[removed] find the prototype object to which a property belongs

Question

I have an instance from Square which inherits from Rectangle

instance instanceof Rectangle --> true
instance instanceof Square    --> true
instance.are         


        

Answer 1

Replying to you comment: What you essentially seem to want is to call a function of the base class inside the overriding function of an inherited class.

I wouldn't bother with the prototype chain in your case, you can just build base into your inheritance model:

function Rectangle() {}
Rectangle.prototype.area = function () {
    console.log("rectangle");
};

//setting up inheritance
function Square() {}
Square.prototype = Object.create(Rectangle.prototype);
Square.prototype.base = Rectangle.prototype;

Square.prototype.area = function () {
    this.base.area();
    console.log("square");
};

var square = new Square();
square.area();

FIDDLE