/Javascript/React/React usestate functional update

React usestate functional update

() => setCount(prevCount => prevCount - 1)

Source: reactjs.org

Update state in useState hook

// declare state using useState hook.
// someState is set to someInitialState
const [someState, setSomeState] = useState(someInitialState);

// setSomeState updates the current state 
setSomeState(someOtherState);

Source: reactjs.org

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