The reducer handles how the state (application data) will change in response to an action. When using Redux along with JavaScript library React, you can also manage state for React components. This makes it easier to build more complex, interactive applications with React. Using Redux also gives you a clear way to access and update the state of your individual components.

This gives us a way to write whatever sync or async code we want, while still having access to dispatch and getState. We know that we’re not allowed to what is redux for put any kind of async logic in reducers. Redux allows store setup to be customized with different kinds of plugins (“middleware” and “enhancers”).

Application Scalability

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. I want you to think of slice as the features of your application for example increasing and decreasing the number of items in the cart or triggering a modal. The bigger the application the more features we are going to have. It is worth noting that Redux is not part of ReactJS, despite being frequently used together. While Redux solves many problems, it also introduces new challenges.

• For now, forget about the HelloTech component implementation.
• Redux is the state manager for our application, so we need to take away the state object, and we want it to be managed by Redux.
• The current Redux application state lives in an object called the store .

You can play around with it by clicking the buttons in the app preview on the right, and browse through the source files on the left. Note that the state parameter is a default parameter which accepts an initial state. This is to handle the scenario when the reducer is called for the first time when the state value is undefined. “Actions can be recorded and replayed later, so this makes state management predictable. With the same actions in the same order, you’re going to end up in the same state.”

Redux – Basic Understanding of the Concepts for Beginners

We’ll be implementing a similar example to the login component above but this time in Redux. Redux allows you to manage your app’s state in a single place and keep changes in your app more predictable and traceable. It makes it easier to reason about changes occurring in your app. But all of these benefits come with tradeoffs and constraints. One might feel it adds up boilerplate code, making simple things a little overwhelming; but that depends upon the architecture decisions. It was created by Dan Abramov around June 2015, inspired by Facebook’s Flux and functional programming language Elm.

Whatever is returned from the reducer will become the new value of the store. Then we pass that reducer function to the createStore function as the first argument and 0 as the initial value of the state as the second argument. In both of those reducers, we don’t actually need to have our code look at the action object. It will be passed in anyway, but since we don’t need it, we can skip declaring action as a parameter for the reducers.

Advantages of using Redux

They’ll provide feedback, support, and advice as you build your new career. We’ll talk more about the rules of reducers later, including why they’re important and how to follow them correctly. Before we dive into some actual code, let’s talk about some of the terms and concepts you’ll need to know to use Redux. You can use Redux together with React, or with any other view library. It is tiny (2kB, including dependencies), but has a large ecosystem of addons available.

Well, the documentation has explanatory stuff when you start reading it. You may also have a lot of data changing in your application over time. Now, we will import the reducer into the store.js file to perform the actions on the states. This function will accept the value of the initial state and a lookup table of the action types to create a reducer for handling all types of actions. The modern world applications depend not only on their user interface, but their state management is also necessary for them to perform appropriately.

Setting up a Redux store and writing reducers can be a cumbersome and error-prone process that involves a lot of boilerplate code and manual configuration. As the documentation states, Redux is a predictable state container for JavaScript apps. To rephrase that, it’s an application data-flow architecture, rather than a traditional library or a framework like Underscore.js and AngularJS.