Benchmark: simple instanceof vs. getter vs. instance property

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

class ExampleClass {
    get isExampleGetter() {
        return true;
    }

    isExampleField = true;
}

const items = Array.from({
    length: 10000
}, (_) => new ExampleClass());

Tests:

instanceof
let validCount = 0; for (const i of items) { if (i instanceof ExampleClass) { validCount += 1; } } console.log(validCount);
getter
let validCount = 0; for (const i of items) { if (i.isExampleGetter) { validCount += 1; } } console.log(validCount);
instance property
let validCount = 0; for (const i of items) { if (i.isExampleField) { validCount += 1; } } console.log(validCount);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
instanceof
getter
instance property

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser/OS: Chrome 138 on Mac OS X 10.15.7

View result in a separate tab

getter

70K/s

instance property

48K/s

instanceof

34K/s

View exact numbers

Test name	Executions per second
✓ getter	69,724 Ops/sec
instance property	48,438 Ops/sec
instanceof	33,823 Ops/sec

simple instanceof vs. getter vs. instance property (version: 2)

Compare the basic performance of different ways of checking whether a given item is an instance of a specific class.

Comparing performance of: `instanceof vs getter vs instance property`

Created: one year ago by: Registered User

Go to the latest result

instanceof

getter

instance property

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

simple instanceof vs. getter vs. instance property (version: 2)

Compare the basic performance of different ways of checking whether a given item is an instance of a specific class.

Comparing performance of: instanceof vs getter vs instance property

Created: one year ago by: Registered User

Go to the latest result

instanceof

getter

instance property

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `instanceof vs getter vs instance property`