demo of YAML deep dup trick

yaml_deep_dup

require 'yaml'

#the deep dup YAML cheat:

#nested arrays and hashes
complexity = [1, {:here => "is", :a => {:nested => "Hash!"}}, [ 2, 3, 4, [5, 6, 7]]]

p complexity

complex_yaml = complexity.to_yaml

p complex_yaml

new_complexity = YAML.load(complex_yaml)

new_complexity[1] = "CHANGED"

puts "Old version"
p complexity

puts "New version"
p new_complexity

#new_complexity is a new complete copy