95 lines
1.7 KiB
Markdown
95 lines
1.7 KiB
Markdown
---
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id: 56bbb991ad1ed5201cd392d2
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title: Add New Properties to a JavaScript Object
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challengeType: 1
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videoUrl: 'https://scrimba.com/c/cQe38UD'
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forumTopicId: 301169
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---
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## Description
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<section id='description'>
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You can add new properties to existing JavaScript objects the same way you would modify them.
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Here's how we would add a <code>"bark"</code> property to <code>ourDog</code>:
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<code>ourDog.bark = "bow-wow";</code>
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or
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<code>ourDog["bark"] = "bow-wow";</code>
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Now when we evaluate <code>ourDog.bark</code>, we'll get his bark, "bow-wow".
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</section>
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## Instructions
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<section id='instructions'>
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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.
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: Add the property <code>"bark"</code> to <code>myDog</code>.
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testString: assert(myDog.bark !== undefined);
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- text: Do not add <code>"bark"</code> to the setup section
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testString: assert(!/bark[^\n]:/.test(code));
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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// Example
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var ourDog = {
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"name": "Camper",
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"legs": 4,
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"tails": 1,
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"friends": ["everything!"]
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};
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ourDog.bark = "bow-wow";
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// Setup
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var myDog = {
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"name": "Happy Coder",
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"legs": 4,
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"tails": 1,
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"friends": ["freeCodeCamp Campers"]
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};
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// Only change code below this line.
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```
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</div>
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### After Test
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<div id='js-teardown'>
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```js
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(function(z){return z;})(myDog);
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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var myDog = {
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"name": "Happy Coder",
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"legs": 4,
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"tails": 1,
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"friends": ["freeCodeCamp Campers"]
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};
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myDog.bark = "Woof Woof";
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```
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</section>
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