freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/basic-data-structures/modify-an-object-nested-within-an-object/index.md

title

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Modify an Object Nested Within an Object

Modify an Object Nested Within an Object

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Problem Explanation

• Remember the object you want to change is two levels deep, dot-notation is easier to use in this instance.
• Simply define the object and then use dot-notation to access the second object and finally the final element you wish to modify.

Example:

let myObject = {
  level_1: "outside",
  first_level_object: {
    level_2: "2 levels deep",
    second_level_object: {
      level_3: "3 levels deep"
    }
  }
};
//The following line of code will modify the data found in level_2.
myObject.first_level_object.level_2 = "level-2 has been reached";

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Solutions

Solution 1 (Click to Show/Hide)

let userActivity = {
  id: 23894201352,
  date: "January 1, 2017",
  data: {
    totalUsers: 51,
    online: 42
  }
};

// change code below this line
userActivity.data.online = 45;
// change code above this line

console.log(userActivity);