gistfile1.rb

class Array
  alias_method :_each, :each 
  def each(&block)
    cpy = Array.new(self)
    cpy.pop
    cpy._each{|n| block.call(n) }
  end
end

a = [1,2,3]

a.each do |num|
	puts num        # => 1,2
end

puts a.inspect 		# => puts [1, 2, 3]
puts a.reduce(:+) 	# => puts 3