This method return the number of the elements in the list.
Big-O: O(1)
Input: linkedList
Output: int
This method check the list is empty or not.
Big-O: O(1)
Input: None
Output: boolean
This method append the element to the list.
Big-O: O(1)
Input: None
Output: None
This method remove the node at the index.
Big-O: O(n) n = index
Input: int
Output: None
This method remove the nodes at multiple indexes.
Big-O: O(n) n = the biggest index in the list
Input: list
Output: None