Run results for: instanceof vs property in

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0) Gecko/20100101 Firefox/135.0

Browser: Firefox 135

Operating system: Windows

Device Platform: Desktop

Date tested: 2 months ago

HTML Preparation code:

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

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

Script Preparation code:

var obj = new TestClass();

 
var obj = new TestClass();

Tests: