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



If we were to build our own middleware implementation, we would probably want the ability to run code both before an action is passed to the reducers and after. One approach would be to define two different callbacks for before and after.



Redux middleware takes a different approach and gives us the `next()` function. Calling it with an action will cause it to propagate down the middleware chain, calling the root reducer and updating the store's state. This allows us to add code before and after passing the action to the reducers:

~~~~~~~
const logMiddleware => ({ getState, dispatch }) => next => action => {
  console.log("Before reducers have run");
  next(action);
  console.log("After reducers have run");
};
~~~~~~~

This nifty trick gives us more power than might initially be apparent. Since we are responsible for calling `next()` and passing it the action, we can choose to suppress `next()` in certain conditions or even modify the current action before passing it on. 

>Failing to call `next(action)` inside a middleware will prevent the action from reaching the other middleware and reducers.


Let's look at how next() can be used to allow running code before and after passing an action to the reducer.

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

Next()