Generator for depth first search of a tree node

dfs-generator.js

const dfsGenerator = function*( node ){
  const nodes = [ node ]

  while( nodes.length > 0 ){
    const current = nodes.pop()

    yield current

    let child = current.lastChild

    while( child ){
      nodes.push( child )
      child = child.previousSibling
    }
  }
}

dfs-iterator.js