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Oct 12, 2018
In this tutorial, we’ll learn how to implement memoization in React. Memoization improves performance by storing the results of expensive function calls and returning those cached results when they’re needed again.
We’ll cover the following:
- how React renders the UI
- why there’s a need for React memoization
- how we can implement memoization for functional and class components
- things to keep in mind regarding memoization
This article assumes you have a basic understanding of class and functional components in React. If you’d like to brush up on those topics, check out the official React docs on components and props.
How React Renders the UI
Before going into the details of memoization in React, let’s first have a look at how React renders the UI using a virtual DOM.
The regular DOM basically contains a set of nodes represented as a tree. Each node in the DOM is a representation of a UI element. Whenever there’s a state change in your application, the respective node for that UI element and all its children get updated in the DOM and then the UI is re-painted to reflect the updated changes.
Find out more about this interesting topic here.
Article source: https://article-realm.com/article/Computers/Software/24655-How-to-Implement-Memoization-in-React-to-Improve-Performance.html
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