freeCodeCamp/curriculum/challenges/espanol/02-javascript-algorithms-and-data-structures/basic-javascript/add-new-properties-to-a-javascript-object.md

---
id: 56bbb991ad1ed5201cd392d2
title: Add New Properties to a JavaScript Object
challengeType: 1
videoUrl: 'https://scrimba.com/c/cQe38UD'
forumTopicId: 301169
dashedName: add-new-properties-to-a-javascript-object
---

# --description--

You can add new properties to existing JavaScript objects the same way you would modify them.

Here's how we would add a `"bark"` property to `ourDog`:

`ourDog.bark = "bow-wow";`

or

`ourDog["bark"] = "bow-wow";`

Now when we evaluate `ourDog.bark`, we'll get his bark, "bow-wow".

Example:

```js
var ourDog = {
  "name": "Camper",
  "legs": 4,
  "tails": 1,
  "friends": ["everything!"]
};

ourDog.bark = "bow-wow";
```

# --instructions--

Add a `"bark"` property to `myDog` and set it to a dog sound, such as "woof". You may use either dot or bracket notation.

# --hints--

You should add the property `"bark"` to `myDog`.

```js
assert(myDog.bark !== undefined);
```

You should not add `"bark"` to the setup section.

```js
assert(!/bark[^\n]:/.test(code));
```

# --seed--

## --after-user-code--

```js
(function(z){return z;})(myDog);
```

## --seed-contents--

```js
// Setup
var myDog = {
  "name": "Happy Coder",
  "legs": 4,
  "tails": 1,
  "friends": ["freeCodeCamp Campers"]
};

// Only change code below this line
```

# --solutions--

```js
var myDog = {
  "name": "Happy Coder",
  "legs": 4,
  "tails": 1,
  "friends": ["freeCodeCamp Campers"]
};
myDog.bark = "Woof Woof";
```