react hook didmount code example
Example 1: use effect like component did mount
useEffect(() => {
console.log('I am the new componentDidMount')
}, [])
Example 2: react useEffect
import React, { useEffect } from 'react';
export const App: React.FC = () => {
useEffect(() => {
}, [])
return (
<div>Use Effect!</div>
);
}
Example 3: useeffect componentdidmount
useEffect(() => {
messagesRef.on('child added', snapshot => {
const message = snapshot.val();
message.key = snapshot.key;
setMessages(messages.concat(message));
}, []);