nil-or example

nil_or.rb

# Creates an object you can savely traverse without getting nil.
# This is very pleasant for deep data-structures.
# You can punch the duck until it should become a string:
# NilOr.new(nil).what.the.fuck?.to_s --> nil
class NilOr
  
  def initialize(object, parent = nil)
    @object = object
    @call_stack = (parent ||  [])
    puts "current stack #{@call_stack}"
  end
  
  def method_missing(sym,*args, &block)
    ret = @object.send(sym, *args, &block) unless @object.nil?
    NilOr.new(ret, @call_stack.dup << sym)
  end
  
  def to_s
    @object.to_s
  end
  
end