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)

The store – combining actions and reducers

By now, we might be wondering what exactly Redux is (besides a set of principles and some helper functions). Essentially, Redux brings actions and reducers together. It provides a store, which contains the application state and provides some functions to do the following:

  • Access the application state: store.getState()
  • Dispatch actions: store.dispatch(action)
  • Register listeners: store.subscribe(listener)

According to the official documentation of Redux, Redux is a predictable state container for JavaScript apps.

The state container (store) is the heart of Redux: It contains your application state and does not allow external changes. Redux only allows changes through actions, which get passed to pure reducer functions. These restrictions that Redux enforces are what makes your application state predictable.