Action Function
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Action Function
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this.setState from class components can also accept a function. So let's
add support for that with our simulated setState function. See if you can
figure out how to make your reducer support both the object as in the last step
as well as a function callback:const [state, setState] = useReducer(countReducer, {
count: initialCount,
})
const { count } = state
const increment = () =>
setState((currentState) => ({ count: currentState.count + step }))
const decrement = () =>
setState((currentState) => ({ count: currentState.count - step }))