React Senior Developer Preparation Test Part 1

What is React, and what are its key benefits?

What is the difference between a React Node, React Element, and a React Component?

What is JSX and how does it work in React?

What is the difference between state and props in React?

What is the purpose of the key prop in React lists?

What are the consequences of using array indices as keys in React lists?

What is the difference between controlled and uncontrolled React components?

What are some common pitfalls of using context in React?

What are the benefits of using React hooks?

What are the rules of React hooks?

What is the difference between useEffect and useLayoutEffect in React?

What is the purpose of the functional callback form of setState in React, and when should it be used?

What does the dependency array of useEffect control?

What is the primary reason React uses a virtual DOM during re-rendering?

Which React feature allows grouping multiple elements without adding extra nodes to the DOM?

Before React 19, why was forwardRef() commonly used in function components?

How can you force a React component to reset its internal state completely?

Why is mutating state directly discouraged in React?

What method do error boundaries in React use to render fallback UI after an error is caught?

Which of the following React components can act as an error boundary?

Which testing tools are recommended for testing React components effectively?

What advantage does React Testing Library offer over fireEvent for user interactions?

How can you mock network requests effectively while testing React applications?

What new root-level options were introduced in React 19 to handle errors globally?

Which syntax can be used as a shorthand to declare React Fragments?

In React, what is the consequence of mutating state directly on hooks like useState or useReducer?

What is the recommended way to reset specific parts of a component's state when using useReducer?