freeCodeCamp/curriculum/challenges/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
---

## Description
<section id='description'>
You can add new properties to existing JavaScript objects the same way you would modify them.
Here's how we would add a <code>"bark"</code> property to <code>ourDog</code>:
<code>ourDog.bark = "bow-wow";</code>
or
<code>ourDog["bark"] = "bow-wow";</code>
Now when we evaluate <code>ourDog.bark</code>, we'll get his bark, "bow-wow".
</section>

## Instructions
<section id='instructions'>
Add a <code>"bark"</code> property to <code>myDog</code> and set it to a dog sound, such as "woof". You may use either dot or bracket notation.
</section>

## Tests
<section id='tests'>

```yml
- text: Add the property <code>"bark"</code> to <code>myDog</code>.
  testString: 'assert(myDog.bark !== undefined, "Add the property <code>"bark"</code> to <code>myDog</code>.");'
- text: Do not add <code>"bark"</code> to the setup section
  testString: 'assert(!/bark[^\n]:/.test(code), "Do not add <code>"bark"</code> to the setup section");'

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='js-seed'>

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

ourDog.bark = "bow-wow";

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

// Only change code below this line.

```

</div>


### After Test
<div id='js-teardown'>

```js
console.info('after the test');
```

</div>

</section>

## Solution
<section id='solution'>


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

</section>