/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 vote193 views1 answer
React load after scrolling
Javascript React
1 vote192 views3 answers
React native SafeAreaView
Javascript React
0 vote507 views1 answer
React navigation 4
Javascript React
11 votes191 views5 answers
React router refresh page
Javascript React
0 vote195 views1 answer
How to clear form fields in react after submit
Javascript React
0 vote181 views1 answer
React Native Segmented Control Tab
Javascript React
0 vote253 views1 answer
React Cache buster
Javascript React
13 votes174 views1 answer
React making post request
Javascript React
65 votes205 views6 answers
React routing
Javascript React
0 vote188 views1 answer
The email address is badly formatted react
Javascript React