---
id: 587d7db1367417b2b2512b85
title: Set the Child's Prototype to an Instance of the Parent
challengeType: 1
---
## Description
In the previous challenge you saw the first step for inheriting behavior from the supertype (or parent) Animal: making a new instance of Animal.
This challenge covers the next step: set the prototype of the subtype (or child)—in this case, Bird—to be an instance of Animal.
Bird.prototype = Object.create(Animal.prototype);
Remember that the prototype is like the "recipe" for creating an object. In a way, the recipe for Bird now includes all the key "ingredients" from Animal.
let duck = new Bird("Donald");
duck.eat(); // prints "nom nom nom"
duck inherits all of Animal's properties, including the eat method.
## Instructions
Modify the code so that instances of Dog inherit from Animal.
## Tests
```yml
tests:
- text: Dog.prototype should be an instance of Animal.
testString: assert(Animal.prototype.isPrototypeOf(Dog.prototype), 'Dog.prototype should be an instance of Animal.');
```
## Challenge Seed
```js
function Animal() { }
Animal.prototype = {
constructor: Animal,
eat: function() {
console.log("nom nom nom");
}
};
function Dog() { }
// Add your code below this line
let beagle = new Dog();
beagle.eat(); // Should print "nom nom nom"
```
## Solution
```js
function Animal() { }
Animal.prototype = {
constructor: Animal,
eat: function() {
console.log("nom nom nom");
}
};
function Dog() { }
Dog.prototype = Object.create(Animal.prototype);
let beagle = new Dog();
beagle.eat();
```