Though we frequently use functions and components syntax in our daily coding routines, are we fully aware of how they manipulate the DOM and how many times they re-render? Let’s dive into the…

Swiss Dev

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When objects or arrays are created inline within the component, they are considered new instances with every render, even if the data is the same. When rendering a list of components, it’s essential to provide a unique key for each child. Using an index as a key can lead to unnecessary re-renders and potential issues with the state.

3+1 React common mistakes that triggers unnecessary re-renders

Déjà vu: I think I’ve seen this function before 👁️

<p>Very good explanation with examples, it’s worth giving time to a have a look at this 🤞👌</p>


<p>Amazing explanations, but you should have mentioned, that in simple apps these changes might even do worse to app’s performance, as useMemo and React.memo are somewhat heavy functions by itselves, and should be used only when they are really needed and add real increase to performance.</p>
