qetr1ck-op

let obj = {};

console.log(obj.toString()) // [object Object] ???

qetr1ck-op

function Rabbit(name) {
  this.name = name;
}
Rabbit.prototype.sayHi = function() {
  console.log( this.name );
}

var rabbit = new Rabbit('Rabbit');

rabbit.sayHi(); // (1) ?

qetr1ck-op

function Rabbit(name) {}
Rabbit.prototype = {
  eats: true
};

var rabbit = new Rabbit();

delete Rabbit.prototype.eats; // (*)

console.log( rabbit.eats ); // (5) ?

qetr1ck-op

function Rabbit(name) {}
Rabbit.prototype = {
  eats: true
};

var rabbit = new Rabbit();

delete rabbit.eats; // (*)

console.log( rabbit.eats ); // (4) ?

qetr1ck-op

function Rabbit(name) {}
Rabbit.prototype = {
  eats: true
};

var rabbit = new Rabbit();

Rabbit.prototype.eats = false; // (*)

console.log( rabbit.eats ); // (3) ?

qetr1ck-op

function Rabbit() {}
Rabbit.prototype = {
  eats: true
};

var rabbit = new Rabbit();

Rabbit.prototype = {}; // (*)

console.log( rabbit.eats ); // (2) ?

qetr1ck-op

function Rabbit(name) {}
Rabbit.prototype = {
  eats: true
};

var rabbit = new Rabbit();

Rabbit.prototype.eats = false;

console.log( rabbit.eats );

qetr1ck-op

function Rabbit() {}

Rabbit.prototype = {
  eats: true
};

var rabbit = new Rabbit();

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

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

qetr1ck-op

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

var rabbit = {
  __proto__: animal
};