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    Optimistic UI update in React using setState()

    In this lesson we will refactor an existing UI update from a typical loading approach to an optimistic UI update approach to give our users a faster, more snappy experience. Instead of displaying a "loading" UI to our users while our request is in progress, we will immediately update the UI and account for reverting state and displaying an error in the event of a failure. We can accomplish this relatively easily in React, thanks to the simplicity and power of setState() combined with making use of Javascript's lexical scoping and closures.

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