shift()

Remove the first element of the array and return it.

Implementation

Args: array: The list to shift. Returns: The first element of the array if it is not empty, otherwise None.

                            array = [1, 2, 3]
item = shift(array)
item
                        

Expected output: 1

Alternative usage:

array

Expected output: [2, 3]

                        def shift(array: List[T]) -> Optional[T]:
    if array:
        return array.pop(0)
    return None
                    