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


**Observable** allows libraries like #key# RxJS: library for composing asynchronous and event-based programs by using observable sequences #key# to subscribe to the store’s state changes. 
This subscription method is different from the regular `subscribe()` method of the store: when subscribing to the store as an `Observable`, the latest state is passed without the need to call `store.getState()`.

> Redux uses the `symbol-observable` #key# polyfill: It is used to implement features on browsers that do not have support for that feature #key# to support older browsers when `Symbol.observable` is not natively supported.

Here’s how we can integrate with RxJS:
~~~~~~~
import store from "store";
import { Observable } from "rxjs";

const store$ = Observable.from(store);

store$.forEach((state) => console.log(state))
~~~~~~~

This basic API is interoperable with the most common Reactive libraries. Any library that exports the `next()` method can subscribe and receive updates.

If you don’t use Reactive libraries, you can still subscribe to the store by accessing the `Symbol.observable` property:

~~~~~~
const observable = store[Symbol.observable]();
~~~~~~

Subscribing with a generic observer will cause the observer's `next()` method to be called on every state change and passed the current store state:


~~~~~~
const observer = {
  next(state) {
    console.log("State change", state);
  }
};

const observable = store.$$observable();

const unsubscribe = observable.subscribe(observer);
~~~~~~
To unsubscribe, we simply call the function returned from the call to `subscribe()`:
~~~~~~~
const observable = store[Symbol.observable]();
const unsubscribe = observable.subscribe(observer);

unsubscribe();
~~~~~~~

Learn about Observable and how the store works with it.

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

Store as Observable