function replaceChildren(element, newChildren) {
  removeChildren(element);
  addChildren(element, newChildren);
}

function addChildren(element, children) {
  for (let child of children) {
    element.appendChild(child);
  }
}

function removeChildren(element) {
  while (element.lastChild) {
    element.removeChild(element.lastChild);
  }
}

function round(val, places = 0) {
  return Math.round(val * Math.pow(10, places)) / Math.pow(10, places);
}