def each(&block)
      return enum_for(:each) unless block_given?

      child = first_child
      while child
        nextchild = child.next
        yield child
        child = nextchild
      end
    end
def each(&block)
      return enum_for(:each) unless block_given?

      child = first_child
      while child
        nextchild = child.next
        yield child
        child = nextchild
      end
    end
Public: Iterate over the children (if any) of the current pointer.