How to Use Redux and Redux Toolkit Tutorial for Beginners

In other words, the Redux pattern provides state management for JavaScript apps. You can use the Redux library with any frontend framework, such as React, Angular, or even Vue. In the end, you can implement the Redux pattern in any vanilla JS application. The component itself doesn’t know https://deveducation.com/ about Redux – it just accepts a user prop and renders the avatar image. The mapStateToProps function extracts the user from Redux’s store and maps it to the user prop. Finally, the connect function is what actually feeds the data from Redux through mapStateToProps and into Avatar.

• For example, if you’re creating an online school application, you’ll require that each user signs into the application to gain access using a sign-in component.
• Let’s define actions we want to dispatch to the reducer when the user clicks the increase or decrease button.
• While it’s mostly used as a state management tool with React, you can use Redux with any other JavaScript framework or library.
• Since objects must have a key value pair, the unique IDs of the contacts are used as keys to their respective user objects.
• The default value is there in case we create an action and we forget to add a case for that action.

In this case, we only have one reducer (taskReducer), so we pass it in as an argument to combineReducers. Note that to create actions, we use action creators. Action creators are functions that create and return action objects.

Give the Reducer an Initial State

Even though this approach works, this is typically used for server side rendering (don’t bother if you don’t know what this means). For now, understand that this approach is redux necessary of setting an initial state in createStore is more used in the real world for server side rendering. You can read more about the Lodash .values method if you want.

You’ll use code from react-redux to send actions from your components and to pull data from the store into your components. The purpose of a reducer is to change a UI component state based on a performed action. For example, if you’re creating an online school application, you’ll require that each user signs into the application to gain access using a sign-in component.

Files

Contacts are an object with mapped IDs to user objects. Let’s quickly go over the process of setting up the store of the App so we can retrieve the data required to build the list of users within the sidebar. However, if users were stored in the state as an object, when retrieved and passed on as props, users will remain an object. You can’t use map on objects — and it’s a lot harder to iterate over them. We have resolved how the contacts field will be designed within the application state object.

If you have a component structure like the one above – where props are being forwarded down through many layers – consider using Redux. I’ve heard from many, many people that Redux is the biggest barrier to writing the React apps they want to. With Redux, you can persist some of the app’s state to localStorage and restore it after a refresh. We’ll be implementing a similar example to the login component above but this time in Redux.

It’s as easy as pushing the state you want to utilize to your redux store and retrieving it. If you want to use some sort of state management in smaller projects, it might also be useful to utilize the Context API. While not a fully-fledged out solution like Redux, it can be beneficial for smaller applications where passing around state is a hassle, but there isn’t much to pass around.

The good news is you can always refactor a small project to start using Redux later. There is no point in over-engineering a project that doesn’t need to be. Even if you choose to not use Redux, learning a new concept is never bad! So, let’s dive in and see how we can integrate Redux into a Next.js application.

Within Sidebar.css we need to restrict the width of the Sidebar, plus a few other simple styles. Create two new files, Sidebar.js and Main.js within the root directory. If you’re a more experienced Engineer, be sure to use whatever CSS in JavaScript solution works for you. For simplicity, I’ll style the Skypey app with good ‘ol CSS — nothing more. I’ll leave you with your preferred way of doing things.

Sometimes you’re fetching truly global data that the whole app needs – think “user profile” or “i18n translations”. In those cases, dispatch the action right after you create the store, with store.dispatch, rather than waiting for a component to mount. In the case of addTodo, the type property is set to “ADD_TASK”, indicating that a new task has been added.

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