2 min read

Redux is an implementation of FLUX, which is a pattern for managing application state in React. Redux brings a clean and testable design to the table using a purely functional approach. Redux completes the missing piece of the React framework and is used at the core of React for most complex React projects.

This video tutorial talks about why Redux is needed and touches upon the Redux Flow.

Why Redux?

If you have written a large-scale application before, you will know that managing application state can become a pain as the app grows. Application state includes server responses, cached data, and data that has not been persisted to the server yet.

Furthermore, the User Interface (UI) state constantly increases in complexity.

Let’s take the example of an e-commerce website. Any website contains a lot of components, for instance, the product view, the menu section, the filter panel. Whenever we have such a complex app, whether it be a mobile or a web app, it becomes difficult to communicate between components and to know each other’s updated state.

For instance, when you interact with the price filter slider, the product view changes. This can obviously work if we have a parent component calling the child component and share properties. However, this works only for simple apps. For complex apps, it becomes difficult to manage the state and update history between multiple components.

Redux comes to the rescue here. In order to understand the functioning of Redux, we will go through a flow chart.

Redux Flow

Redux Flow

Action

Whenever a state change occurs in the components, it triggers an action creator. An action creator is a function called action. Actions are plain javascript objects of information that send data from your application to your store. They are the only source of information for the store.

Reducers

After action, returns this object, it is handled by Reducers. Reducers specify how the application’s state changes in response to actions sent to the store, depending on the action type.

Store

The store is the object that brings them together. It holds the application state, allows access to state, and allows state to be updated.

Provider

The provider distributes the data retrieved from a store to all the other components by encapsulating a main base component.

This all seems highly theoretical, and may seem a bit difficult to gulp down first. But once you practically apply it, you will get used to complex terminologies and how Redux flows.

Don’t forget to watch the video tutorial from Learning React Native Development by Mifta Sintaha to know more about Redux. For a comprehensive guide to building React Native mobile apps, buy the full video course from the Packt store.

Read Next

Introduction to Redux
Creating Reusable Generic Modals in React and Redux
Minko Gechev: “Developers should learn all major front-end frameworks to go to the next level”


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