freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/basic-data-structures/modify-an-array-stored-in-an-object/index.md

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title: Modify an Array Stored in an Object
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# Modify an Array Stored in an Object

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## Problem Explanation

- The function can be written in just two lines of code.
- The first line should just use the `push()` function to add the `friend`parameter to the array found in `user.data.friend`. The second line will return the modified array.
- Remember that `user` mustb be referenced with the first parameter given to the `addFriend()` function.


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## Solutions

<details><summary>Solution 1 (Click to Show/Hide)</summary>

```javascript
let user = {
  name: "Kenneth",
  age: 28,
  data: {
    username: "kennethCodesAllDay",
    joinDate: "March 26, 2016",
    organization: "freeCodeCamp",
    friends: ["Sam", "Kira", "Tomo"],
    location: {
      city: "San Francisco",
      state: "CA",
      country: "USA"
    }
  }
};

function addFriend(userObj, friend) {
  // change code below this line
  userObj.data.friends.push(friend);
  return userObj.data.friends;
  // change code above this line
}

console.log(addFriend(user, "Pete"));
```
</details>