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Run results for:
instanceof vs constructor.name vs field
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<iframe src="https://measurethat.net/Embed?id=619523" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.0 Safari/605.1.15
Browser:
Safari 26
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
6 months ago
Test name
Executions per second
instanceof
493350656.0 Ops/sec
constructor.name
452976000.0 Ops/sec
field
513789984.0 Ops/sec
Script Preparation code:
var A = class A { _className = 'A' } var a = new A()
Tests:
instanceof
var b = a instanceof A
constructor.name
var b = a.constructor.name === 'A'
field
var b = a._className === 'A'