Скачать или смотреть Proper Use of useEffect with useState in Async Functions

Learn how to effectively use `useEffect` with `useState` in asynchronous functions in React. This guide addresses common pitfalls and provides best practices for managing component state.
---
This video is based on the question https://stackoverflow.com/q/69862264/ asked by the user 'Thanos Dodd' ( https://stackoverflow.com/u/12251245/ ) and on the answer https://stackoverflow.com/a/69862348/ provided by the user 'jmk' ( https://stackoverflow.com/u/12860195/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Proper use of useEffect with useState called within async function

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Proper Use of useEffect with useState in Async Functions: A Comprehensive Guide

Salutations, fellow React developers! If you've ever found yourself tangled in the complexities of managing state with useState and useEffect inside an async function, you're not alone. In this post, we'll break down the common issues you may encounter and provide a clear, structured solution that will help you use these hooks effectively.

The Challenge: Infinite State Loops

In a recent discussion, a developer encountered a frustrating problem while trying to manage state with useState and useEffect. Here’s a quick overview of the code snippet he shared:

[[See Video to Reveal this Text or Code Snippet]]

What's Wrong Here?

The issue lies primarily in the following parts of the code:

Infinite Loop of setStates: The useEffect depends on retrievedData, which means every time retrievedData changes, it triggers another execution of useEffect, leading to an infinite loop.

Improper Async Handling: Wrapping an async call directly within useEffect without defining the async function inside it can lead to unexpected results.

Why Does This Matter?

Managing state properly ensures that your component remains responsive and improves performance. An infinite loop can lead to increased memory usage and ultimately crash your application.

The Solution: Refactoring Your Code

To solve the issues outlined above, follow this structured approach:

Step 1: Define the Async Function Inside the useEffect

Instead of calling fetchInfo directly in the component body, you can define it as an inner function within useEffect. This way, it will run on component mount only once.

Step 2: Use Empty Dependency Array

To avoid infinite loops, use an empty dependency array [] as the second argument of useEffect. This ensures that your effect runs only once when the component mounts.

Step 3: Complete Example

Here’s how you can adjust your original code:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following these steps, you can efficiently use useEffect with useState inside async functions without falling into common traps like infinite state loops. This structured approach not only makes your code more readable but also enhances the performance of your React components.

Happy Coding! If you have any questions or further insights, feel free to share them in the comments below. Remember, mastering these hooks will significantly improve your React development experience!