Run results for: instanceof vs in

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser: Chrome 130

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

in test

15.6M/s

instanceof test

8.5M/s

View exact numbers

Test name	Executions per second
✓ in test	15,647,790 Ops/sec
instanceof test	8,466,752 Ops/sec

Script Preparation code:

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

Tests: