Visualising Prototypes

    let log = console.log;
    
    let myObj = {};                                          // same as: new Object()
    log(myObj.constructor);                                  // function Object(){}
    log(myObj.__proto__ === myObj.constructor.prototype);    // {}
    
    function Cat() {
      //constructor for kitty
    }

    let kitty = new Cat();

    log(kitty.__proto__ === Cat.prototype);                 // Cat{}
    log(kitty.__proto__.__proto__ === Object.prototype);    // {}
    log(Object.prototype.__proto__);                        // null
    
    function Animal() {}
    
    Object.setPrototypeOf(Cat.prototype, Animal.prototype);
    log(kitty.__proto__);                                   // Cat{}
    log(kitty.__proto__.__proto__);                         // Animal {}
    log(kitty.__proto__.__proto__.__proto__);               // {}
    log(kitty.__proto__.__proto__.__proto__.__proto__);     // null