enumerable_skip.rb

module Enumerable
  # Skip the first n elements and return
  # an Enumerator for the rest, or pass them
  # in succession to the block, if given.
  def skip n
    if block_given?
      each do |x|
        if n > 0
          n -= 1
        else
          yield x
        end
      end
    else
      enum_for :skip, n
    end
  end
end