Advanced Update Patterns

So far we’ve used mkUpdate to create pure update functions that simply transform state based on messages. However, real-world applications often need more sophisticated behavior: logging transitions, performing side effects, or explicitly handling invalid transitions. Transit provides three advanced patterns to cover these scenarios:

• Monadic Updates (mkUpdateM) - perform effects during transitions
• Error Handling (mkUpdateMaybe) - explicitly track valid vs invalid transitions
• Combining Both (mkUpdateMaybeM) - effects with error handling

Let’s explore each pattern in detail.