Run results for: instanceof vs constructor.name vs field

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36

Browser: Chrome 141

Operating system: Windows

Device Platform: Desktop

Date tested: 10 months ago

Benchmark engine: Benchmark.js

instanceof

150.5M/s

field

147.2M/s

constructor.name

47.4M/s

View exact numbers

Script Preparation code:

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

Tests: