React.js, often simply called React, is a highly popular JavaScript library for building user interfaces. Developed and maintained by Facebook, React is renowned for its component-based architecture and the ability to efficiently update and render components when data changes. It is a foundational tool for developing modern web and mobile applications, allowing developers to create dynamic and interactive user interfaces with ease. React's vast ecosystem, including tools like React Native for mobile app development, makes it a top choice for frontend development and a key player in the world of web technologies.
61. What is React state management primarily used for?
Answer:Managing application state
62. Which built-in method in a React class component is used to initialize the component's state?
Answer:constructor
63. In React, which method is used to update the component's state and trigger a re-render?
Answer:setState
64. What is the primary benefit of using state management libraries like Redux in a React application?
Answer:Centralizing and managing application state
65. In a functional component, how do you manage state using React Hooks?
Answer:By using the useState Hook
66. What is the purpose of the useReducer Hook in React state management?
Answer:To manage complex state logic
67. Which of the following is NOT a common state management library for React?
Answer:GraphQL
68. What is the main principle behind "unidirectional data flow" in React state management?
Answer:Data flows from components to a central store
69. In Redux, what is the central component responsible for managing the application state?
Answer:Store
70. Which Redux function is used to dispatch actions to update the state in a Redux store?
