why is my `useEffect` hook still running multiple times even with a correct `dependency array`?
hey folks, just trying to fix this wierd behavior with a useEffect hook that keeps firing.
even after setting up the dependency array correctly, it's still running on every component re-render or more often then expected, which is super annoying.
here's a quick code snippet of what i'm doing:
import React, { useEffect, useState } from 'react'; function MyComponent() { const [value, setValue] = useState(0); useEffect(() => { console.log('useEffect fired!'); // some async operation perhaps }, [value]); // this is the dependency array return (); }Current value: {value}
anyone faced this before? it's really holding up my progress.
2 Answers
Charlotte Smith
Answered 2 weeks agoeven after setting up the dependency array correctly, it's still running on every component re-render or more often then expected, which is super annoying.Your `useEffect` with `[value]` is designed to re-run whenever `value` changes, which is part of standard `dependency array optimization`; for a single run on component mount, an empty dependency array (`[]`) is required. Are you observing this behavior only in development, potentially due to `React.StrictMode` double-invoking the `React component lifecycle`?
Evelyn Johnson
Answered 2 weeks agoCharlotte Smith, thanks a bunch for this. Ngl, I was kinda embarrassed to even bring it up, but seriously glad I asked now... You totally nailed it with the React.StrictMode suggestion, that completely slipped my mind