LLD - Design — Food Delivery System
You want to extend an order tracking state machine to handle a 'return' event after delivery. Which design change is best?
You want to extend an order tracking state machine to handle a 'return' event after delivery. Which design change is best?
hard📝 Trade-off Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand order lifecycle
Orders are delivered before they can be returned, so 'returned' must come after 'delivered'.Step 2: Choose design that adds 'returned' state properly
Add a 'returned' state and allow transition from 'delivered' to 'returned' adds 'returned' state with valid transition from 'delivered', preserving lifecycle integrity.Final Answer:
Add a 'returned' state and allow transition from 'delivered' to 'returned' -> Option AQuick Check:
Extend state machine with valid new state [OK]
Quick Trick: Add new states with valid transitions only [OK]
Common Mistakes:
- Skipping required intermediate states
- Replacing existing states incorrectly
- Allowing invalid transitions
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