Developers & Programmers Interview

Interview Question:

Can you explain the key differences between class components and functional components in React? When would you choose one over the other?

Candidate's Answer:

Small scale application they used glasses so we actually

AI Evaluation:

Your answer seems to have been a bit unclear and incomplete. You mentioned "small scale application they used glasses so we actually," which does not directly address the question about the differences between class components and functional components in React.

To improve your answer, you should focus on the following points:

1. Key Differences:
- Syntax: Class components use ES6 class syntax, while functional components are simply JavaScript functions.
- State Management: Class components have the ability to maintain internal state and lifecycle methods while functional components relied on props and were stateless until React hooks were introduced.
- Lifecycle Methods: Class components provide lifecycle methods (e.g., `componentDidMount`, `componentDidUpdate`), whereas functional components use the `useEffect` hook for side effects.
- Performance: Functional components can be more optimized and easier to test compared to class components.

2. When to Use:
- Class Components: Traditionally, they were used for complex components that required state and lifecycle methods. However, they are becoming less common with the introduction of hooks.
- Functional Components: They are preferred for most new development, especially for simpler components and when you want to leverage hooks for state and effects. They tend to lead to cleaner and more concise code.

Your answer might rate around 1/5 due to its lack of clarity and completeness. A thoughtful response detailing these aspects, perhaps with examples of when to use each type, would create a stronger impression in an interview. Aim to ensure that your answers are clear, comprehensive, and relevant to the question asked in an interview.