REACT - General

    // <

    

    // <

    <button onClick={()=> removeItem(id)}>remove</button>
    use arrow functions to load the function only when button is clicked

    // Spread operator
    const [person, setPerson] = useState({
    name: "peter",
    age: 24,
    message: "random message",
    });
    setPerson({ ...person, message: "hello world" });

    Changes only a property of the object

    

    // USE EFFECT
    useEffect(() => {
    console.log("call useEffect");
    if (value > 0) {
    document.title = `New Messages(${value})`;
    }
    });

    

    // < CLEANUP FUNCTIONS

    

    // <

    

    // <