/Javascript/React/UseReducer() hook react

UseReducer() hook react

Usereducer hook

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

UseReducer() hook react

code snippet 

https://codesandbox.io/s/usereducer-demo-zxguu?file=/src/App.js

Similar codes

0 vote214 views2 answers
React toastify dark mode
Javascript React
0 vote195 views1 answer
Mdn react
Javascript React
0 vote193 views1 answer
React-native-quick-scroll npm
Javascript React
0 vote217 views1 answer
Setting a date range using yup on react date picker
Javascript React
0 vote209 views1 answer
Svg as a component react
Javascript React
1 vote209 views1 answer
React native header
Javascript React
1 vote216 views1 answer
Reactjs change window name
Javascript React
63 votes249 views3 answers
Concat two arrays in react
Javascript React
-1 vote198 views1 answer
Import ReactDOM from "react-dom";
Javascript React
0 vote201 views1 answer
Simbu react1
Javascript React