![]() Add the code below to app.js: import React from 'react' Next, we’ll generate the main representational component for rendering our application’s layout. Import * as serviceWorker from './serviceWorker' Import rootReducer from './reducers/rootReducer' To create the application store and set the entry point element node root, add the following code to index.js: import React from 'react' We’ll install the following dependencies in our project: Let’s see an example of this with code assume that we have a to-do list application with the central state in the reducer and the following folder structure: Therefore, the selector function has to perform the expensive calculation again. ![]() However, after a component re-renders in React, everything is created with a new reference. ![]() There are instances where our selector does not see any value change despite dispatching actions for the reducer or re-rendering the component. Ideally, the selector should return the same value without any calculations. We often perform expensive calculations in selector functions. ![]() In React Redux, when the useSelector() Hook’s reducer action is dispatched, it runs for every mounted component, recalculating the selector with every dispatch and causing performance issues. ![]() To follow along with this tutorial, you should be familiar React and Reselect. Let’s get started! SelectorsĮssentially, selectors are functions that take Redux state as an input and return a value derived from that state. In this tutorial, we’ll explore re-reselect by creating a simple to-do list application. To combat the problem, developers have introduced third-party performance optimization libraries like re-reselect, a wrapper for the popular library Reselect, which is used mainly with Redux to enhance performance by writing memoized selectors. While in smaller applications, these unnecessary re-renders typically go unnoticed, as a UI grows with heavier components rendering on the component tree, both developers and users experience the negative side effects. React re-reselect: Better memoization and cache managementĪlthough React’s components have a fast lifecycle, they suffer due to excessive re-rendering, harming production time and performance overall. ![]()
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