Benchmark: instanceof vs constructor check vs field

Script Preparation code:

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

Tests:

Rendered benchmark preparation results:

Previous results

Latest run results:

Run details: (Test run date: 9 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36

Browser/OS: Chrome 141 on Mac OS X 10.15.7

constructor

174.6M/s

field

174.2M/s

instanceof

160.3M/s

constructor.name

54.2M/s

View exact numbers

instanceof vs constructor check vs field (version: 1)