Book Image

Learning Redux

By : Daniel Bugl
Book Image

Learning Redux

By: Daniel Bugl

Overview of this book

The book starts with a short introduction to the principles and the ecosystem of Redux, then moves on to show how to implement the basic elements of Redux and put them together. Afterward, you are going to learn how to integrate Redux with other frameworks, such as React and Angular. Along the way, you are going to develop a blog application. To practice developing growing applications with Redux, we are going to start from nothing and keep adding features to our application throughout the book. You are going to learn how to integrate and use Redux DevTools to debug applications, and access external APIs with Redux. You are also going to get acquainted with writing tests for all elements of a Redux application. Furthermore, we are going to cover important concepts in web development, such as routing, user authentication, and communication with a backend server After explaining how to use Redux and how powerful its ecosystem can be, the book teaches you how to make your own abstractions on top of Redux, such as higher-order reducers and middleware. By the end of the book, you are going to be able to develop and maintain Redux applications with ease. In addition to learning about Redux, you are going be familiar with its ecosystem, and learn a lot about JavaScript itself, including best practices and patterns.
Table of Contents (13 chapters)

Implementing reducers

In the first chapter, we learned about reducers, functions that take the current state and an action and return the new state of the application. As you now know, actions only describe what happened. Reducers use that information to compute the new state.

To be able to figure out state changes, we should first think about the state of our application. We have already done this in the first chapter, and our state looks as follows:

posts: [
{ user: 'dan', category: 'hello', text: 'Hello World!' },
{ user: 'des', category: 'welcome', text: 'Welcome to the blog' }
filter: 'hello'

As you can see, we have two separate sub-states in the main state object: posts and filter. This is a good hint for making two reducers: a postsReducer to handle the posts sub-state, and a filterReducer...