/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 vote100 views1 answer
Remove an item from a component in react
Javascript React
0 vote132 views2 answers
.env file example react native
Javascript React
3 votes174 views1 answer
React create array
Javascript React
13 votes169 views3 answers
React native conditional rendering
Javascript React
4 votes137 views3 answers
Reactjs date format dd/mm/yyyy
Javascript React
0 vote124 views1 answer
The email address is badly formatted react
Javascript React
2 votes120 views1 answer
How to make react router Link active
Javascript React
32 votes141 views1 answer
How to use routes in react js
Javascript React
0 vote128 views1 answer
ReactRender
Javascript React
2 votes130 views1 answer
Property 'target' does not exist on type 'string' react
Javascript React