end
end
+ # Taken from Ruby backports:
# shuffle and shuffle! are defined in Ruby >= 1.8.7
- # This method returns a new array with the same items as
- # the receiver, but shuffled
- unless method_defined? :shuffle
- def shuffle
- sort_by { rand }
- end
- end
+ # This method returns a new array with the
+ # same items as the receiver, but shuffled
+ def shuffle
+ dup.shuffle!
+ end unless method_defined? :shuffle
- # This method shuffles the items in the array
- unless method_defined? :shuffle!
- def shuffle!
- replace shuffle
+ def shuffle!
+ size.times do |i|
+ r = i + Kernel.rand(size - i)
+ self[i], self[r] = self[r], self[i]
end
- end
+ self
+ end unless method_defined? :shuffle!
end
module ::Enumerable