Once you have installed the needed dependencies, create a new “slice” using the createSlice function. A slice is a portion of the Redux store that is responsible for managing a specific piece of state. Finally, it’s important to note that an application’s state is stored in memory when using Redux. Therefore, the state will be lost if a user refreshes the page or navigates away from the app.

You might assume that keeping the app’s state global would result in some performance degradation. React Redux implements many performance optimizations internally so that your own connected component only re-renders when it actually needs to. When using Redux with React, states will no longer need to be lifted what is redux and why it matters up. This makes it easier for you to trace which action causes any change. With that in place, let’s now move to learning about what Redux middleware are and how they can further simplify the overall experience. We’ll be implementing a similar example to the login component above but this time in Redux.

Redux Terms and Concepts​

There can either be one reducer if it is a simple app or multiple reducers taking care of different parts or slices of the global state in a bigger application. The state of the whole application is stored in the form of a JS object tree in a single store as shown below. What makes Redux predictable is that to make a change in the state of the application, we need to dispatch an action which describes what changes we want to make in the state. Based on the type of the action, we either need to return a brand-new object to
be the new state result, or return the existing state object if nothing should change.

While Redux has many helpful features, that does not mean you should add Redux to all of your apps. With it, you can handle the initial render of the app by sending the state of an app to the server along with its response to the server request. The required components are then rendered in HTML and sent to the clients. For medium- and large-scale apps, debugging takes more time then actually developing features. Redux DevTools makes it easy to take advantage of all Redux has to offer. Besides logging, it has great DevTools that allow you to time travel actions, persist actions on page refresh, and more.

It is the Official Redux UI Bindings for React​

The Redux team knew that developers had problems with the complexity of Redux. So, they set out to create a solution that would streamline Redux workflow and make state management simpler for developers and React Toolkit was the result. An action object can have other fields with additional information about what happened.

Here, the component loops over each task in the tasks array and displays text and a delete button. When the user clicks the delete button, the handleDelete function is called, dispatching the deleteTodo action with the task’s id as the payload. In Redux, a reducer is a function that takes in the current state of an application and an action as arguments, and returns a new state based on the action. Action creators are functions that create and return action objects.

Redux Toolkit

In practice, Redux is normally used by installing the Redux packages from NPM, and the UI is created using a library like React. The Redux DevTools make it easy to trace when, where, why, and how your application’s state changed. Redux’s architecture lets you log changes, use “time-travel debugging”, and even send complete error reports to a server. Redux helps you write applications that behave consistently, run in different environments (client, server, and native), and are easy to test. In this guide, we discussed the major features of Redux and how Redux can be beneficial to your app.

The state and actions of the application can also be easily tracked and inspected using Redux DevTools. This feature helps debug and understand how the app works under the hood. As shown above, we can add tasks by entering texts in the input field and clicking the “Add task” button. We can also delete tasks by clicking the “delete” button next to each task.

What Is Redux?

By writing smaller and simpler functions that are isolated in scope and logic, we can make code much easier to test, maintain and debug. Now these smaller functions become reusable code, and that allows you to write less code, and less code is a good thing. The functions can be copied and pasted anywhere without any modification. This tutorial will introduce you to Redux and teach you how to use it the right way, using our latest recommended tools and best practices. By the time you finish, you should be able to start building your own Redux applications using the tools and patterns you’ve learned here.

• The current Redux application state lives in an object called the store .
• This is important because they help you understand the benefits of Redux and how it can be used.
• Given the same object, they should always produce the same result.
• We can also delete tasks by clicking the “delete” button next to each task.
• In most cases, more code is required to perform simple actions like button clicks or simple UI changes.
• The payload property contains an object with the new task’s id and text values.

It operates in a fashion similar to a reducing function, a functional programming concept. Here, while dispatching an action to the store, we’re passing a payload with some value which we’re using inside the reducer to increment or decrement the store value. So the above code is not correct, because in the reducer we should not modify the original state. Doing so will create issues in your application and so it’s not recommended. Inside the reducer function, we’re logging some text to the console and then returning the value of the state from the function. The recommended way to start new apps with React and Redux is by using our official Redux+TS template for Vite, or by creating a new Next.js project using Next’s with-redux template.

Why use Redux Toolkit?

We may very well maintain the internal state of the components inside them, but as and when an application grows bigger, it may have to share some state between components. This is not just only to show them in the view, but also to manage or update them or perform some logic based on their value. Whenever a user adds an item to the cart, the application has to internally handle that action by adding that item to the cart object. It has to maintain its state internally and also show the user the total number of items in the cart in the UI. We pass the reducer function to createStore, which uses the reducer function
to generate the initial state, and to calculate any future updates. Action objects always have a type field, which is a string you provide that
acts as a unique name for the action.

This might look overwhelming, but in most cases, you won’t need to create your own middleware because the Redux community has already made many of them available. If you feel middleware is required, you will appreciate its capacity to enable great work with the best abstraction. But, as we mentioned before, it can introduce a lot of boilerplate into your application due to the verbosity of its API. Because of this, it is recommended to use the Redux Toolkit while using Redux with React.

It is also possible to implement time travel — that is, the ability to move back and forth among the previous states and view the results in real time. Redux is an open-source JavaScript library designed for managing the state of a web application. It follows the principles of a predictable state container, which means that all application state is stored in a single, immutable object called the store. Changes to the application state occur through actions, and these changes are handled by reducers.