# Adding elements to multidimensional objects in JavaScript

Let we have the following object with students:

`let students = { 'group1': ['student11', 'student12', 'student13'], 'group2': ['student21', 'student22', 'student23'], 'group3': ['student31', 'student32'], };`

Let's add one more student to the first group:

`students.group1.push('student14');`

Let's now make one more, fourth group and add a student to it. To do this, you first need declare the new group as an array:

`students.group4 = [];`

And only then you can add students to it:

`students.group4.push('student41');`

Copy to yourself the following structure to store a to-do list for specific dates:

`let affairs = { '2019-12-28': ['data11', 'data12', 'data13'], '2019-12-29': ['data21', 'data22', 'data23'], '2019-12-30': ['data31', 'data32', 'data33'], }`

Add one more data-item to the date `'2019-12-29'`.

Add two more data-items to the date `'2019-12-31'`.

Copy to yourself the following structure to store the list of students:

`let students = { 'group1': { 'subgroup11': ['student111', 'student112', 'student113'], 'subgroup12': ['student121', 'student122', 'student123'], }, 'group2': { 'subgroup21': ['student211', 'student212', 'student213'], 'subgroup22': ['student221', 'student222', 'student223'], }, 'group3': { 'subgroup31': ['student311', 'student312', 'student313'], 'subgroup32': ['student321', 'student322', 'student323'], }, };`

Add a new student to the subgroup `'subgroup11'`.

Add one more subgroup to the first group.

Make the fourth group, make a subgroup in it and add two new students to it.

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