proto.js

let livingThing = {
    doesLiveInfinitely() {
        console.log("I do not live infinitely.")
    }
}

let animal = {
    eats: true,
    walk() {
      console.log("Animal walks");
    },
    __proto__: livingThing
};

let rabbit = {
    jumps: true,
    __proto__: animal
}

console.log(rabbit.jumps);
rabbit.walk()
rabbit.doesLiveInfinitely()