React 18: Handling Shallow Comparison in useEffect with Array Dependencies
This might be a silly question, but I'm facing an issue with `useEffect` not behaving as expected when I use an array as a dependency... I have a component that fetches data based on the values of an array, but even if the contents of the array are the same, `useEffect` keeps triggering. Here's the relevant part of my code: ```javascript import React, { useEffect, useState } from 'react'; const MyComponent = () => { const [data, setData] = useState([]); const [filterParams, setFilterParams] = useState(['param1', 'param2']); useEffect(() => { const fetchData = async () => { const response = await fetch(`https://api.example.com/data?filters=${filterParams.join(',')}`); const result = await response.json(); setData(result); }; fetchData(); }, [filterParams]); return <div>{JSON.stringify(data)}</div>; }; export default MyComponent; ``` Initially, I expected `useEffect` to trigger only when the `filterParams` array changes. However, it seems to trigger on every render, which is causing unnecessary API calls. I checked the values in the array and they remain unchanged during certain updates, yet `useEffect` runs again. To troubleshoot, I've tried using `JSON.stringify(filterParams)` as a dependency, but that leads to a performance hit due to stringifying on every render. Also, I attempted to wrap the state update in a condition to prevent it from running if the values are the same, but that didn't seem to help. Am I missing something here, or is there a better way to handle shallow comparisons in dependency arrays? Any insights would be greatly appreciated! This is for a CLI tool running on Debian. What's the correct way to implement this? I'm working in a Linux environment.