Array#move: Move the first matched element in an array. Safely wraps and supports negative distances

gistfile1.rb

class Array
  def move(element, distance)
    current_pos = index(element)
    return self if current_pos.nil?
    new_pos = (current_pos+distance) - ((current_pos+distance)/length)*length
    delete(element)
    insert(new_pos, element)
  end
end