[Solved] Examine the following method in an order state machine:def refund_order(self): if self.state == 'Delivered': self.state = 'Refunded' else:... | LLD

LLD - Design — Online Shopping Cart

Examine the following method in an order state machine:

def refund_order(self):
    if self.state == 'Delivered':
        self.state = 'Refunded'
    else:
        print('Refund not allowed')

What is the issue with this implementation?

AIt incorrectly changes state without validation

BIt allows refund only after delivery, ignoring cancellations

CIt permits refund from any state

DIt does not handle the 'Refunded' state properly

Step-by-Step Solution

Solution:

Step 1: Review the refund logic
The method allows refund only if the order is in 'Delivered' state.
Step 2: Identify missing cases
Refunds might also be valid for 'Cancelled' orders or other states depending on business rules, but this method ignores them.
Final Answer:
It allows refund only after delivery, ignoring cancellations -> Option B
Quick Check:
Check if all valid refund states are covered [OK]

Quick Trick: Check if all valid states are handled for refund [OK]

Common Mistakes:

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