Скачать или смотреть Solving the Infinite Rerendering Issue in React Hooks

Learn how to avoid infinite rerenders in React hooks caused by object literals as dependencies, and implement optimal solutions for API calls.
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This video is based on the question https://stackoverflow.com/q/65781880/ asked by the user 'Alexander Hörl' ( https://stackoverflow.com/u/7349614/ ) and on the answer https://stackoverflow.com/a/65782310/ provided by the user 'Patrick Roberts' ( https://stackoverflow.com/u/1541563/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the Infinite Rerendering Issue in React Hooks: A Comprehensive Guide

In the world of React, hooks have significantly simplified state management and side effects. However, one common pitfall that developers face is the dreaded infinite rerendering when using custom hooks. This guide explores a specific issue where passing an options object causes your useAPICall and useFetch hooks to rerender infinitely, along with effective solutions to resolve this problem.

The Problem: Infinite Rerendering

As illustrated by a developer's experience, the problem arises when using the useFetch hook that fetches data based on dynamic options provided by another hook, useAPICall. The developer found that every time the useFetch hook is executed with an options object, it triggers a state change resulting in continuous rerenders. Here's a summary of the root issue:

Symptoms: Every call to useAPICall or useFetch with changing options causes infinite rerenders.

Trigger: This occurs because the effect inside useFetch is dependent on the options object, which is recreated upon each render leading to a continuous cycle of fetching.

Understanding the Cause

The main culprit behind the infinite rerendering is quite straightforward: passing an object literal as a dependency to useEffect causes the dependency to change with every render, resulting in the effect being triggered multiple times. Here’s how that happens:

New Reference Created: When an object is defined directly within your component or hook, it generates a new reference each time it is rendered.

Effect Triggered: Since the reference changes, useEffect re-executes, calling the fetch function repeatedly, culminating in countless network requests.

Solutions to Break the Cycle

To tackle this problem, there are a couple of established approaches you can consider:

1. Memoizing the Options

Using the useRef hook will help you store the options so that its reference remains the same for the life of the component unless its value actually changes. Here’s how you can implement this in your useAPICall hook:

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2. Using useRef in useFetch

If your situation requires more sensitivity to options changes, and you want to keep track of the latest options while still preventing rerenders, here’s an alternate approach where you incorporate logic directly within useFetch:

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Conclusion

Understanding how dependencies work in useEffect is crucial for avoiding infinite rerenders in React applications. By carefully managing how you pass objects into hooks, you can work around the quirks of JavaScript and React to ensure optimal performance and effective data fetching.

If you encounter similar issues with your React hooks or have any questions, feel free to reach out in the comments or explore more on the React documentation! Happy coding!