def linear_search_iterative(array, item):
    """Incrementing index until item is found in the array iteratively.

        array: list
        item: str

        Best case running time: O(1) if the item is at the beginning of the array.
        Worst case running time: O(n) if the item is last in the array.
        """
    for index, value in enumerate(array):
        if item == value:
            return index  # found
    return None