multi_send.rb

class Object
  def send_array(*messages)
    messages.reduce(self) { |obj, message| obj.send(*message) }
  end

  def send_hash(**messages)
    send_array(messages.map { |k, v| [k, *v] })
  end

  def multi_send(*messages)
    if messages.all? { |message| Hash === message }
      send_hash(*messages)
    else
      send_array(*messages)
    end
  end
end

5.multi_send(:days, :ago, :to_date, [:eql?, 5.days.ago.to_date]) 
# => true
5.multi_send( :+ => 5, :- => 8, eql?: 2) 
# => true