How would you extend an order state machine to handle Return Requested and Returned states without breaking existing flows?

hard📝 Trade-off Q9 of Q15

LLD - Design — Online Shopping Cart

How would you extend an order state machine to handle Return Requested and Returned states without breaking existing flows?

AAllow direct transition from 'Pending' to 'Returned'

BReplace 'Delivered' state with 'Returned' state

CRemove 'Cancelled' state to simplify flow

DAdd new states and update transition table with new valid moves

Step-by-Step Solution

Solution:

Step 1: Understand extension without breaking existing flows
Adding states and updating transitions preserves old flows.
Step 2: Evaluate other options
Replacing or removing states breaks flow; direct jump is invalid.
Final Answer:
Add new states and update transition table with new valid moves -> Option D
Quick Check:
Extend by adding states and transitions [OK]

Quick Trick: Extend by adding states and transitions carefully [OK]

Common Mistakes:

MISTAKES

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