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Dependency Injection

35 Dependency Injection interview questions

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DI Fundamentals


  • 1.

    What is Dependency Injection and why is it used in modern software development?

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  • 2.

    Explain the concept of Inversion of Control (IoC) and how it relates to Dependency Injection.

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  • 3.

    What are the main advantages of using Dependency Injection in a software project?

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  • 4.

    Describe the impact of Dependency Injection on the maintainability of code.

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  • 5.

    Can you explain the Dependency Inversion Principle and how it differs from Dependency Injection?

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Types of Dependency Injection


  • 6.

    Compare and contrast constructor injection versus setter injection.

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  • 7.

    When would you use method injection instead of constructor injection?

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  • 8.

    Can mixing different types of injection in the same class lead to issues? If so, what kind?

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  • 9.

    Is there a preferred type of dependency injection when working with immutable objects? Please explain.

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  • 10.

    How does each type of dependency injection affect the ease of unit testing?

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DI Containers and Frameworks


  • 11.

    What is a Dependency Injection container and what are its responsibilities?

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  • 12.

    Can you list some popular Dependency Injection frameworks and their distinctive features?

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  • 13.

    What is the difference between a Dependency Injection container and a service locator?

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  • 14.

    How do you configure dependencies within a DI container typically?

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  • 15.

    Describe a situation where you should opt for a lightweight DI container over a full-fledged framework.

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DI in Design Patterns


  • 16.

    How does Dependency Injection complement the Factory Design Pattern?

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  • 17.

    What design pattern may be violated by improper use of Dependency Injection and why?

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  • 18.

    Can you show how Dependency Injection can be used to implement a Singleton pattern properly?

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DI and Unit Testing


  • 19.

    How does Dependency Injection improve the testability of a class?

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  • 20.

    Explain how Dependency Injection facilitates the use of Mock objects in unit tests.

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  • 21.

    Can you describe a scenario where Dependency Injection made unit testing more challenging?

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Best Practices in DI


  • 22.

    What is constructor injection overuse, and why should it be avoided?

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  • 23.

    Describe an anti-pattern in Dependency Injection and how to resolve it.

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  • 24.

    What could be some potential pitfalls when using automatic wire-up features in DI frameworks?

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  • 25.

    How should developers manage the lifetime of dependencies provided by DI containers?

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Advanced Concepts in DI


  • 26.

    Explain the concept of Scoped Dependencies in Dependency Injection.

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  • 27.

    How does a Dependency Injection framework typically resolve circular dependencies?

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  • 28.

    What is meant by lazy loading of services in Dependency Injection and when is it useful?

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Dependency Injection in Microservices


  • 29.

    How does Dependency Injection support the scalability of microservices?

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  • 30.

    What role does a DI container play in orchestrating microservice dependencies?

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  • 31.

    How do you manage cross-service dependencies in microservices architecture with DI?

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DI in Specific Languages


  • 32.

    How is Dependency Injection implemented differently in statically-typed versus dynamically-typed languages?

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  • 33.

    Explain the concept of property injection in C# and where is it most suitable to use?

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  • 34.

    How do you perform dependency injection in a JavaScript application without a DI framework?

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Real-world Scenarios and Use Cases


  • 35.

    Can you describe a real-world problem that you solved using Dependency Injection and how it benefited the project?

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