react useeffect examples
Example 1: useeffect react
useEffect(() => {
// code goes here
return () => {
// cleanup code codes here
};
},[]);
Example 2: react useeffect
import React, { useEffect } from 'react';
const [data,setData]=useState()
useEffect(() => {
fetch(`put your url/api request in here`)
.then(res=>res.json())
.then(json => setData(json))
},[])
Example 3: react useEffect
import React, { useEffect } from 'react';
export const App: React.FC = () => {
useEffect(() => {
}, [/*Here can enter some value to call again the content inside useEffect*/])
return (
<div>Use Effect!</div>
);
}
Example 4: useeffect componentdidmount
useEffect(() => {
messagesRef.on('child added', snapshot => {
const message = snapshot.val();
message.key = snapshot.key;
setMessages(messages.concat(message)); // See Note 1
}, []); // See Note 2