useEffect đang là một method giống như hàm componentDidUpdate (ok)

https://viblo.asia/p/su-dung-useeffect-trong-reacthooks-1Je5EPbmlnL

import React, {useEffect, useState} from 'react';

export const EffectDemo = () => {
    //State
    const [fullName, setFullName] = useState({name: 'name', familyName: 'family'});
    const [title,setTitle] = useState('useEffect() in Hooks');

    //useEffect
    useEffect(() => {
        console.log('useEffect has been called!');
        setFullName({name:'TrungHC',familyName: 'HCT'});
    });

    return(
        <div>
            <h1>Title: {title}</h1>
            <h3>Name: {fullName.name}</h3>
            <h3>Family Name: {fullName.familyName}</h3>
        </div>
    );
};