/Javascript/React/Reducer in react example

Reducer in react example

const initialState = {count: 0};

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

function Counter() {
  const [state, dispatch] = useReducer(reducer, initialState);
  return (
    <>
      Count: {state.count}
      <button onClick={() => dispatch({type: 'decrement'})}>-</button>
      <button onClick={() => dispatch({type: 'increment'})}>+</button>
    </>
  );
}

Source: reactjs.org

Similar codes

-1 vote94 views1 answer
How to retrieve filename from a blob response in react js
Javascript React
3 votes190 views3 answers
How to uninstall react native cli globally
Javascript React
1 vote91 views1 answer
Mui modal backdrop
Javascript React
0 vote123 views1 answer
Formdata append react js
Javascript React
1 vote127 views1 answer
React lottie player on hover
Javascript React
0 vote126 views1 answer
How to write unit test cases in react js
Javascript React
1 vote125 views1 answer
Convert nuber into string react js
Javascript React
4 votes138 views1 answer
Open a new tab when clicking on a link react
Javascript React
0 vote118 views1 answer
To do list app react code
Javascript React
0 vote143 views1 answer
React check if array contains value
Javascript React