Ivsath

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';

class Counter extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      count: 0
    };

Ivsath

import React from 'react'

function UsernameForm({onSubmitUsername}) {
  const [username, setUsername] = React.useState('')

  function handleSubmit(event) {
    event.preventDefault()
    onSubmitUsername(username)
  }