I want to set the fetched data from firestore as initial value of useState

Question

I want to set the fetched data from firestore as initial value of useState but it gives me undefined value because I want to edit user profile and I'm not sure user edit which property I wanted to stay the other properties the same

import React, { useState, useEffect } from 'react';
import { useAuthState } from 'react-firebase-hooks/auth';
import { doc, onSnapshot } from "firebase/firestore";
import { auth, db } from '../../firebase';

export default function Form({ setEditForm }) {
    const [user, setUser] = useState([]);
    const [currentUser] = useAuthState(auth);

    // fetching user information from firestore
    useEffect(() => {
        const getUser = async () => {
            const docRef = doc(db, 'users', currentUser.uid)
            await onSnapshot(docRef, (doc) => {
                setUser({
                    ...doc.data(), id: doc.id
                })
            })
        }
        getUser()
    }, [])
    const [name, setName] = useState(user.firstName);
    const [surname, setSurname] = useState(user.surname);
    const [biograhpy, setBiography] = useState(user.biograhpy);
    const [location, setLocation] = useState(user.location);

    // the name is undefined why? I want to put the fetching data from firestore as initial value of use state but it's undefined
    console.log(`name ${name}`)

  );
}

Answer 1

I`m not sure, but I think you should do smth like this:

const [user, setUser] = useState([]);
const [currentUser] = useAuthState(auth);
const [name, setName] = useState();
const [surname, setSurname] = useState();
const [biograhpy, setBiography] = useState();
const [location, setLocation] = useState();
const getUser = async () => {
    const docRef = doc(db, 'users', currentUser.uid)
    try {
        await onSnapshot(docRef, (doc) => {
            setUser({
                ...doc.data(), id: doc.id
            })
        })
        setName(user.firstName)
        setSurname(user.surname)
        setBiography(user.biograhpy)
        setLocation(user.location)
    } catch (e) {
        console.log(e)
    }
    
}
// fetching user information from firestore
useEffect(() => {
    getUser();
}, [])

console.log(`name ${name}`)