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You are designing a payment system that supports multiple payment methods (credit card, PayPal, cryptocurrency). How would applying the Strategy pattern improve your system design?

hard📝 Trade-off Q15 of Q15

LLD - Behavioral Design Patterns — Part 1

You are designing a payment system that supports multiple payment methods (credit card, PayPal, cryptocurrency). How would applying the Strategy pattern improve your system design?

AIt requires hardcoding all payment methods inside a single class

BIt forces all payment methods to share the same implementation details

CIt prevents runtime selection of payment methods

DIt allows adding new payment methods without changing existing code by defining each as a separate strategy

Step-by-Step Solution

Solution:

Step 1: Understand Strategy pattern benefits in payment methods
Strategy pattern lets you define each payment method as a separate strategy class implementing a common interface.
Step 2: Analyze how this affects system design
This design allows adding new payment methods easily without modifying existing code, and lets the system select payment method at runtime.
Final Answer:
It allows adding new payment methods without changing existing code by defining each as a separate strategy -> Option D
Quick Check:
Strategy pattern = easy extension and runtime choice [OK]

Quick Trick: Strategy pattern enables easy addition and runtime choice [OK]

Common Mistakes:

MISTAKES

Thinking Strategy forces shared implementation
Believing all methods must be hardcoded together
Assuming runtime selection is not possible

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