Hello React Learners,
Today we will learn about React useEffect hook. This tutorial will cover, What are hooks in react? What is useEffect hook in React? And an example of useEffect React hooks.
So let’s discover React js useEffect Hook.
Contents
ReactJS hooks allow using additional react features like managing state and performing after effect. React hook function allows using react features without writing a class. ReactJS hooks are backward-compatible. In version 16.8, ReactJS hooks were added.
So you got the idea about ReactJS hooks, now let us learn about React useEffect hook.
useEffect hook React accepts two arguments. The second argument is optional.
useEffect(<function>, <dependency>)
Firstly, you need to import useEffect hook in React
import {useEffect } from "react";
Runs on every render
useEffect(( ) => { });
Runs only on the first render
useEffect(( ) => { }, [ ]);
Runs on the first render And any time any dependency value changes
useEffect(( ) => { }, [prop, state]);
useEffect(( ) => { effect return ( ) => { cleanup } }, [input])
import { useState, useEffect } from "react"; import ReactDOM from "react-dom/client"; function Counter() { const [count, setCount] = useState(0); const [calculation, setCalculation] = useState(0); useEffect(() => { setCalculation(() => count * 2); }, [count]); // <- add the count variable here return ( <> <p>Count: {count}</p> <button onClick={() => setCount((c) => c + 1)} >+</button> <p>Calculation: {calculation}</p> </> ); }
Hope you got the clear idea about React hooks useEffect. If you face any problem, you can ask me in the comment box or Hire a React Developer. Share the tutorial with your friends and stay in touch to learn more about ReactJS.
Happy Coding!
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View Comments
This post is a lifesaver for React newbies like me! The way it walks through the useEffect hook with a real example makes it click instantly. Thanks for breaking down the complexity and making it feel like a piece of cake. Now I'm all set to level up my React game!
Great post! Thanks for writing such a helpful and informative post about the useEffect hook in ReactJS. I've been working with this framework for a while now, but I still find some of the more advanced concepts to be a bit confusing. Your examples and explanations really cleared things up for me and helped me to better understand how and when to use useEffect. I especially appreciate that you included code snippets to illustrate your points - seeing the actual syntax in action makes it so much easier to grasp.