How do you define a React component?

Components are the building blocks of any React app and a typical React app will have many of these. Simply put, a component is a JavaScript class or function that optionally accepts inputs i.e. properties(props) and returns a React element that describes how a section of the UI (User Interface) should appear.

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Why is React not good?

ReactJS components are difficult to reuse in complex interactive web projects . ReactJS’s Virtual DOM algorithm is time-consuming and imprecise. ReactJS’s HTML templates are neither complete nor powerful. ReactJS requires complicated asynchronous programming while communicating with the server.

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