There can be one or many cows! how can you make them all eat their dinner?

cows.md

cows.rb

# = Cows!
# The Cows are created from this class
# 
class Cow
  def eats
    "munching grass"
  end
end

# = Many Cows
#
many_cows = []
3.times { many_cows << Cow.new }

# = One Cow
# 
one_cow = Cow.new

# # Dinner Time For the cows!
# But it could be either one, or many
# We don't know if they heard the bell or not!
# 
def dinner_time_for(one_or_many_cows)
  [one_or_many_cows].flatten.map(&:eat)
end