Run results for: instanceOf-bitwise

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36

Browser: Chrome 92

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
instanceOf	6824499.0 Ops/sec
flag check	6988771.0 Ops/sec

Script Preparation code:

class X {    
    
}

class Y extends X {    
}

var globalX = X;
var y = new Y();

var types = {
  'A': 1,
  'B': 2
}

class A {
  constructor() {
    this.type = types.A;
  }
}

class B extends A {
  constructor() {
    super();
    this.type = types.A | types.B;
  }
}

var b = new B();

Tests:

instanceOf
y instanceof globalX;
flag check
b.type & types.A;

Run results for: instanceOf-bitwise

instanceOf

flag check