I was following a Backend REST Api tutorial, and in the video, this is what he did, creating a user object, then changing newUser.password to the hash generated.

// Data is valid, register user
let newUser = new User({
    name,
    username,
    password,
    email,
});
// Hash password 
bcrypt.genSalt(10, (err, salt) => {
    bcrypt.hash(newUser.password, salt, (err, hash) => {
        if (err) throw err;
        newUser.password = hash;
        newUser.save().then(user => {
            return res.status(201).json({
                success: true,
                msg: "User is now registered"
            })
        })
    })
})

Why not just do it all at once?

// Why not do it in one go instaed of creating and then changing User?
bcrypt.genSalt(10, (err, salt) => {
    bcrypt.hash(password, salt, (err, hash) => {
        if (err) throw err;
        let newUser = new User({
            name,
            username,
            hash,
            email,
        });
        newUser.save().then(user => {
            return res.status(201).json({
                success: true,
                msg: "User is now registered"
            })
        })
    })
})

Is there something wrong with doing it together?