Given an array of integers arr, create a function that returns an array containing the values of arr without duplicates (the order doesn't matter).
Example 1:
Input: arr = [4, 2, 5, 3, 3, 1, 2, 4, 1, 5, 5, 5, 3, 1]
Output: [4, 2, 5, 3, 1]
Example 2:
Input: arr = [1, 1, 1, 1, 1, 1, 1, 1]
Output: [1]
Example 3:
Input: arr = [4, 4, 2, 3, 2, 2, 4, 3]
Output: [4, 2, 3]