Interview Q&A

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How does the SOLID principle relate to OOP?

Short answer: SOLID principles are design guidelines that enhance maintainability, flexibility, and scalability of OOP systems. They guide proper use of abstraction, inheritance, encapsulation, and polymorphism. Real-wor…

OOP Read answer
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Can interfaces help in event-driven architectures?

Short answer: Yes, interfaces can define event contracts for publishers/subscribers. Enables decoupling of event producers and consumers. Real-world example (ShopNest) Checkout calls IPaymentGateway.Charge() . Razorpay a…

OOP Read answer

C# OOP C# Programming Tutorial · OOP

Short answer: SOLID principles are design guidelines that enhance maintainability, flexibility, and scalability of OOP systems. They guide proper use of abstraction, inheritance, encapsulation, and polymorphism.

Real-world example (ShopNest)

ShopNest splits “save order” and “send email” into different services (SRP). The order service depends on IEmailSender (DIP), so unit tests can fake email.

Say this in the interview

  1. Define — one clear sentence (the short answer above).
  2. Example — relate it to a project like ShopNest or your real work.
  3. Trade-off — when you would not use it.
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C# OOP C# Programming Tutorial · OOP

Short answer: Yes, interfaces can define event contracts for publishers/subscribers. Enables decoupling of event producers and consumers.

Real-world example (ShopNest)

Checkout calls IPaymentGateway.Charge(). Razorpay and Stripe adapters implement the same interface, so ShopNest can switch gateways without rewriting the order service.

Say this in the interview

  1. Define — one clear sentence (the short answer above).
  2. Example — relate it to a project like ShopNest or your real work.
  3. Trade-off — when you would not use it.
Permalink & share
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