LLD - Design — Splitwise (Expense Sharing)
In a system with User, Group, and Expense classes, which class should track who paid for an expense?
In a system with User, Group, and Expense classes, which class should track who paid for an expense?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify responsibility of Expense class
Expense class represents costs and payments, so it should track who paid.Step 2: Exclude other classes
User class holds user info, Group class holds users, Payment class is not defined here.Final Answer:
Expense class -> Option DQuick Check:
Who paid expense = Expense class [OK]
Quick Trick: Payment info belongs in Expense class [OK]
Common Mistakes:
- Assigning payment info to User class
- Confusing Group class with payment tracking
- Assuming Payment class exists
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