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Run results for:
Array.isArray vs Object.prototype.toString vs [].constructor vs instanceof
Array.isArray vs Object.prototype.toString vs [].constructor vs instanceof
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<iframe src="https://measurethat.net/Embed?id=512476" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36
Browser:
Chrome 122
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
[].constructor
7.4M/s
Array.isArray
7.3M/s
instanceof
6.9M/s
Object.prototype.toString
6.2M/s
View exact numbers
Test name
Executions per second
✓
[].constructor
7,410,305 Ops/sec
Array.isArray
7,342,638 Ops/sec
instanceof
6,896,728 Ops/sec
Object.prototype.toString
6,177,485 Ops/sec
Tests:
Array.isArray
Array.isArray([])
instanceof
[] instanceof Array
[].constructor
[].constructor === Array
Object.prototype.toString
Object.prototype.toString.call([]) === '[object Array]'