[Solved] In this Kafka event sourcing code, the final state is incorrect:state = 0 for event in events: if event['type'] == 'withdrawal': state -= event['amount'] else: state = event['amount']What is the bug? | Kafka

Kafka - Event-Driven Architecture

In this Kafka event sourcing code, the final state is incorrect:

state = 0
for event in events:
    if event['type'] == 'withdrawal':
        state -= event['amount']
    else:
        state = event['amount']

What is the bug?

AMissing event type check for deposits

BElse resets state instead of adding deposits

CWithdrawal should add amount, not subtract

DState should be initialized to None

Step-by-Step Solution

Solution:

Step 1: Analyze else block effect
Else resets state to event amount, losing previous total.
Step 2: Correct logic for deposits
Else should add event amount to state, not reset it.
Final Answer:
Else resets state instead of adding deposits -> Option B
Quick Check:
Bug = state reset instead of accumulation [OK]

Quick Trick: Add deposits, don't reset state in else block [OK]

Common Mistakes:

MISTAKES

Master "Event-Driven Architecture" in Kafka

9 interactive learning modes - each teaches the same concept differently

More Kafka Quizzes

In this Kafka event sourcing code, the final state is incorrect: