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Understanding Redux: Beginner’s guide to modern state management

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For this app, we’re going to track a single number with the current value of our counter. A “store” is a container that holds your application’s global state. The rest of the description on this page focuses solely on the Redux core library (the redux package). We’ll talk about the other Redux-related packages as we go through the rest of the tutorial. This helps you restrict any part of the view or any network calls to write/update the state directly.

Redux is the best choice for developers as it drives them to make better decisions while developing an application. In case any project needs a state management tool, Redux is the best option to reap the benefits in the what is redux for long run. React, and Angular has a lot of popularity among tech companies across the globe as well as in India. Everyone who enters the world of React needs to understand how to handle the state of the application.

When to use Redux

Context has been around with React for quite a while, but it has changed significantly since its inception. Up to version 16.3, it was a way to handle the state data outside the React component tree. It was an experimental feature not recommended for most use cases. On top of that, Redux prevents race conditions where two components simultaneously try to update the state.

For example, if an action type is ADD_TASK, the payload might be an object containing a new task item’s “id”, “text”, and “completed status”. Imagine you are building a house and need to keep track of all the materials you use and how much money you spend. Instead of keeping track of everything in your head or on a piece of paper, you could use a ledger to keep track of every transaction. Redux works similarly by keeping track of your application’s state in a single place called the “store.” Note that we use the reducer function as an argument for the createStore function to define a new Redux store for our application.

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Redux is a popular library many projects and companies use to manage state and side effects, with a big community and great documentation. It’s certainly worth trying out in a future project if you are new to it. Redux was originally designed to be used with React, so Redux is certainly good with React. The two libraries are often used together to build complex web applications. Having this single source of truth makes it much easier to debug any issues that come up.

  • If you want to learn more about why Facebook came up with Flux, watch this video.
  • Therefore, only basic styles were included to ensure the application looked presentable.
  • The bigger and more complex your app gets, the more likely it’s going to be that you’d benefit from using Redux.
  • It operates in a fashion similar to a reducing function, a functional programming concept.
  • Some nice things you can do with Redux are logging, hot reloading, time travel, universal apps, recording, replay, etc.
  • This is because the store is connected using the reducer function, but we have not added any code inside the reducer to manage the store.

This tutorial is intended to provide the readers with adequate knowledge on what is Redux and how it works. After completing this tutorial, you will find yourself at a moderate level of expertise in the concepts of Redux. You can use Redux together with React, or with any other view library.

Redux helps you write applications that behave consistently, run in different environments (client, server, and native), and are easy to test. That is the reason we have defined all three actions with the same type of field. Treat them like customers in a bank with the same intent/action of depositing money (type) but different amounts (text). Takes inspiration from libraries like Immer and Autodux to let you write “mutative” immutable update logic, and even create entire “slices” of state automatically. The above code defines a slice named todoSlice, with an initialState object that contains an empty array of tasks. Finally, it’s important to note that an application’s state is stored in memory when using Redux.

what is redux for

So lets say a user clicks on a button, we then call an action creator which is a function that returns an action. That action has a type that describes the type of action that was just triggered. The store is a “container” (really a JavaScript object) that holds the application state, and the only way the state can change is through actions dispatched to the store.

what is redux for

As applications grow in size and complexity, managing this state can become difficult. Redux Toolkit is our recommended approach for writing Redux logic. It contains packages and functions that we think are essential for building a Redux app. Redux Toolkit builds in our suggested best practices, simplifies most Redux tasks, prevents common mistakes, and makes it easier to write Redux applications.

what is redux for

Redux is a popular Javascript library used to manage state in web applications. In any application, the user interface will show existing state on screen. When a user
does something, the app will update its data and then redraw the UI with those values. Take some time to think about the kind of app you’re building, and decide what tools would be best to help solve the problems you’re working on. For example, there can be a reducer handling the state of the cart in a shopping application, then there can be a reducer handling the user details part of the application, and so on.

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