Run results for: asdfasdfiuasgubasb[iunab[vn

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser: Chrome 135

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

typeof

165.0M/s

instanceof

152.2M/s

View exact numbers

Test name	Executions per second
✓ typeof	165,024,640 Ops/sec
instanceof	152,234,752 Ops/sec

Script Preparation code:

class Foo {
  constructor() {
    this.isStatic = true;
  }
}

class Bar extends Foo {
  constructor() {
    super();
    this.isStatic = false;
  }
}

const bar = new Bar();

Tests:

instanceof
Boolean(bar instanceof Bar)
typeof
Boolean(bar.isStatic)