Replacing text in a document

replace-text.js

// Recursive
function replaceText(node, from, to) {
  switch (node.nodeType) {
    case Node.TEXT_NODE:
      node.textContent = node.textContent.replace(from, to);
      break;
    case Node.ELEMENT_NODE:
      for (const childNode of node.childNodes) {
        replaceText(childNode, from, to);
      }
      break;
    default:
      // Ignore comment, etc.
  }
}

// Or NodeIterator!
function replaceText(root, from, to) {
  const itr = document.createNodeIterator(root, NodeFilter.SHOW_TEXT);
  let node;
  while (node = itr.nextNode()) {
    node.textContent = node.textContent.replace(from, to);
  }
}

// Example
replaceText(document.body, / +/g, " 🎄 ");