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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:

What happens after an action is dispatched?

Select the correct answer

Everything was clear?

Section 2. Chapter 6
course content

Course Content

Introduction to Redux

Introduction to Redux

1. Getting Started

What is Redux?Why Redux? When to use Redux?Setting up a React-Redux Application

2. Fundamental Concepts

Redux ActionsRedux ReducersRedux StoreStore Dispatch MethodSelectorsRedux Data Flow

3. Redux in Practice

Redux Application Structure Modifying the Template for UseCreating the Redux StoreRedux SliceCreating a SliceUnderstanding SliceUsing Selectors to access StateModifying State by Dispatching ActionsThunk FunctionsRules for ReducersUnderstanding the Counter Application

4. Creating a React-Redux Application

The ApplicationSetting Up the ApplicationCreating the UI SkeletonCreating the Profile SliceCreating the Posts SliceCompleting the Posts featureDisplaying Number of Posts and UsersAdding CSS Styling

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:

What happens after an action is dispatched?

Select the correct answer

Everything was clear?

Section 2. Chapter 6
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