/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

0 vote100 views1 answer
React icons cdn
Javascript React
1 vote154 views1 answer
Share file in react native
Javascript React
41 votes153 views5 answers
UseRef() in react
Javascript React
0 vote170 views1 answer
React router link electron not working
Javascript React
0 vote144 views1 answer
How to prevent previous radio button active react native
Javascript React
2 votes103 views1 answer
Yarn create react-app test00h00m00s 0/0: : ERROR: [Errno 2] No such file or directory: 'create'
Javascript React
8 votes139 views4 answers
Props react
Javascript React
21 votes152 views4 answers
React font awesome npm
Javascript React
0 vote159 views1 answer
React tutorial componentDidMount() componentWillUnmount()
Javascript React
1 vote139 views1 answer
React js component parameters
Javascript React