Run results for: instanceof vs property in

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 YaBrowser/24.7.0.0 Safari/537.36

Browser: Yandex Browser 24

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

property in

41.4M/s

instanceof

16.1M/s

property undefined

15.1M/s

View exact numbers

HTML Preparation code:

<script>
class TestClass {
    constructor() {
        this.a = 2;
    }
}
</script>

Script Preparation code:

var obj = new TestClass();

Tests: