Revert State On Request Failure using React setState and Closures

Erik Aybar
InstructorErik Aybar

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A crucial part of implementing optimistic UI updates is properly handling failure cases. In the event of a request failing, we must revert the state which we’ve already updated since we assumed success at the time of user interaction. Thanks to the simplicity and power of setState() combined with Javascript's lexical scoping and closures, we can accomplish this relatively easily in React.