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About React
React is a JavaScript library for creating User Interface. React reacts when any data change happens in the application or website. When a website or application loads React create a copy of the real DOM which is called virtual DOM and wait for any change(State) in the real DOM. When any change in the State happens React again create another virtual DOM and compares that virtual DOM with the previous one and only changes or renders that specific part of the real DOM. Which helps the users optimized browsing experience without loading all the content over and over.React is a Component base library. In React properties in short Props helps to pass data from one Component to its Child Components. Props are immutable which means they can't be changed inside Child Components. State: In
React State is used when a component needs to keep track of data between renderings. By default Components has no State. We need to use useState inside Component to start tracking the renders. State are mutable, asynchronous and it needs a callback function to keep track of the previous State.useState is a hook used in React to allow state variable to pass in functional components. While using useState a initial state is initialized and function is called to change the state. The initial value will be assigned only on the initial render. If it is a function, it will be executed only on the initial render.