module ActiveSupport::Tryable

def try(*args, &block)
  if args.empty? && block_given?
    if block.arity == 0
      instance_eval(&block)
    else
      yield self
    end
  elsif respond_to?(args.first)
    public_send(*args, &block)
  end
end

def try!(*args, &block)
  if args.empty? && block_given?
    if block.arity == 0
      instance_eval(&block)
    else
      yield self
    end
  else
    public_send(*args, &block)
  end
end