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

Because `action creators` are nothing more than plain JavaScript functions which require only constants and do  not rely on state, they are very easy to test. Given the same input, they will always return the same output. `Action creators` also never modify any state directly but rather only return a new object. Thus, our tests can pass input values to action creators and verify that the correct object is returned for each case:


~~~~~~~
import { ADD_RECIPE } from 'constants/actionTypes';
import { addRecipe } from 'actions/recipes';

describe('actions/recipes', () => {
  it ('addRecipe', () => {
    const title = 'Omelette';
    const description = 'Fast and simple';
    const expectedAction = {
      type: ADD_RECIPE,
      title,
      description
    };

    expect(addRecipe(title, description)).to.equal(expectedAction);
  });

  it ('addRecipe with default title', () => {
    const description = 'Fast and simple';
    const expectedAction = {
      type: ADD_RECIPE,
      title: 'Untitled',
      description
    };

    expect(addRecipe(null, description)).to.equal(expectedAction);
  });
});
~~~~~~~
You must have `jest` installed. You can run the command by typing:

```
npm test
```
> More complex action creators might use helper functions to build the action object. E.g, a `SET_TITLE` action uses function `trimTitle()`, removes whitespace from around a string. We would test the method separately from the action creator function itself, verifying that the action creator called that method and passed it the needed parameters.


Learn how to test the action creators in Redux.

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

Testing Action Creators