useReducer Example

useReducerExample.js

import React , { useReducer } from 'react';

const initialState = {count: 0};
const yourReducer = (state, action) => {
  switch (action.type) {
    case 'reset':
      return initialState;
    case 'increment':
      return {count: state.count + 1};
    case 'decrement':
      return {count: state.count - 1};
  }
}
const MyCounter = props => {
  const [state, dispatch] = useReducer(yourReducer, initialState);
  return (
    <div>
      Count: {state.count}
      <button onClick={() => dispatch({type: 'reset'})}>Reset</button>
      <button onClick={() => dispatch({type: 'increment'})}>+</button>
      <button onClick={() => dispatch({type: 'decrement'})}>-</button>
    </div>
  );
}

export default MyCounter;