Gain insights into Redux, an open-source library for managing app state. Learn about Redux store creation, middleware, state management, error handling, testing, and building robust applications.

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Redux

In this course, you will take a deep dive into Redux, an open-source JavaScript library for managing application state.

You will start by running through what Redux is, general concepts, and basic implementation. With the basics out of the way, you will begin working on building a recipe book application, adding more bells and whistles to it as the course progresses. You will learn to create a Redux store, how to work with middleware, state management, error handling, testing, and a whole lot more.

By the end, you will have advanced knowledge of one the most popular libraries among React and Angular developers. You will have the skills to create highly performant and consistent.

The Ultimate Guide to Redux

## Accessing the state
The `getState()` method returns the reference to the current state:

~~~~~~~
store.getState();
// => { recipes: [], ingredients: [] }
~~~~~~~

### Changing the state
Redux does not allow external changes to the state. Using the state object received from `getState()` and directly changing values  is **prohibited**. The only way to cause a change of the state is to pass actions to the reducer function, which updates the result used as the new global state.

Sending action objects to reducers is done via the store using the store’s `dispatch()` method, which accepts a single argument, the action object:


~~~~~~~
const action = { type: 'ADD_RECIPE', ... }
store.dispatch(action);
~~~~~~~

Now we can rewrite our reducer to make it able to create an updated state for actions of type `'ADD_RECIPE'` and return the current state otherwise:

~~~~~~~
const reducer = (state, action) => {
  switch (action.type) {
    case 'ADD_RECIPE':
      return Object.assign(...);
    default:
      return state;
    }
  };
~~~~~~~


# Accessing the state
The `getState()` method returns the reference to the current state:

~~~~~~~
store.getState();
// => { recipes: [], ingredients: [] }
~~~~~~~

## Changing the state
Redux does not allow external changes to the state. Using the state object received from `getState()` and directly changing values  is **prohibited**. The only way to cause a change of the state is to pass actions to the reducer function, which updates the result used as the new global state.

Sending action objects to reducers is done via the store using the store’s `dispatch()` method, which accepts a single argument, the action object:


~~~~~~~
const action = { type: 'ADD_RECIPE', ... }
store.dispatch(action);
~~~~~~~

Now we can rewrite our reducer to make it able to create an updated state for actions of type `'ADD_RECIPE'` and return the current state otherwise:

~~~~~~~
const reducer = (state, action) => {
  switch (action.type) {
    case 'ADD_RECIPE':
      return Object.assign(...);
    default:
      return state;
    }
  };
~~~~~~~


Learn how to access and change the store.

Introduction to Redux

Basic Redux Implementation

Cloning a Redux Boilerplate

Complete Redux Project

Creating a Store

Decorating the Store

Actions and Action Creators

Redux Thunk

Redux-Actions Library

Reducers

Avoiding Mutations

Introduction to Middleware

Your First Middleware

Middleware

State Management

Keeping a Normalized State

Persistence State

Real-World State

Server Communication

Moving Code from Action Creators

Error Handling

Server Communication II

Transforming Data

Chaining Requests

Managing Side Effects

Messaging Patterns

WebSockets

WebSocket Authentication

Testing

Testing Action Creators

Async Action Creators

Testing Reducers

Testing Middleware

Testing Async Middleware

Integration Tests

Evolution Of Redux

Final Assessment

Accessing and Changing the Store

Accessing the state

Changing the state