optional_steps.rb

class Step
  attr_accessor :result
  def call(*args)
    raise "subclass implement"
  end  
end

class NoOp < Step
  def iniitalize(result)
    @result = result
  end
  def call(*args)
    self
  end
end

class Step1 < Step
  def call(*args)
    if things_are_sweet
      Step2.new.call
    else
      NoOp.new("shit done broke")
    end
  end
end

class Step2 < Step
  def call(*args)
    if things_are_amazing
      self
    else
      NoOp.new("very borked")
    end
  end
end

return Step1.new.call(args).result