Design patterns · interview question
When is the Observer Pattern a better fit than adding more code directly inside CheckoutService?
Multiple choiceHardchapter-13-curatedpremiumdesign-patternsobserver-pattern
Answer and explanation
Correct answer
A. When one order-completed event should trigger several independent reactions like email, analytics, and loyalty updates
Why
Observer helps when multiple side effects should respond to the same domain event without forcing checkout orchestration to know every downstream concern directly.
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