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5 Common React Mistakes

So I had the opportunity to give a talk at IIIT Raipur There I addressed common mistakes freshers and experienced devs both make in React. Since React is most widely used library, these subtle issues can hurt performance, maintainability, or scalability if left unchecked. Below are some code examples of common React mistakes and their fixes. 1. Using Array Index as Key in Lists vs Unique IDs I know it has been addressed to you many times, but still its the #1 issue I see in any react repo. Using the array index as a React list key, this is a lazy shortcut that can break ordering and cause inefficient updates. React’s diff algorithm relies on stable keys; using indexes can confuse the diff, leading to unexpected UI behavior and more re-renders. In the example below, moving or removing list items would mess up React’s tracking. //

Apr 27, 2025 - 19:48
 0
5 Common React Mistakes

So I had the opportunity to give a talk at IIIT Raipur
There I addressed common mistakes freshers and experienced devs both make in React.

Since React is most widely used library, these subtle issues can hurt performance, maintainability, or scalability if left unchecked.

Below are some code examples of common React mistakes and their fixes.

1. Using Array Index as Key in Lists vs Unique IDs

I know it has been addressed to you many times, but still its the #1 issue I see in any react repo.

Using the array index as a React list key, this is a lazy shortcut that can break ordering and cause inefficient updates. React’s diff algorithm relies on stable keys; using indexes can confuse the diff, leading to unexpected UI behavior and more re-renders.

In the example below, moving or removing list items would mess up React’s tracking.

//
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