Learn how React's useCallback hook boosts performance by memoizing functions and preventing unnecessary re-renders with practical examples.

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The useCallback hook in React helps optimize performance by memoizing functions and preventing their recreation on each render. This is particularly useful in avoiding unnecessary re-renders of memoized child components. The article demonstrates its application with examples, such as optimizing event handlers in an e-commerce app. It also compares useCallback with other related hooks like useMemo, useEffect, and useRef to highlight different use cases. Proper usage of useCallback can significantly enhance the efficiency of React applications.

React useCallback: When and how to use it for better performance

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How useCallback prevents unnecessary re-renders

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Avoiding unnecessary dependencies with useCallback

Writing more efficient custom hooks with useCallback

Comparing useCallback to useMemo, useEffect, and useRef

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<p>Nice explained mate. Added it as a mandatory read for my frontend devs, as its sad to see how little people actually understand proper usage of callback/memo etc. Should be bread and butter imo.</p>


<p>Most of the time, you don’t need useCallback. You should use useCallback for content-generation functions, but NEVER for events. Please use useRef instead or custom useEvent (no useEffect or deps checks is needed !!), or naked function when there is few re-rendering. In my last experience with a 500-tsx-files-repo, they were only 2 useCallbacks, 300+ useEvent, and more naked functions : for the best performance !!</p>
