Check if object is a 'direct instance' of a class

Question

I have two classes:

class Bar extends Foo { // Foo isn\'t relevant
  constructor(value) {
    if (!(value instanceof Foo)) throw \"InvalidArgumentException:          


        

Answer 1

I coined the function for checking relationships between DOM Classes and elements

const getCreator = instance => Object.getPrototypeOf(instance).constructor.name;
// usage
getCreator(document.documentElement) === "HTMLHtmlElement;