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react-useeffect

Review React components for useEffect usage and refactor anti-patterns.

Updated Nov 15, 2025
Search Tags:#frontend#react#javascript#cleanup#best-practices#useeffect
One-click install
npx skills add https://github.com/geinala/entry --skill react-useeffect-geinala
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: react-useeffect
Source: https://github.com/geinala/entry/tree/main/.agents/skills/react-useeffect
Command: npx skills add https://github.com/geinala/entry --skill react-useeffect-geinala

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill helps developers write safer, more efficient React effects by clarifying when to use useEffect, when to derive state with useState, and when to use alternative patterns, preventing common anti-patterns.

Core Features & Use Cases

  • Clear guidance on when to use useEffect vs alternatives such as useMemo, event handlers, and derived state
  • Anti-patterns and best practices with concrete examples for data fetching, synchronization, and cleanup
  • Practical refactor scenarios showing safe dependencies and cleanup to avoid memory leaks

Quick Start

Refactor a data-fetching component to apply correct dependency management and cleanup using useEffect.

Frequently Asked Questions about react-useeffect

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
When should I use useEffect vs useMemo or event handlers in React?▼

Use useEffect for synchronizing with external systems, while useMemo caches derived state and event handlers manage user interactions. This distinction prevents common React anti-patterns by ensuring effects only handle external synchronization rather than internal data derivation or direct user responses.

How do I implement proper cleanup in useEffect to avoid memory leaks?▼

Proper cleanup in useEffect requires returning a function that cancels subscriptions, timers, or fetch requests. This prevents memory leaks when components unmount by ensuring all external resources are safely released and validated through correct dependency arrays.

What is the best way to fetch data with useEffect in React components?▼

The best way to fetch data with useEffect is to manage dependencies correctly and implement cleanup functions to cancel outstanding requests. This approach avoids memory leaks during component unmounting and safely handles external data synchronization across modern React apps.

Why does my React component re-render infinitely with useEffect?▼

Infinite re-renders in useEffect typically occur when incorrect dependencies trigger continuous state updates. You can resolve this by validating dependencies and replacing useEffect with derived state using useMemo for calculations that do not require external synchronization.

Can I use useEffect for derived state in modern React apps?▼

You should not use useEffect for derived state in modern React apps because it causes unnecessary re-renders. Instead, calculate derived state directly during render or use useMemo, reserving useEffect strictly for external synchronization tasks like data fetching.

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