Run results for: InstanceOf vs String type

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/116.0.5845.118 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 116

Operating system: iOS 16.1

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
instanceof	6596957.5 Ops/sec
string type	15747231.0 Ops/sec
string type + undefined	5289735.0 Ops/sec
property	5333776.0 Ops/sec

HTML Preparation code:

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

Script Preparation code:

var obj = new TestClass();

Tests:

instanceof
obj instanceof TestClass;
string type
obj.t === 'mesh'
string type + undefined
obj.t !== undefined
property
obj.a !== undefined

Run results for: InstanceOf vs String type

Measure the performance of instanceOf operator vs comparing a basic string type.

instanceof

string type

string type + undefined

property