try_chain.rb

class TryChain
  attr_reader :obj

  def initialize(obj)
    @obj = obj
  end

  def method_missing(sym,*args,&block)
    @obj = @obj.respond_to?(sym) ? @obj.send(sym,*args,&block) : nil
    self
  end
end

class Object
  def try(&block)
    maybe = TryChain.new(self)
    maybe = block.call(maybe)
    maybe.obj
  end
end

def test_try(obj)
  obj.try{|a| a.map(&:capitalize).map{|b| b + "x"} }
end

test_try ["a","b","cc"] #=> ["Ax","Bx","CCx"]
test_try nil #=> nil
test_try ["a","b",nil] #=> NoMethodError