Андрей Костяев

setValue(prevValue => (prevValue + number).slice(0, 3));

const myAppRoot = document.getElementById(“my-app”);
ReactDOM.render(<MyApp />, myAppRoot);

state = {
        inputEntry: '',
    }

handleInputChange = (e) => {
        this.setState({inputEntry: e.target.value})
    };

const Example = ({ disabled, onChange }) => {
  const [isActive, setIsActive] = useState(false);

  const handleClick = useCallback((e) => {
    e.stopPropagation();
    if (disabled) return;
    setIsActive(!isActive);
    onChange(!isActive);
  }, [isActive, disabled]);

  return <Switch onClick={handleClick} />;
};

class Main extends Component {
  render() {

    return (
      <article className="main">
        <div className="main-root">
          {this.props.counter.map(({ tag: Tag }, i) => <Tag key={i} />)}
        </div>
        <Edit/>
      </article>
    );
  }
}

stop(e) {
  e.stopPropagation();
}