Redux

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February 20, 2023

12:48 pm

638 Comments on Redux

Javascript

npm install react-redux @reduxjs/toolkit

counterSlice.js

import { createSlice } from "@reduxjs/toolkit";

const initialState = {
  count: 0,
};

const counterSlice = createSlice({
  name: "counter",
  initialState,
  reducers: {
    increment: (state) => {
      state.count += 1;   // immer allows mutation
    },
    decrement: (state) => {
      state.count -= 1;
    },
  },
});

export const { increment, decrement } = counterSlice.actions;
export default counterSlice.reducer;

store.jsx

import { configureStore } from "@reduxjs/toolkit";
import counterReducer from "./counterSlice";

const store = configureStore({
  reducer: {
    counter: counterReducer,
  },
});

export default store;

main.jsx

import { StrictMode } from 'react'
import { createRoot } from 'react-dom/client'
import './index.css'
import App from './App.jsx'
import { Provider } from 'react-redux'
import store from './store.js'

createRoot(document.getElementById('root')).render(
  <StrictMode>
    <Provider store={store}> {/* Wrap your App inside Provider */}
    <App />
    </Provider>
  </StrictMode>,
)

App.jsx

import { useSelector, useDispatch } from "react-redux";
import { increment, decrement } from "./counterSlice";

function App() {
  const count = useSelector((state) => state.counter.count);
  const dispatch = useDispatch();

  return (
    <>
      <button onClick={() => dispatch(increment())}>+</button>
      <button onClick={() => dispatch(decrement())}>-</button>
      <h1>{count}</h1>
    </>
  );
}

export default App;

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