What is the concept of dividing the user interface and functional programming in Reactjs?

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The concept of dividing the user interface and functional programming in Reactjs is based on the idea of separating the presentation or representation of a web page or application from the logic or functionality of that page or application. Reactjs provides a way to create reusable components that can be used to define the UI of a web page or application, and these components can be composed together to create complex user interfaces. At the same time, Reactjs also provides a way to define the functionality of these components using functional programming principles. By separating the UI and functionality in this way, it becomes easier to maintain, test and reuse the code, and also makes it possible to create more modular, scalable and efficient web applications.