The component above also has a console.log statement to help you know when it renders and re-renders. The todo array will be passed as a prop to the Todo component: You will have the parent component that holds your todo array in a state. Suppose you have a React application such as a Todo application in which you decide to break up the application into separate components to ensure it is easy to understand and use. The major point is that you should use it when your component often renders with the same props. Use it if your component is big enough (contains a decent amount of UI elements) to have props equality check.Īt this point, you now understand when to use React Memo and what it does.If you are using a class component, use the React.PureComponent. Use it in pure functional components alone.This happens to child components who are forced to re-render with the same props whenever the parent component renders. Use it when your component often renders with the same props.Use React Memo if your component will render quite often. ![]() If the state and content of your component will ALWAYS change, React Memo becomes useless. For example, React Memo is used to avoid unnecessary re-renders when there is no change to the state or context of your component. It is important to know when and where to memoize your component else it would not fulfill its purpose. But this doesn’t mean you should memoize all your components to ensure maximum performance optimization of performance □. You now know what it means to memoize a component and the advantages of optimization. Note: A memoized component will only re-render when there is a change in props value or when the state and context of the component change. It is either you wrap the actual component directly without having to create a new variable to store the memoized component: ![]() There are two ways you can wrap your component with mo(). This improves performance because it memoizes the result and skips rendering to reuse the last rendered result. React Memo is a higher-order component that wraps around a component to memoize the rendered output and avoid unnecessary renderings. When a parent component re-renders, so do all of its child components. ![]() However, this can impact your application's performance because, even if the change is only intended to affect the parent component, every other child component attached to the parent component will re-render. What is React Memo? AnchorĬomponents in React are designed to re-render whenever the state or props value changes. You will also learn how it works with detailed examples and codes. In this article, you will learn what React Memo means, what it does, how it works, and when or when not to use it. Memoization is a form of caching used to store results of expensive functions and avoid repeated calls, leading to repetitive computation of results.
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