react hook from

1import 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>  );}

1import React from 'react';
2import { useForm } from 'react-hook-form';
3import "./App.css";
4
5type Profile = {
6  firstname: string
7  lastname: string
8  age: number
9}
10
11function App() {
12  const {register, handleSubmit, errors} = useForm<Profile>()
13
14  const onSubmit = handleSubmit((data) => {
15    alert(JSON.stringify(data))
16  })
17
18  return (
19    <main>
20    <form onSubmit={onSubmit}>
21      <div>
22        <label htmlFor="firstname">First Name</label>
23        <input ref={register({ required: true })} id="firstname" name="firstname" type="text"/>
24        {
25          errors.firstname && <div className="error">Enter your name</div>
26        }
27      </div>
28      <div>
29        <label htmlFor="lastname">Last Name</label>
30        <input ref={register({ required: true })} id="lastname" name="lastname" type="text"/>
31        {
32          errors.lastname && <div className="error">Enter your last name</div>
33        }
34      </div>
35      <div>
36        <label htmlFor="age">Age</label>
37        <input ref={register({ required: true })} id="age" name="age" type="text"/>
38        {
39          errors.age && <div className="error">Enter your age</div>
40        }
41      </div>
42      <button type="submit">Save</button>
43    </form>
44    </main>
45  );
46}
47
48export default App;

1import React, { useState } from 'react';
2function Example() {
3  // Declare a new state variable, which we'll call "count"  const [count, setCount] = useState(0);
4  return (
5    <div>
6      <p>You clicked {count} times</p>
7      <button onClick={() => setCount(count + 1)}>
8        Click me
9      </button>
10    </div>
11  );
12}

1react hook from
2