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What is the purpose of useEffect hook?

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Redowan Rafy answered on May 19, 2021 Popularity 9/10 Helpfulness 4/10

answer What is the purpose of useEffect hook?

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What is the purpose of useEffect hook?

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What does useEffect do? By using this Hook, you tell React that your component needs to do something after render. React will remember the function you passed, and call it later after performing the DOM updates.

Popularity 9/10 Helpfulness 4/10 Language javascript

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Tags: javascript use-effect

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Contributed on Oct 03 2021

Redowan Rafy

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how to use React useEffect Hook

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most common cases how useEffect implementation: 
- fetch data from API, 
- directly updating the DOM, 
- use timers and real-time data displays (such as BTC current price)
- validating input field
- trigger animation on new array value
- 

// 1- EVERY RERENDER
useEffect( () => {
  console.log("It runs everytime this component rerenders")
  });

// 2- ON MOUNT
useEffect( () => {
   console.log("It Only runs once (When the component gets mounted)")
   }, []);

// 3- DEPENDING ON CONDITION
useEffect( () => {
   console.log("It runs everytime the condition is changed")
   }, [condition]); //basically the dependency array determines when the rerender happens

// 4- DEPENDING ON CONDITION, BUT WITH "clean up"
useEffect( () => {
	console.log("It runs everytime my condition is changed")
	return () => {
    	console.log("Use this return as a 'clean up tool' (it runs before the actual code)")
        }
    }, [condition]);

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Tags: hook

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Contributed on Aug 31 2022

Gabriele Orlandi

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what does useeffect do

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If you’re familiar with React class lifecycle methods, 
you can think of useEffect Hook as componentDidMount, 
componentDidUpdate, and componentWillUnmount combined.

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Contributed on Jul 22 2021

QuietHumility

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what is useeffect

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useEffect is a hook for encapsulating code that has 'side effects,' and is like a combination of componentDidMount , componentDidUpdate , and componentWillUnmount . Previously, functional components didn't have access to the component life cycle, but with useEffect you can tap into it.23.1.2019

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Contributed on May 19 2021

Puzzled Penguin

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What is the purpose of useEffect hook?

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Load external data or interact outside of the component

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Contributed on Oct 02 2021

Concerned Cassowary

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What is the purpose of useEffect hook?

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