Understanding React

React is a library developed by Facebook, designed to efficiently render dynamic content on a page using a virtual DOM. React lets us pretend that the entire page is redrawn any time our application's state changes. As a page author, we write functions that take data and return DOM elements. React renders the DOM elements on the page. Importantly, when the data changes, React efficiently diffs the page and re-renders only the parts that have changed. Diffing is essential because re-rendering the entire page is prohibitively expensive on even moderately complex pages. React is an improvement over previous attempts at solving the problem because there's no need to specify data bindings or watchers. We just describe how to render ...

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