Instanceof current class in nodejs

Question

I want to test if a variable is an instance of the current class. So I'm checking within a method of the class. And I was hoping there's a more abstract way of doing than specifying the class name. In PHP it's possible with the self keyword.

In PHP it's done like this:

if ($obj instanceof self) {

}

What's the equivalent in nodejs ?

Answer 1

Considering your comment (emphasis mine):

I want to test if a variable is an instance of the current class. So I'm checking within a method of the class. And I was hoping there's a more abstract way of doing than specifying the class name. In PHP it's possible with the self keyword.

I would say that self in this instance would kind of map to this.constructor. Consider the following:

class Foo {}
class Bar {}
class Fizz {
  // Member function that checks if other 
  // is an instance of the Fizz class without 
  // referring to the actual classname "Fizz"
  some(other) {
    return other instanceof this.constructor;
  }
}

const a = new Foo();
const b = new Foo();
const c = new Bar();
const d = new Fizz();
const e = new Fizz();

console.log(a instanceof b.constructor); // true
console.log(a instanceof c.constructor); // false
console.log(d.some(a)); // false
console.log(d.some(e)); // true