qetr1ck-op

var animal = {
  eats: true
};

var rabbit = {
  jumps: true,
  __proto__: animal
};

for (var key in rabbit) {

qetr1ck-op

var animal = {
  eats: true
};

var rabbit = {
  jumps: true,
  __proto__: animal
};

for (var key in rabbit) {

qetr1ck-op

var rabbit = {foo: 'bar'};

rabbit.__proto__ = window;

console.log(rabbit.location) // call location object through window object

qetr1ck-op

let owl = {
    sayHello(str) {
      return `Hello ${str} !`;
    } 
}

let winnie = {};
winnie.__proto__ = owl;

let donkey = {};

qetr1ck-op

let animal = {},
  rabbit = {};
  
Object.setPrototypeOf(rabbit, animal); // rabbit.__proto__ = animal

console.log(Object.getPrototypeOf(rabbit) === animal ) // true

qetr1ck-op

var animal = {eats: true};

var rabbit = Object.create(animal); //rabbit.__proto__ = animal

console.log(rabbit.eats) //true

qetr1ck-op

var data = Object.create(null);
data.text = "Hello!";

console.log(data.text); // Hello!
console.log(data.toString); // undefined

console.log(data.__proto__); 

qetr1ck-op

let animal = {
  jumps: null
};
let rabbit = {
  jumps: true
};

rabbit.__proto__ = animal;

console.log( rabbit.jumps ); // ? (1)

qetr1ck-op

var animal = {
  eat: function() {
    this.full = true;
  }
};

var rabbit = {
  __proto__: animal
};

qetr1ck-op

var animal = {
  eats: true
};

function Rabbit(name) {
  this.name = name;
  //this.__proto__ = animal; won't work in IE10+
}

Rabbit.prototype = animal; //only object, primitives won't work