Calculator in react using redux

I created a calculator in react. Now I would like to use the global instead of the local state - I know that this solution may not have a larger session, but I want to learn redux in this way. I prepared the action and the reducer. I don’t know how to pass the values - I get an error with a non-existent result variable.
Link to application with local status:


Link to application with redux:

Code: index.js

Blockquote

import React from "react";
import { render } from "react-dom";
import { createStore } from "redux";
import { Provider } from "react-redux";
import App from "./components/App";
import calculate from "./reducers";

const store = createStore(calculate);

render(
  <Provider store={store}>
    <App />
  </Provider>,
  document.getElementById("root")
);

reducer - index.js

Blockquote

const calculate = (state, action) => {
  switch (action.type) {
    case "ADD_TO_MEMORY":
      result += id;
      return result;

    case "ADD":
      result = parseFloat(result) + parseFloat(prev);
      return result;

    default:
      return result;
  }
};

export default calculate;

action - index.js

Blockquote

let prev = "";
let result = "";
let current = "";
let disabled = true;

export const addToMemory = id => ({
  type: "ADD_TO_MEMORY",
  result: result
});

export const add = result => ({
  type: "ADD",
  result: result
});

App.js

Blockquote

let prev = "";
let result = "";
let current = "";
let disabled = true;

export const addToMemory = id => ({
  type: "ADD_TO_MEMORY",
  result: result
});

export const add = result => ({
  type: "ADD",
  result: result
});

Counter.js

Blockquote

import React from "react";
import { connect } from "react-redux";
import { addToMemory, add } from "../actions/index";

const Counter = ({ dispatch, result }) => {
  return (
    <p>
      <button id="1" onClick={addToMemory("1")}>
        1
      </button>
      <button id="1" onClick={addToMemory("2")}>
        2
      </button>
      <button id="1" onClick={addToMemory("3")}>
        3
      </button>
      <button id="1" onClick={addToMemory("4")}>
        4
      </button>
      <button id="1" onClick={addToMemory("5")}>
        5
      </button>
      <button id="1" onClick={addToMemory("6")}>
        6
      </button>
      <button id="1" onClick={addToMemory("7")}>
        7
      </button>
      <button id="1" onClick={addToMemory("8")}>
        8
      </button>
      <button id="1" onClick={addToMemory("9")}>
        9
      </button>
      <button id="1" onClick={addToMemory("0")}>
        0
      </button>
      <p>RESULT: {result}</p>
    </p>
  );
};

export default connect()(Counter);