print_from_one_to_ten.rb

# cf. http://www.slideshare.net/esehara/for-38276816

# 1
i = 1
while i <= 10 do
  puts i
  i += 1
end  

# 2
(1..10).each(&method(:puts))

# 3
def r(n = 1)
  puts n
  r(n + 1) unless n == 10
end
r

# 4
class Fixnum
  def r
    puts self
    (self + 1).r unless self == 10
  end
end
1.r

# 5
puts 1
puts 2
puts 3
puts 4
puts 5
puts 6
puts 7
puts 8
puts 9
puts 10