React useEffect Common Mistakes: The Ultimate Beginners Guide

ReactJS useeffect hook common mistakes

1. Not providing a dependency array:
When using useEffect, you must pass a dependency array as the second argument to specify which variables or props the effect depends on. If the dependency array is empty or not provided, the effect will run on every render, which can lead to performance issues and unexpected behavior.

2. Forgetting to include dependencies in the dependency array:
If you omit some dependencies from the dependency array that your useEffect relies on, it can lead to bugs and stale data. Make sure to include all the variables or props that the effect depends on to ensure it runs correctly.

3. Primitive and Non-primitive Dependency

4. Not cleaning up properly:
useEffect can return a cleanup function, which runs when the component unmounts or when the dependency array changes. Failing to clean up resources (like event listeners or subscriptions) can result in memory leaks and unexpected behavior.

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