Run results for: instanceof vs property in

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/118.0

Browser: Firefox 118

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

HTML Preparation code:

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

Script Preparation code:

var obj = new TestClass();

Tests: