LLD - Design — Online Shopping Cart
In a typical observer pattern, which method signature correctly defines the function to update observers when the subject's state changes?
In a typical observer pattern, which method signature correctly defines the function to update observers when the subject's state changes?
easy🧠 Conceptual Q3 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand observer pattern roles
The observer has an update method that the subject calls to notify changes.Step 2: Identify correct method signature
The update method typically takes the subject as a parameter to access its state.Final Answer:
def update(self, subject): -> Option BQuick Check:
Update method with subject parameter [OK]
Quick Trick: Update method usually takes subject as parameter [OK]
Common Mistakes:
MISTAKES- Confusing notify with update method
- Using add_observer as notification method
- Omitting subject parameter in update
Master "Design — Online Shopping Cart" in LLD
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore LLD Quizzes