Complete Introduction to React Redux

//Complete Introduction to React Redux

Complete Introduction to React Redux

With so many web development tools and libraries available, it may not be a good idea to jump on every new one without fully understanding its merits or why you should use it. Redux isn’t a new concept, but it’s still trendy. In this article, we’ll go through what Redux is actually and how it works.

First, we’ll go through the fundamentals of Redux and how it works. Then we’ll look at how React Redux can help you with your project by utilizing a small yet valuable component.

What is Redux?

Redux is defined as a state container that allows you to develop JavaScript apps. These apps act consistently across client, server, and native contexts and are simple to test. Apart from state management tools, Redux may be used with any other JavaScript frameworks or libraries. You don’t have to worry about making your application’s asset size bigger becuase it’s lightweight at 2KB. Using Redux, the application state is kept in a store, and any component can access any state from this store whenever needed.

When to use Redux?

Redux has recently been one of the most heated disputes in the frontend community. React Redux quickly became one of the most hotly debated subjects. Many people supported it, while others pointed out flaws. It enables you to ma>nage your app’s state in a single location, making updates more predictable and traceable. It makes it easy to reason about changes in your app.

All of these advantages, however, come with compromises and restrictions. It may add boilerplate code, making basic operations seem more complicated; however, it’s dependent on the design decisions.

One easy answer to this question is that you will recognize when you require Redux. If you’re still confused if you need it, the answer is no. This generally occurs when your app has evolved to the point that managing the app state becomes a chore, and you begin searching for ways to make it easier and more accessible.

Also read: React 18 Features

How Redux Works?

How Redux Works

Redux is a basic application. The whole state of the application is kept in a central store. Without passing down props from one component to the next, each component can access the stored state. There are three types of building blocks: actions, stores, and reducers. Let’s have a quick look at each of them. This is important as it helps you grasp the benefits of React Redux and how to utilize it. We’ll use Redux to build a similar example to the login component above.

Actions in Redux

Simply put, actions are events. They are the only way to transfer data from your application to your Redux store. The data might come from user interactions, API requests, or even form submissions.

The store.dispatch() function is used to dispatch actions. Actions are simple JavaScript objects that must include a type property to specify the action to be performed. They must also include a payload containing the information that the action should work on. An action maker is used to create action

Here’s an example to explain the action during login:

type: “LOGIN”,
payload: {
username: “foo”,
password: “bar”
Here is an instance of its action creator:
const set LoginStatus = (name, password) => {
return {
type: “LOGIN”,
payload: {
username: “foo”,
password: “bar”

Reducers in Redux

Reducers take the applications current state, execute an action, and return a new form. These states are objects that describe how an application’s state changes in response to an action delivered to the store.

It is based on JavaScript’s reduction function, which calculates a single value from several values after executing a callback function.

Here is an example to show reducers working in Redux:

const LoginComponent = (state = initialState, action) =>
switch (action.type)

// This reducer control any action with type “LOGIN”
case “LOGIN”:
return => {
if (user.username !== action.username) {
return user;

if (user.password == action.password) {
return {
login_status: “LOGGED IN”
return state;

Store in Redux

The application state is stored in the store. In any Redux application, it is strongly advised to retain only one store. You can use helper methods to retrieve the saved state, change it, and register or unregister listeners.

Let’s make a store for our login app:

const store = createStore(LoginComponent);

Actions on the state always lead to a new state. Thus the state is relatively predictable and straightforward.

Now that we’ve understood a bit more about Redux let’s go to our earlier login component example and see how Redux can enhance it.

class App extends React.Component {
render() {
return ()

With Redux, there is just one general state in the store, and each component has access to it. This reduces the need to transfer form from one component to another continuously. You can also choose a slice from the store for a particular component, making your app more efficient.

Redux middleware

Redux in react js allows developers to grab all those actions which are dispatched by components. This is done before they are delivered to the reducer function. This interception is accomplished through the use of middleware.

Using the Login component from the previous section as an example, we might wish to sanitize the user’s input before it reaches our store for further processing. This is possible using the Redux middleware. Technically, the middleware calls the next method after processing the current action. This method received in an argument after processing the current action. These are named after each dispatch.

Here’s an example of a basic middleware:

function simpleMiddleware({ getState, dispatch }) {
return function(next){
return function(action){
// processing
const nextAction = next(action);
// read the next state
const state = getState();
// return the next action or you can dispatch any other action
return nextAction;

This may appear to be a difficult challenge. Still, in most situations, you may not need to develop your middleware since the large Redux community has already made a number of them available. If you believe middleware is necessary, you will appreciate it since it provides you with the power to perform excellent work with the most acceptable abstraction.

Read about: Best React libraries in 2021

Why use Redux?

States will no longer need to be lifted when utilizing Redux in React. This makes it easy to determine which activity results in a change.

As seen in the preceding example, the component does not need to offer any state or mechanism for its children components to communicate data among themselves. Redux is in charge of everything. This substantially simplifies the app and makes it easier to maintain.

This is the major reason to utilize Redux in the mobile app development services, but it is not the only benefit. Take a look at the list below to overview the benefits of using Redux for state management.

Redux makes the State Predictable

Redux ensures a constant state. Because reducers are pure functions, if the same state and action are provided, the same result is always produced. The status is also permanent and never changes. This enables complex tasks such as infinite to undo and redo to be implemented. It is also feasible to create time travel or the capacity to move back and forth between prior states and see the effects in real-time.

Redux is Maintainable

Redux is very strict about code arrangement, making it easy for someone with Redux knowledge to grasp the structure of any Redux application. In general, this makes it easy to maintain. This also aids in the separation of your business logic from your component tree. Large-scale apps need to keep your app predictable and maintained.

Debugging is easy in Redux

React Redux simplifies application debugging. It is simple to understand code mistakes, network failures, and other bugs during production by recording actions and states. It also offers excellent DevTools that enable you to time-travel activities, persist actions on page refresh, and many more. Debugging takes longer than developing features in medium and large-scale programs. Redux DevTools makes it simple to take advantage of all Redux has to offer.

Performance Benefits

You would think that keeping the app’s state global would degrade performance. React Redux provides several performance optimizations internally, ensuring that your linked component renders only when necessary.

Server-side Rendering

Redux can also be used for server-side rendering commonly known as SSR. It allows you to manage the app’s first render by providing the app’s state to the server and its response to the server request. The required components are subsequently produced in HTML and delivered to the customers.


In this article, we have discussed the essential features of redux and why it’s useful to your app. This does not mean that you should add Redux to all of your applications, even if it does have its benefits. Your application may still work well without Redux.

One significant advantage of Redux is that it adds direction to decouple “what happened” from “how things evolve.” However, you should only use Redux if your project requires a state management tool. Connect with us to hire a react developer for your business.

By | 2021-09-29T09:12:45+00:00 September 29th, 2021|React Native App|0 Comments