LLD - Design — Online Shopping Cart
In an order state machine, which scenario represents a valid transition?
In an order state machine, which scenario represents a valid transition?
easy🧠 Conceptual Q2 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand valid transitions
Valid transitions follow the logical order of states in the order lifecycle.Step 2: Analyze each option
From 'Delivered' to 'Cancelled' is invalid because once delivered, an order cannot be cancelled. From 'Pending' to 'Confirmed' is valid as 'Pending' orders can move to 'Confirmed'. From 'Cancelled' to 'Shipped' is invalid because cancelled orders cannot be shipped. From 'Shipped' to 'Pending' is invalid because shipped orders cannot revert to pending.Final Answer:
From 'Pending' to 'Confirmed' -> Option AQuick Check:
Check logical order of states [OK]
Quick Trick: Transitions must follow order lifecycle sequence [OK]
Common Mistakes:
MISTAKES- Assuming any state can transition to any other
- Allowing backward transitions without reason
- Confusing terminal states with intermediate states
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