Remove duplicates from array: Swift

To remove duplicates from an array in Swift using a dictionary, we can create an empty dictionary and iterate through the array. For each element, we use it as a key in the dictionary and assign a dummy value. The dictionary automatically removes duplicate keys, so we end up with only unique elements. The time complexity of this approach is O(n), where n is the number of elements in the array, making it an efficient solution for removing duplicates..