Why Choose Polling Over Callbacks in Game Development?

Not everything needs to focus on efficiency. In many cases, keeping the system simple and predictable can lead to better outcomes down the line. Polling is generally lightweight and integrates nicely with the frame-based model of Unity.

Polling is simpler in many scenarios. For one, you know exactly when the polling occurs and the order in which things are checked, especially if you have multiple inputs. With callbacks, it’s a bit messier since states might trigger the callback at different times, requiring you to track various state changes. Also, when polling happens once per update, you can avoid issues where the callback state might be activated multiple times within that frame. If you have a complex state to check, a single centralized polling can be more efficient than multiple callbacks firing off for every action during an update.

In Unity, polling aligns perfectly with the frame-based update system. Since most gameplay mechanics run every frame, checking input states in that cycle is manageable performance-wise—essentially free. Callbacks, while handy for one-off events, can create timing and ordering issues if they fire at the wrong moment. Polling keeps input handling separated from other processes, which is a cleaner approach.