[Solved] Given this order state machine code snippet:states = ['Pending', 'Processing', 'Shipped'] transitions = {('Pending', 'Processing'), ('Processing', 'Shipped')} current_state = 'Pending' next_state =... | LLD

LLD - Design — Online Shopping Cart

Given this order state machine code snippet:

states = ['Pending', 'Processing', 'Shipped']
transitions = {('Pending', 'Processing'), ('Processing', 'Shipped')}
current_state = 'Pending'
next_state = 'Shipped'
if (current_state, next_state) in transitions:
    print('Valid transition')
else:
    print('Invalid transition')

What will be printed?

AInvalid transition

BRuntime error

CSyntax error

DValid transition

Step-by-Step Solution

Solution:

Step 1: Check if ('Pending', 'Shipped') is in transitions
Transitions only include ('Pending', 'Processing') and ('Processing', 'Shipped').
Step 2: Determine if the condition is true
Since ('Pending', 'Shipped') is not in transitions, the else branch runs.
Final Answer:
Invalid transition -> Option A
Quick Check:
Transition check = Invalid transition [OK]

Quick Trick: Check if tuple exists in transitions set [OK]

Common Mistakes:

Assuming direct jump allowed
Confusing tuple membership syntax
Ignoring transition set contents

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More LLD Quizzes

Given this order state machine code snippet:

Step 1: Check if ('Pending', 'Shipped') is in transitions

Step 2: Determine if the condition is true

Final Answer:

Quick Check:

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