How else can state be updated in React (through a function with the previous value)?

In React, to update the state considering the previous value, it is common to use a function in setState or in the useState hook.

Besides the classic approach:

setState(prevState => ({ count: prevState.count + 1 }));

there are other ways to update, for example:

• Using an update function in functional components with the useState hook:

const [count, setCount] = useState(0);

setCount(prevCount => prevCount + 1);

• In useReducer, you can update the state through a reducer that receives the current state and an action:

function reducer(state, action) {
  switch(action.type) {
    case 'increment':
      return { count: state.count + 1 };
    default:
      return state;
  }
}

const [state, dispatch] = useReducer(reducer, { count: 0 });
dispatch({ type: 'increment' });

• In class components, you can use a callback in setState to access the previous state:

this.setState((prevState) => ({ count: prevState.count + 1 }));

Thus, updating via a function with the previous value is the standard and recommended way, especially when the new state depends on the old one, to avoid issues with asynchronous updates.