Run results for: instanceof vs in

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Whale/3.24.223.18 Safari/537.36

Browser: Chrome 120

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

in test

15.3M/s

instanceof test

7.7M/s

View exact numbers

Test name	Executions per second
✓ in test	15,319,705 Ops/sec
instanceof test	7,729,020 Ops/sec

Script Preparation code:

class ClassFoo {
    constructor() {
        this.bar = 1;
    }
}

var Foo = ClassFoo;
var foo = new Foo();

Tests: