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What is the main purpose of the Observer pattern in system design?

easy🧠 Conceptual Q11 of Q15
LLD - Behavioral Design Patterns — Part 1

What is the main purpose of the Observer pattern in system design?

ATo create a strict hierarchy of classes
BTo allow objects to automatically update when another object changes
CTo store data in a database
DTo improve the speed of a single function
Step-by-Step Solution
Solution:

  1. Step 1: Understand the Observer pattern role

    The Observer pattern is designed to let one object notify others about changes automatically.

  2. Step 2: Match purpose with options

    To allow objects to automatically update when another object changes correctly describes automatic updates between objects without tight coupling.

  3. Final Answer:

    To allow objects to automatically update when another object changes -> Option B

  4. Quick Check:

    Observer pattern = automatic updates [OK]
Quick Trick: Observer means automatic update on change [OK]
Common Mistakes:
MISTAKES
  • Confusing Observer with data storage
  • Thinking it creates class hierarchies
  • Assuming it improves function speed

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