Introduction to Redux

Introduction to Redux

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1. Getting Started

In this section we will learn what Redux is, why it is useful, and most importantly when it is useful. We will also learn how to set up a basic react-redux application.

When to use Redux?

Setting up a React-Redux Application

2. Fundamental Concepts

In this section we will go through the fundamental concepts of Redux that are necessary to understand the workings of a Redux application. We will use code examples to understand the concepts and in the following section we will use them practically.

Store Dispatch Method

Redux Data Flow

3. Redux in Practice

In the previous section we looked at the basic concepts. In this section we use those basic concepts to understand some more complicated concepts and the structure of a Redux application. In the end we will also look at the Counter application to put together all the pieces of our knowledge together.

Redux Application Structure

Modifying the Template for Use

Creating the Redux Store

Creating a Slice

Understanding Slice

Using Selectors to access State

Modifying State by Dispatching Actions

Thunk Functions

Rules for Reducers

Understanding the Counter Application

4. Creating a React-Redux Application

This chapter is focused on practice hence we will utilize the knowledge we acquired in previous sections to create a practical application using Redux along with React.

The Application

Setting Up the Application

Creating the UI Skeleton

Creating the Profile Slice

Creating the Posts Slice

Completing the Posts feature

Displaying Number of Posts and Users

Adding CSS Styling

Course Content

Introduction to Redux

Redux Data Flow

As mentioned before, the data in Redux flows in a single direction. This simplicity makes the application easier to debug and less prone to errors.

When the application starts, the following happens:

Redux store is created with an initial value;
UI is rendered based on the initial state.

Then the following cycle continues based on changes in the application:

User acts such as clicking a button or submitting a form;
A relevant action is dispatched using the dispatch method based on the user's activity. For example, posts/createPost;
The store executes the reducer function inputting the received action and creates a duplicate state object using the old state object. It modifies the duplicate state object based on the current action (for example, incrementing the old value by an amount) and returns the new state object;
The store takes the value of that new state object;
All the associated elements are updated based on the state changes.

Now, this diagram might make more sense:

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Section 2. Chapter 6

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