gistfile1.js

function getDescendants(node, includeSelf) {
  var descendants = [],
      i, len;

  for (i = 0, len = node.children.length; i < len; ++i) {
    descendants = descendants.concat(getDescendants(node.children[i], true));
  }

  if (includeSelf) {
    descendants.push(node);
  }

  return descendants;
}