Full-Stack Developer Interview Questions and Answers for 2 years experience

1. What is the difference between == and === in JavaScript?

   • Answer: `==` performs loose equality, checking for value equality after type coercion. `===` performs strict equality, checking for both value and type equality without coercion. For example, `1 == "1"` is true, but `1 === "1"` is false.

2. Explain the concept of RESTful APIs.

   • Answer: REST (Representational State Transfer) is an architectural style for building web services. RESTful APIs use standard HTTP methods (GET, POST, PUT, DELETE) to interact with resources, identified by URIs. They are stateless, meaning each request contains all the information needed to process it, and they are client-server, separating concerns between the client and the server.

3. What are the benefits of using a version control system like Git?

   • Answer: Git allows for tracking changes to code over time, facilitating collaboration among developers. It enables branching and merging, enabling parallel development and experimentation. It provides a history of changes, allowing for easy rollback to previous versions if needed. It also supports distributed workflows, making it robust and flexible.

4. Describe your experience with a specific JavaScript framework (e.g., React, Angular, Vue.js).

   • Answer: (This answer will vary depending on the framework used. A good answer would include specific examples of projects, components built, and challenges overcome. Mention key features and concepts understood, like component lifecycle, state management, routing, and data binding.) For example: "I have extensive experience with React. I've used it to build several single-page applications, leveraging features like functional components, hooks (useState, useEffect), and Context API for state management. I'm familiar with routing libraries like React Router and have experience optimizing performance using techniques like memoization and code splitting."

5. How do you handle errors in your code?

   • Answer: I use a combination of techniques to handle errors, including try-catch blocks to catch exceptions, logging errors to the console or to a dedicated logging service for debugging, and implementing robust error handling in APIs to return informative error messages to the client. I also write unit and integration tests to identify and prevent errors early in the development process.

6. Explain the difference between SQL and NoSQL databases.

   • Answer: SQL databases (relational databases) use structured query language and store data in tables with rows and columns, enforcing relationships between data. NoSQL databases (non-relational databases) are more flexible and can handle various data models like document, key-value, graph, and wide-column stores. SQL databases are typically better for structured data requiring ACID properties (Atomicity, Consistency, Isolation, Durability), while NoSQL databases are suitable for large-scale, unstructured or semi-structured data and high scalability needs.

7. What is the purpose of a database index?

   • Answer: A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes and storage space to maintain the index data structure. Without an index, the database must perform a full table scan. Indexes significantly speed up queries by allowing the database to quickly locate specific rows without scanning the entire table.

8. What are some common HTTP status codes and their meanings?

   • Answer: 200 OK: Successful request. 201 Created: Successful request resulting in a new resource. 400 Bad Request: Client-side error. 401 Unauthorized: Requires authentication. 404 Not Found: Resource not found. 500 Internal Server Error: Server-side error.

Thank you for reading our blog post on 'Full-Stack Developer Interview Questions and Answers for 2 years experience'.We hope you found it informative and useful.Stay tuned for more insightful content!