useEffect react hooks code step by step
Автор: Alex Dunlop
Загружено: 2025-10-17
Просмотров: 731
Описание:
useEffect confusing you? Here's the breakdown that ACTUALLY makes sense
Here's useEffect step-by-step:
1. Basic useEffect: Runs after every render - use sparingly!
2. With dependencies: Only runs when specific variables change - this is what you want 90% of the time.
3. Empty dependency array: Runs only once when component mounts.
4. Cleanup function: CRITICAL for preventing memory leaks - always cleanup timers and subscriptions!
The 3 useEffect rules:
No dependencies = runs every render (usually bad)
Empty array = runs once (great for setup)
With variables = runs when those change (most common)
Pro tip: If you're not using cleanup functions, you're creating bugs. Period.
#react #useeffect #reacthooks #javascript #webdev #programming #frontend #developer #reactjs #coding
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