🚀 Rebuilding useEffect From Scratch to Truly Understand React

📰 Dev.to · chandra penugonda

Rebuild React's useEffect hook from scratch to understand its internals and improve your skills in React development

intermediate Published 14 Feb 2026

Action Steps

Build a custom useEffect hook from scratch using JavaScript
Run the custom hook in a React application to test its functionality
Configure the hook to handle different dependency arrays and cleanup functions
Test the custom hook with various use cases, such as API calls and DOM manipulations
Compare the custom implementation with the original React useEffect hook to identify differences and similarities

Who Needs to Know This

React developers and engineers who want to deepen their understanding of React hooks and their implementation can benefit from this exercise, as it enhances their ability to debug and optimize React applications

Key Insight

💡 Rebuilding React's useEffect hook from scratch helps developers understand its internals and improves their skills in React development