def search_iterator(lines, start=0):
    """Search for iterators in the code

    Args:
        lines ([list]): A list with Javascript syntax as strings.
        start ([int, optional]): The start line to start to search by iterators. Defaults to 0.

    Returns:
        [list]: A list of tuple (index, operator)
    """
    save_lines = list()
    iterator_ops = ["--", "++", "+=", "-="]
    for iterator_op in iterator_ops:
        for index in range(start, len(lines)):
            if iterator_op in lines[index]:
                save_lines.append((index, iterator_op))
    return save_lines