Hash

gistfile1.txt

ruby-1.9.2-head :001 > class C
ruby-1.9.2-head :002?>   def ==(o)
ruby-1.9.2-head :003?>     puts "==(0)"
ruby-1.9.2-head :004?>     super
ruby-1.9.2-head :005?>     end
ruby-1.9.2-head :006?>   def eql?(o)
ruby-1.9.2-head :007?>     puts "eql?(o)"
ruby-1.9.2-head :008?>     super
ruby-1.9.2-head :009?>     end
ruby-1.9.2-head :010?>   def hash
ruby-1.9.2-head :011?>     puts "hash"
ruby-1.9.2-head :012?>     1
ruby-1.9.2-head :013?>     end
ruby-1.9.2-head :014?>   end
 => nil 
ruby-1.9.2-head :015 > h = {}
 => {} 
ruby-1.9.2-head :016 > h[C.new] = 'blah'
hash
 => "blah" 
ruby-1.9.2-head :017 > h[C.new] 
hash
eql?(o)
 => nil 
ruby-1.9.2-head :018 >