Discussion on: Building a Simple Virtual DOM from Scratch

Very good job. Thank you for a thorough guide!
Actually, there is a typo in your code within the post.

  const additionalPatches = [];
  for (const additionalVChild of newVChildren.slice(oldVChildren.length)) {
    additionalPatches.push($node => {
      $node.appendChild(render(newVChildren));
      return $node;
    });
  }

Inside the function that we put into additionalPatches we should render not the newVChildren but the additionalVChild.
This code appears in the first example in the explanation of diffChildren function.