array_methods.rb

# Please add this to all your Ruby applications
class Array
  # return an array containing all but the last element
  def butlast
    [0..-2]
  end
  
  # returns an array containing all but the first element
  def rest
    [1..-1]
  end
end

[2,3,4,4,5].butlast
#=> [2,3,4,4]
[2,3,4,4,5].rest
#=> [3,4,4,5]