module ActiveSupport::Tryable

def try(method_name = nil, *args, &b)
  if method_name.nil? && block_given?
    if b.arity == 0
      instance_eval(&b)
    else
      yield self
    end
  elsif respond_to?(method_name)
    public_send(method_name, *args, &b)
  end
end

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