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Run results for:
Object.keys(obj)[0] vs for in
Test the performance to retrieve the first key of an object
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<iframe src="https://measurethat.net/Embed?id=619946" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Android 15; Mobile; rv:144.0) Gecko/144.0 Firefox/144.0
Browser:
Firefox Mobile 144
Operating system:
Android
Device Platform:
Mobile
Date tested:
6 months ago
Test name
Executions per second
for-in
2493.5 Ops/sec
Object.keys
1221.4 Ops/sec
Script Preparation code:
var obj = {'a': 1}
Tests:
for-in
for (var i=10000; i > 0; i--) { let first for (let key in obj) { first = key break } }
Object.keys
for (var i=10000; i > 0; i--) { const first = Object.keys(obj)[0] }