Run results for: Instanceof vs string comparison vs property checking vs constructor comparison

Run details:

User agent: Mozilla/5.0 (Android 12; Mobile; rv:138.0) Gecko/138.0 Firefox/138.0

Browser: Firefox Mobile 138

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

string type

353.1M/s

constructor comparison

352.7M/s

string type + undefined

352.0M/s

property

350.4M/s

instanceof

23.6M/s

View exact numbers

HTML Preparation code:

<script>
class TestClass {
    constructor() {
        this.a = 2;
        this.t = 'mesh';
    }
}
</script>

Script Preparation code:

var obj = new TestClass();

Tests: