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


A common point of confusion is the difference between the `next()` and `dispatch()` functions passed to the middleware. While both accept an action, they follow different flows in Redux.



Calling `next()` within a middleware will pass the action along the middleware chain (from the current middleware) down to the reducer. Calling `dispatch()` will start the action flow from the beginning (the first middleware in the chain), eventually reaching the current one. Suppose we have the following middleware:


~~~~~~~
createStore(reducer,
  applyMiddleware(middlewareA, middlewareB, middlewareC)
);
~~~~~~~

Calling `next(action)` within `middlewareB` results in calls to `middlewareC` and the reducer.

Calling `dispatch(action)` within `middlewareB` results in calls to `middlewareA`, `middlewareB`, `middlewareC`, and the reducer.

Calling `dispatch()` multiple times is a common and valid practice. `next()` can also be called more than once. However, we do not recommend this mode, as any action passed to `next()` will skip the middleware before the current one (for example, potentially skipping the logging middleware).

Learn the difference between next() and dispatch().



The Difference Between next() and dispatch()


Learn the difference between next() and dispatch().

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

The Difference Between next() and dispatch()