Run results for: instanceof vs constructor.name vs field

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: 11 months ago

Benchmark engine: Benchmark.js

field

513.8M/s

instanceof

493.4M/s

constructor.name

453.0M/s

View exact numbers

Script Preparation code:

var A = class A {
	_className = 'A'
}

var a = new A()

Tests: