What is Reselect

What is Reselect?

Reselect is a library for React and React Native that allows developers to create memoized selectors. These selectors are functions that compute derived data from the Redux store, and they are used to efficiently extract and transform data for components.

How does Reselect work?

Reselect works by creating memoized selectors that only recalculate their value when their input selectors have changed. This helps to optimize performance by avoiding unnecessary recalculations and re-renders of components.

Why use Reselect?

Reselect is useful for optimizing performance in React and React Native applications by reducing the number of times data is recalculated and components are re-rendered. It also helps to simplify the codebase by centralizing the logic for deriving data from the Redux store.

Benefits of using Reselect

Some of the benefits of using Reselect include improved performance, reduced unnecessary re-renders, simplified codebase, and easier maintenance of selectors. It also helps to improve the overall user experience by ensuring that components only update when necessary.

How to implement Reselect

To implement Reselect in a React or React Native application, developers need to create selectors using the createSelector function provided by the library. These selectors can then be used in mapStateToProps functions to extract and transform data from the Redux store.

Example of using Reselect

“`javascript
import { createSelector } from ‘reselect’;

const getUsers = state => state.users;
const getActiveUsers = createSelector(
getUsers,
users => users.filter(user => user.isActive)
);
“`

Conclusion

In conclusion, Reselect is a powerful library for optimizing performance in React and React Native applications by creating memoized selectors. By using Reselect, developers can improve the efficiency of their codebase and provide a better user experience for their users.