1function useFormValidation(initialState) {
2    const [values, setValues] = useState(initialState);
3    const [errors, setErrors] = useState({});
4    const [isSubmitting, setIsSubmitting] = useState(false);
5
6    useEffect(() => {
7        if (isSubmitting) {
8            ________________________
9            ________________________
10            ________________________
11        }
12    }, [values, isSubmitting]);
13
14    function handleChange(event) {
15        const { name, value } = event.target;
16        setValues(prev => ({
17            ...prev,
18            [name]: value
19        }));
20    }
21
22    function handleSubmit(event) {
23        event.preventDefault();
24        setErrors(validate(values));
25        setIsSubmitting(true);
26    }
27
28    return {
29        values,
30        errors,
31        handleChange,
32        handleSubmit,
33        isSubmitting
34    };
35}