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



Let's start by looking at a server communication implementation with async action creators using the `redux-thunk` library to understand the underlying pitfalls of this approach:

```
const fetchUser = id => dispatch =>
  axios.get(`http://api.ourserver.com/user/${id}`)
    .then(({ data: userData }) => dispatch(setUserData(userData)));
```

Consider another example where we would like to fetch a list of comments for a user:

~~~~~~~
const fetchComments = id => dispatch =>
  axios.get(`http://api.ourserver.com/user/${id}/comments`)
    .then(({ data: commentsData }) => dispatch(setComments(commentsData)));
~~~~~~~

Even without the more complex functionality mentioned earlier, the code contains many duplications between action creators. And there are a few other problematic issues:

- We can't log actions before the network request completes, preventing the regular Redux debug flow.
- Every action creator has repetitive functionality for handling errors and setting headers.
- Testing gets more challenging as more async action creators are added.
- If we want to change the server communication strategy (e.g., replace `axios` with `superagent`), we need to change multiple places in the codebase.






Let's start by looking at a server communication implementation with async action creators using the `redux-thunk` library to understand the underlying pitfalls of this approach:

```
const fetchUser = id => dispatch =>
  axios.get(`http://api.ourserver.com/user/＄{id}`)
    .then(({ data: userData }) => dispatch(setUserData(userData)));
```

Consider another example where we would like to fetch a list of comments for a user:

~~~~~~~
const fetchComments = id => dispatch =>
  axios.get(`http://api.ourserver.com/user/＄{id}/comments`)
    .then(({ data: commentsData }) => dispatch(setComments(commentsData)));
~~~~~~~

Even without the more complex functionality mentioned earlier, the code contains many duplications between action creators. And there are a few other problematic issues:

- We can't log actions before the network request completes, preventing the regular Redux debug flow.
- Every action creator has repetitive functionality for handling errors and setting headers.
- Testing gets more challenging as more async action creators are added.
- If we want to change the server communication strategy (e.g., replace `axios` with `superagent`), we need to change multiple places in the codebase.




Learn about the async action creators in server communication.

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

Asynchronous Action Creators