CODE EXAMPLE FOR JAVASCRIPT

usereducer

import React from "react";
import { useReducer } from "react";
const initialState = {
  count: 0,
};
type ReducerProps = {
  state: any;
};
const reducer = (state: state, action) => {
  switch (action.type) {
    case "increment":
      return { count: state.count + action.payload };
    case "decrement":
      return { count: state.count - action.payload };
    default:
      return state;
  }
};

const Counter = () => {
  const [state, dispatch] = useReducer(reducer, initialState);
  return (
    <div>
      Count : {state.count}
      <button
        onClick={() => {
          dispatch({ type: "increment", payload: 1 });
        }}
      >
        Increment ++
      </button>
      <button
        onClick={() => {
          dispatch({ type: "decrement", payload: 1 });
        }}
      >
        Decrement --
      </button>
    </div>
  );
};

export default Counter;