An unforgettable way to Learn Redux 👉 👉 👉 https://medium.com/@ohansemmanuel/an-unforgettable-way-to-learn-redux-the-visual-guide-f36afd38c966

unforgettable-way-to-learn-redux.js

// An example of an action 
const action = { 
  type: "WITHDRAW_MONEY",
  amount: "$10,000"
}

// A basic reducer. Takes in two parameters: state, and action. 
const reducer = (state, action) => {
  return state;
};


// How to create a Store 
import { createStore } from "redux"; //an import from the redux lib
import reducer from "./reducers" 

const store = createStore(reducer);

//Never mutate the state that comes into the reducer. This is WRONG!
const reducer =  (state=[], action) => {
  return state.push('new value');
};

//This is RIGHT!
const reducer = (state=[], action) => {
  return [...state, 'new value']
};