With the considerable amount of code required to set up Redux, imagine what our codebase would look like when we have multiple components to work with. Note how in the above example, we dispatch an action on click of the button. Or rather, to be more specific, we dispatch something known as an action creator – that is, the function addItemToCart(). This in turn returns an action which is a plain JS object describing the purpose of the action denoted by the type key along with any other data required for the state change. In this case, it’s the name of the book to be added to the cart denoted by the payload key. If the same state and action are passed to a reducer, the same result is always produced because reducers are pure functions.

• It should be considered and maintained as a single source of truth for the state of the application.
• Some developers argue that Redux introduces unnecessary boilerplate, potentially complicating what are otherwise simple tasks.
• In this guide, we discussed the major features of Redux and how Redux can be beneficial to your app.
• Now, if we toggle a todo item, the list of IDs will be considered the same, and won’t have to re-render.
• It’s lightweight at 2KB (including dependencies), so you don’t have to worry about it making your application’s asset size bigger.

Now imagine what happens when a state has to be shared between components that are far apart in the component tree. This makes the state difficult to maintain and less predictable. In our store.js file, we used the createContext() method from what is redux React to create a new context. Remember that the createContext() method returns an object with a Provider and Consumer component. This time, we’ll only use the Provider component and the useContext Hook when we need to access our state.

Benefits of using Redux

This guide covers methods for enhancing rendering speed in Vue.js apps using functions and techniques like `v-once`, `v-for`, `v-if`, and `v-show`. When the button is clicked, it triggers the dispatch function with the specified action type, which will be handled by the reducer function to update the state accordingly. Even though Redux solves our state management problem, it is time-consuming to use, has a difficult learning curve, and introduces a whole new layer of complexity to our application. When combined with React Hooks, we have a state management solution that is less time-consuming to set up, has an easier learning curve, and requires minimal code. We already saw how to write a selector that counts completed todos earlier. For the filters values, both the status filter value and the color filters values live in the state.filters slice.

If you feel middleware is required, you will appreciate its capacity to enable great work with the best abstraction. The reducer in Redux is a normal, pure function that takes care of the various possible values of state using the switch case syntax. But that means several things need to be taken care of — most importantly, keeping the state immutable. ???? A pure function is a function that will always return the same value if given the same parameters, i.e., the function depends on only the parameters and no external data.

Javascript

It was initially released in 2015 by Dan Abramov and Andrew Clark. Remember, this data is not needed by the parent component, but because its children need to share data, it has to provide a state. Redux is an example of a JavaScript library whose enduring popularity is a testament to its value. In this guide, we’ll provide a foundational understanding of Redux, highlighting its functionalities and why you should use it. We’ll explore its benefits by using a simple but practical component. When diving into web development, it’s important to learn the basics of React and Redux.

At all times the application is up and running, this component has to show the updated number of items in the user’s cart. As the official binding library for React and Redux, React Redux has a large community of users. This makes it easier to ask for help, learn about best practices, use libraries that build on top of React Redux, and reuse your knowledge across different applications. There is a central store that holds the entire state of the application. Each component can access the stored state without having to send down props from one component to another.

Redux middleware

This results in a fairly effective solution for state management in React applications. And yet, far too many React developers default to Redux for state management without considering the alternatives. In this tutorial, we’ll introduce you to the React Context API for state management and explain how React Hooks and the Context API can replace Redux. Our app creates a store, passes the store to the React UI layer using , and then calls useSelector and useDispatch to talk to the store in our React components.

The first React-Redux hook that we’ll look at is the useSelector hook, which lets your React components read data from the Redux store. Much like we designed the state structure based on requirements, we can also design the overall set of UI components and how they relate to each other in the application. That said, Redux was specifically designed to work well with React. React lets you describe your UI as a function of your state, and Redux contains state and updates it in response to actions.

What is React Context API?

In the above example, on clicking the button, we had dispatched an action with an action creator called addItemToCart(). This action creator has dispatched an action with the type ADD_ITEM_TO_CART. 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.

When choosing between React Context API and Redux, it’s important to consider the specific needs and constraints of your project. React Context API is more suitable for scenarios where state updates are infrequent or simple, and centralized state management is not critical. On the other hand, Redux is more suitable for scenarios where state updates are frequent or complex, and centralized state management is critical. 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.

Redux Toolkit is our official recommended approach for writing Redux logic. It wraps around the Redux core, and 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. The process of subscribing to the store, checking for updated data, and triggering a re-render can be made more generic and reusable. A UI binding library like React Redux handles the store interaction logic, so you don’t have to write that code yourself.

When using Redux with React, states will no longer need to be lifted up. This makes it easier for you to trace which action causes any change. We’ll be implementing a similar example to the login component above but this time in Redux.

It’s all about efficiency, especially with the virtual DOM ensuring your app runs smoothly. And then there’s Redux, stepping in like a superhero for state management. Together, React and Redux not only simplify UI development but also improve the way for scalable and maintainable applications. It’s important to consider the complexity and specific requirements of your project when deciding whether to use Redux or the Context API.