import React from 'react';import { useForm } from 'react-hook-form'; function App() {  const { register, handleSubmit, errors } = useForm(); // initialise the hook  const onSubmit = (data) => {    console.log(data);  };   return (    <form onSubmit={handleSubmit(onSubmit)}>      <input name="firstname" ref={register} /> {/* register an input */}            <input name="lastname" ref={register({ required: true })} />      {errors.lastname && 'Last name is required.'}            <input name="age" ref={register({ pattern: /\d+/ })} />      {errors.age && 'Please enter number for age.'}            <input type="submit" />    </form>  );}

import React, { useState } from 'react';
function Example() {
  // Declare a new state variable, which we'll call "count"  const [count, setCount] = useState(0);
  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

react hook from