Prototype Chain

"use strict";

var animal = {
    kind: 'human'
};

console.log(animal);

var hafeez = {};

hafeez.__proto__ = animal;

console.log(hafeez.kind);

console.log(animal.isPrototypeOf(hafeez));

animal.kind = 'igloo';

console.log(hafeez.kind);
console.log(animal.kind);

// Use Object.create instead of `__proto__`
hafeez = Object.create(animal, {food: {value:"mango"}});
console.log(hafeez.kind, animal.kind);