There is a piecewise function going through (-3, -4), (-1, 0), (0, 2), and (1, 4). Determine the intervals on which the functions are increasing, decreasing, or constant.

Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
Question: There is a piecewise function going through (-3, -4), (-1, 0), (0, 2), and (1, 4). Determine the intervals on which the functions are increasing, decreasing, or constant.

Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
Question: There is a piecewise function going through (-3, -4), (-1, 0), (0, 2), and (1, 4). Determine the intervals on which the functions are increasing, decreasing, or constant.
