![]() ![]() useReducer useCallback useMemo useRef useImperativeHandle useLayoutEffect. Import UserPostsIndex from './UserPostsIndex' Ĭonst = useState ( allPosts ) Ĭonst = useState ( new Date ( ). They let you use state and other React features without writing a class. Import sortPosts from './utils/sortPosts' Import allPosts from '././data/allPosts.json' Import fetchUpdatedPosts from './fetch/fetchUpdatedPosts' We're going to jump back to the component for this example: In React, we do this with the useMemo() hook. The discussion of this article is focused on optimizing performance by memoizing the value of resource-intensive functions, such as a sorting function. Here you can find the example app's live code It is crucial to pay close attention to how the change of a parent's state triggers the re-render of its descendants. Similar to the useglobals hook, we recommend optimizing your addon to rely on mo, or the following hooks useMemo, useCallback to prevent a high volume of re-render cycles. Allow yourself some time to understand the components individually, their relationships, their state changes, and how props are passed through. It allows access to Storybooks internal state. There are several components involving a user seeing the latest posts and a list of the user's posts. The example app is based on the idea of a list of posts on a blog. In this post, we dive into the details of the useMemo hook with an extension of the example demonstrated in the previous post titled Memoization using React memo. It is very useful in optimizing the performance of a React component by eliminating repeating heavy computations. UseMemo() is a function that returns a memoized value of a passed in resource-intensive function. This post is about how to use the useMemo() hook in React.
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