/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

31 votes192 views1 answer
Npm install react-router-dom --save
Javascript React
2 votes313 views1 answer
Get current screen name react navigation
Javascript React
0 vote152 views1 answer
ReactNative onPress doesn't exist
Javascript React
0 vote191 views1 answer
React build size
Javascript React
0 vote203 views1 answer
Camera roll react native
Javascript React
0 vote190 views1 answer
Disable key enter react-hook-form
Javascript React
0 vote229 views2 answers
How to convert time to users timezone in react
Javascript React
1 vote189 views1 answer
Column width table react
Javascript React
18 votes245 views6 answers
Import svg as react component
Javascript React
0 vote212 views1 answer
React native make safe view in mobile
Javascript React