[Solved] If an event store contains these events:1: ProductAdded {productId: 10, qty: 5}2: ProductRemoved {productId: 10, qty: 2}What is the total quantity after replay? | Microservices

Microservices - Event-Driven Architecture

If an event store contains these events:
1: ProductAdded {productId: 10, qty: 5}
2: ProductRemoved {productId: 10, qty: 2}
What is the total quantity after replay?

A5

B3

C2

D7

Step-by-Step Solution

Solution:

Step 1: Calculate quantity changes
First event adds 5, second removes 2, net is 5 - 2 = 3.
Step 2: Confirm final quantity
After replaying both events, quantity is 3.
Final Answer:
3 -> Option B
Quick Check:
Quantity after events = 3 [OK]

Quick Trick: Add and subtract event quantities to find current total [OK]

Common Mistakes:

MISTAKES

Ignoring removal event
Adding quantities instead of subtracting
Using only one event

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More Microservices Quizzes

If an event store contains these events:

Step 1: Calculate quantity changes

Step 2: Confirm final quantity

Final Answer:

Quick Check:

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