Run results for: InstanceOf vs flag

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser: Chrome 124

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

flag check

21.1M/s

instanceof

9.1M/s

View exact numbers

Test name	Executions per second
✓ flag check	21,100,930 Ops/sec
instanceof	9,125,491 Ops/sec

HTML Preparation code:

<script>
class TestClass {
    constructor() {
        this.a = 2;
        this.t = 1;
    }
}
</script>

Script Preparation code:

var obj = new TestClass();

Tests: