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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Modify an Array Stored in an Object

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 friendparameter 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

Solution 1 (Click to Show/Hide)

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"));