What is the purpose of the 'checkWalls' function in the Hotspot Ball program?

The 'checkWalls' function serves the important role of monitoring the position of the ball in relation to the edges of the window. Its primary purpose is to identify when the ball has reached any boundary of the playable area. This functionality is crucial in games and animations to ensure appropriate behavior when the ball interacts with the edges, such as reversing direction or stopping to prevent it from moving out of view. By checking for collisions with the walls, the program can maintain a dynamic environment where the ball reacts correctly to the window's limits, enhancing the overall interactivity and experience of the program.

Other options discuss different functionalities that do not align with the function's defined purpose. For instance, determining the speed or changing the color of the ball pertains to different aspects of ball manipulation, while adding a new ball involves object creation rather than checking existing boundaries.