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`useReducer` helps us to manage mutiple states. It manages every state within a central place.To understand `useReducer`, I like to think about it as different people having different responsibilities.
Normally, all state updates in React are urgent. If you click a button or type in an input and it triggers a slow render, the browser freezes until the render is complete. useTransition fixes this by making updates "non-urgent" (interruptible).
React automatically memoizes fetch() GET requests during a render. This means that if the same fetch() request is made multiple times with the same arguments within the same render, React performs the network request only once and reuses the result for subsequent calls.