react controller outside react component

example.js

const Controller = (function () {
  let currentRows = [];
  const addRow = function (newRow) {
    // add a new row to our local variable
    render();
  };
  const render = function () {
    ReactDOM.render(<Form onSubmit={addRow}/>, document.getElementById('myform'));
    ReactDOM.render(<Rows rows={currentRows}/>, document.getElementById('myrows'));
  };
  
  return {
    render: render
  };
})();

Controller.render();