Good Example of JavaScript's Prototype-Based Inheritance

Question

I have been programming with OOP languages for over 10 years but I\'m learning JavaScript now and it\'s the first time I\'ve encountered prototype-based inheritance. I tend

Answer 1

function Shape(x, y) {
    this.x = x;
    this.y = y;
}

// 1. Explicitly call base (Shape) constructor from subclass (Circle) constructor passing this as the explicit receiver
function Circle(x, y, r) {
    Shape.call(this, x, y);
    this.r = r;
}

// 2. Use Object.create to construct the subclass prototype object to avoid calling the base constructor
Circle.prototype = Object.create(Shape.prototype);