Ruby Range examples

gistfile1.rb

1.9.3-p545 :001 > (1..2)
 => 1..2 
1.9.3-p545 :002 > (1..2).class
 => Range 
1.9.3-p545 :003 > (1..2).include?(1)
 => true 
1.9.3-p545 :004 > (1..2).include?(3)
 => false 
1.9.3-p545 :005 > 1..2.include?(3)
NoMethodError: undefined method `include?' for 2:Fixnum
	from (irb):5
	from /home/luke/.rvm/rubies/ruby-1.9.3-p545/bin/irb:12:in `<main>'
1.9.3-p545 :006 > 1 === 1..2
ArgumentError: bad value for range
	from (irb):6
	from /home/luke/.rvm/rubies/ruby-1.9.3-p545/bin/irb:12:in `<main>'
1.9.3-p545 :007 > 1 === (1..2)
 => false 
1.9.3-p545 :008 > 1 === (0..2)
 => false 
1.9.3-p545 :009 > (1..2) === 1
 => true 
1.9.3-p545 :010 > (1..2) === 3
 => false