nth()

Gets the element at index n of array.

Implementation

Args: array: List passed in by the user. index: Index of element to return. Returns: Returns the element at :attr:`index`.

Example

nth([1, 2, 3, 4], 0)

Expected output: 1

Alternative usage:

nth([3, 4, 5, 6], 2)

Expected output: 5

Source Code

                        def nth(array: List[T], index: int) -> Optional[T]:

    length = len(array)
    if index < 0:
        idx = length + index
        if 0 <= idx < length:
            return array[idx]
    else:
        if 0 <= index < length:
            return array[index]
    return None
                    