Difference between '..' (double-dot) and '…' (triple-dot) in range generation?

Question

I\'ve just started learning Ruby and Ruby on Rails and came across validation code that uses ranges:

validates_inclusion_of :age, :in => 21..99
validates_         


        

Answer 1

.. and ... denote a range.

Just see it in irb:

ruby-1.9.2-p290 :032 > (1...2).each do puts "p" end
p
 => 1...2 
ruby-1.9.2-p290 :033 > (1..2).each do puts "p" end
p
p