/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 vote123 views1 answer
Dropzone react view photo
Javascript React
41 votes97 views4 answers
On click copy to clipboard react
Javascript React
0 vote125 views1 answer
Export app react native
Javascript React
0 vote129 views1 answer
React tagInput component
Javascript React
0 vote133 views1 answer
Open close children modal react
Javascript React
8 votes116 views4 answers
Props react
Javascript React
1 vote138 views1 answer
React native scrollview sticky header
Javascript React
0 vote227 views1 answer
How to run electron and react using concurrently
Javascript React
0 vote186 views1 answer
Toggle function react js
Javascript React
0 vote118 views1 answer
Toggle boolean state react
Javascript React