We’ll talk more about actions and reducers in the following sections. Being a state management library, Redux will basically store and manage all the application’s states. Having this single source of truth makes it much easier to debug any issues that come up. It’s also easier to test, and to reset the store to a known initial state. Well, let’s say you have a lot of user data that controls how your web application behaves. Redux is a popular Javascript library used to manage state in web applications.

Main pros of Redux

No more defining awkward, un-semantic classes in your HTML to suit your JavaScript. Users of frameworks like Backbone or Angular may have experience with re-rendering on data changes on the front-end. Since updating the DOM is the lengthiest part of the render process, this massive reduction in DOM updates greatly improves performance. It means you really can forget about the rendering process, which has never been true before in front-end. The benefit of this separation of concerns is you don’t have to concern yourself with whether something has been rendered before, or whether it’s the first time.

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Redux can be defined as an open source JavaScript library for managing application state. It consists ofDan AbramovandAndrew ClarkAt2015first launched in 2009. So reducers are basically what is redux for pure JS functions which take in the previous state and an action and return the newly updated state. We’ll take the cart component which displays the number of items in a user’s cart.

I won’t say library developers don’t have strong opinions on how their libraries should be used, because they certainly do. The problem is turnover and change is so rapid, these don’t have time to solidify into common practices. Only those really paying attention to monthly, weekly, daily changes in the React community could tell you the best way to use X library. We might assume that keeping the application’s state global will cause some performance penalty. For the most part, this isn’t the case, as React Redux implements a number of performance optimizations internally, so our own connected components only re-render when they actually need to. REDUCER:The Reducer reads the payload from the action and then updates the store with the state accordingly.

Debugging is easy in Redux

Ideally, the data in a component should live in just one component, so sharing data among sibling components becomes difficult. Without Redux, you would have to make data dependent on the components and pass it through different components to where it’s needed. First, we’ll review the basics of Redux and how it functions. Then we will see how using Redux can help you in your app by using a simple but practical component.

Main pros of Redux

Yet, you don’t always need Redux to manage the state of your application. First, we define the initial state for the application by setting the count equal to zero. Next, we define a counterReducer function that accepts the current state and the dispatched action. As we can dispatch multiple actions to the reducer, we’ll use a switch statement to handle the different actions. Each action contains a type (also seen as an identifier) and a payload. Next, a reducer accepts the action and changes the state based on the received action type and payload.

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For example, each major feature inside your app can have its own reducer. You might assume that keeping the app’s state global would result in some performance degradation. This eliminates the need to continuously pass state from one component to another. You can also select the slice from the store for a particular component; this makes your app more optimized.