[i]; i >= 0; entry = entries[i--]) { console.log(entry[0], entry[1]) }